ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Borverbindungen, XXXI. Z/E-Substituierte Allylamine aus 1-Alkinen (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 395-401 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Boron Compounds, XXXI. Z/E-Substituted Allylamines from 1-AlkynesThe electrophilic addition of dimethylmethyleneammonium bromide to sodium trialkyl-1-propynylborates Na[R3BC≡CMe] [R=Me (1 a), Et (1 b)] gives Z/E-mixtures (ca. 1:1) of N-(3-dialkylboryl-2-methyl-3-alkylallyl)dimethylamines (2a, b) in 96% yield. The different behaviour of Z/E-2b on hydrolysis (preparation of subst. allylamine Z-3b) and on reactions with HCl-ether (isolation of 4 from Z-2b resp. of 5 and 6 from E-2b) and with NaH were investigated. E-3b is obtained from E-2b after transmetalation with triethylaluminium and subsequent hydrolysis. - The crystalline, betaine like ammonium borates 8a, b are formed by reaction of sodium triethyl(3-diethylamino-1-propynyl)borate (7) with dimethyl sulfate or triethyloxonium tetrafluoroborate.
    Notes: Durch elektrophile Addition von Dimethylmethylenammoniumbromid an Natrium-trialkyl-1-propinylborate Na[R3BC≡CMe] [R=Me (1a), Ät (1b)] erhält man mit 96% Ausbeute Z/E-Gemische (ca. 1:1) von N-(3-Dialkylboryl-2-methyl-3-alkylallyl)dimethylaminen (2a, b). Das unterschiedliche Verhalten von Z/E-2 b bei der Hydrolyse (Darstellung des subst.-Allylamins Z-3b) sowie bei Reaktionen mit HCI-Äther (Gewinnung von 4 aus Z-2b bzw. von 5 und 6 aus E-2b) und mit NaH wird untersucht. E-3b wird aus E-2b nach Ummetallieren mit Triäthylaluminium durch anschließende Hydrolyse gewonnen. - Natrium-triäthyl(3-diäthylamino-1-propinyl)borat (7) liefert mit Dimethylsulfat bzw. mit Triäthyloxonium-tetrafluoroborat die kristallinen, betainartigen Ammoniumborate 8a, b.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hydrated Oxocarbons, II. Preparation of a New Class of Thermochromic Boron Heterocycles from Octahydroxycyclobutane or Dihydroxybutenedioic Acid (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3332-3337 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydratisierte Oxokohlenwasserstoffe, II. Darstellung einer neuen Klasse von thermochromen Bor-Heterocyclen aus Octahydroxycyclobutan oder DihydroxybutendisäureDie Reaktion von Octahydroxycyclobutan (2) mit aktiviertem Triethylboran ergibt in geringer Ausbeute unter Ringaufspaltung von 2 das thermochrome 2,6-Diethyl-1,3,5,7-tetraoxa-2,6-dibora-4,8-octalindion (5b). 5b sowie andere Derivate dieser neuen Verbindungsklasse lassen sich aber in hohen Ausbeuten direkt aus Dihydroxyfumarsäure (6) mit verschiedenen Alkyl- oder Arylboranen herstellen. Mit Ausnahme der tert-Butyl- (5f) und der Aryl-Derivate 51, m verändern sämtliche Verbindungen 5, abhängig vom Substituenten, zwischen -5 und 150°C im Festkörper ihre Farbe reversibel von gelb nach farblos.
    Notes: The reaction of octahydroxycyclobutane (2) with activated triethylborane gives a low yield of the thermochromic 2,6-diethyl-1,3,5,7-tetraoxa-2,6-dibora-4,8-octalindione (5b) by ring cleavage of 2. Additional examples of this novel class of compounds have also been prepared directly by reacting dihydroxyfumaric acid (6) with various alkyl- or arylboranes. With the exception of the tert-butyl- (5f) and the aryl derivatives 51, m, the new compounds 5 undergo a temperature dependent colour change (yellow/colourless) in the solid state. The thermochromic transition temperature Tth depends on the substituents and lies between -5 and 150°C.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831161009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Borverbindungen, LIV. 17O-NMR-Untersuchungen an Organo-Bor-Sauerstoff-Cyclen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2022-2034 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Boron Compounds, LIV. 17O NMR Studies of Cyclic Organo-Boron-Oxygen Compounds17O-Chemical shifts (δ17O) of various cyclic organo-boron-oxygen compounds (borolanes, borinanes, 9-borabicyclo[3.3.1]nonanes, boroxins) are reported (Table 1). The δ17O values show that the magnetic screening of oxygen depends upon BO(pp)π-bonds. The contribution of the paramagnetic term σp to the screening (σ) of oxygen is evident from the comparison of δ17O of linear and bent systems, as is true for δ14N values of comparable compounds. Differences between 2-ethyl-1,3,2-dioxaborolanes and 2-ethyl-1,3,2-dioxaborinanes are shown by comparison of the δ17O data of the methyl substituted derivatives.
    Notes: 17O-Chemische Verschiebungen (δ17O) für verschiedene cyclische Organo-Bor-Sauerstoffverbindungen (Borolane, Borinane, 9-Borabicyclo[3.3.1]nonane, Boroxine) werden mitgeteilt (Tab. 1). Die δ17O-Werte belegen die Abhängigkeit der magnetischen Abschirmung des Sauerstoffs von BO(pp)π-Bindungen. Der Beitrag des paramagnetischen Terms σp zur Gesamtabschirmung (σ) wird durch Vergleich der δ17O-Werte linearer und gewinkelter Systeme deutlich, ebenso wie Parallelen zwischen δ17O und δ14N. Unterschiede zwischen 2-Ethyl-1,3,2-dioxaborolanen und 2-Ethyl-1,3,2-dioxaborinanen zeigen sich besonders bei den δ17O-Werten verschiedener methyl-substituierter Derivate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150603
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Hydrated oxocarbons, I. Preparation and reactions of tetrakis[organoboranediylbis(oxy)]cyclobutanes (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1336-1344 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydratisierte Oxokohlenwasserstoffe, I. Herstellung und Reaktionen von Tetrakis[organoborandiylbis(oxy)]cyclobutanenAus Octahydroxyclobutan (1) erhält man mit verschiedenen Monoorganoboranen in hohen Ausbeuten die Tetrakis[organoborandiylbis(oxy)]-Derivate 2a-d, die mit tertiären Aminen 1:2-sowie 1:4-Additionsverbindungen bilden. Bei der Alkoholyse lassen sich 2a-d in Abhängigkeit von den Organo-Substituenten an den Bor-Atomen partiell und vollständig entborylieren. Man erhält z. B. Tetraalkoxybis[phenylborandiylbis(oxy)]-Derivate des Cyclobutan-Rings (7b, c) oder, infolge Ringöffnung, Dihydroxyfumarsäure-dimethylester (5).
    Notes: Octahydroxycyclobutane (1) reacts with various monoorganoboranes to give in high yields the tetrakis[organoboranediylbis(oxy)] derivatives 2a-d. These react with tertiary amines to yield either 1:2 or 1:4 adducts. Depending on the organo substituents at the boron atoms, alcoholyses of 2a-d result in either partial or complete deborylation giving e.g. tetraalkoxybis[phenyl-boranediylbis(oxy)] derivatives of the cyclobutane ring (7b, c), or, with ring-opening, dimethyl dihydroxyfumarate (5).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160408
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The colour of chelates of boron. An X-ray structural investigation of bis(4-methylphenyl)boryl and 9-borabicyclo-[3.3.1]nonyl acetylacetonates (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 670-675 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Farbe von Bor-Chelaten. Röntgenstruktur-Untersuchung von Bis(4-methylphenyl)boryl- und 9-Borabicyclo[3.3.1]nonyl-acetylacetonatenDie Molekülstrukturen des farblosen Bis(4-methylphenyl)boryl- und des orangefarbenen 9-Borabicyclo[3.3.1]non-9-yl-acetylacetonats (4 und 5) wurden durch Röntgenstrukturanalyse ermittelt. Die C—O-Abstände in 4 sind merklich (ca. 0.029 Å) länger als die in 5. Es wird vermutet, daß der unterschiedliche π-Charakter in den C—O-Bindungen die Verschiebungen im Elektronenspektrum der verschiedenen Chelate von 1,3-Diketonen und verwandten Verbindungen verursacht.
    Notes: The molecular structures of the colourless bis(4-methylphenyl)boryl and the orange coloured 9-borabicyclo[3.3.1]non-9-yl acetylacetonates (4 and 5, respectively) have been determined by X-ray analysis. The C—O bond lengths in 4 are significantly (about 0.029 Å) longer than in 5. It is suggested that variation of the π bond order in the C—O bonds is responsible for the shifts in the electronic spectra observed for the various chelates of 1,3-diketones and related compounds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180226
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Übergangsmetall-π-Komplexe eines Hexaalkyl-Δ3-1,2,5-azasilaborolins (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 738-747 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metall-π-Complexes of a Hexaalkyl-Δ3-1,2,5-azasilaboroline4,5-Diethyl-1,2,2,3-tetramethyl-Δ3-1,2,5-azasilaboroline (1) acts as a 4π electron donor in different transition metal complexes. Reaction with Fe2(CO)9 leads to 1·Fe(CO)3 (2a), with (C5H5)Co(C2H4)2 to 1·Co(C5H5) (2b). The sandwich complex (1)2·Ni (3c) results from 1 with Ni(CDT) as well as by metal vapour synthesis from 1 with nickel atoms. Likewise metal vapour synthesis yields (1)2·Fe (3a), a paramagnetic 16 electron complex. Mass, 1H, 11B, and 13C NMR spectra are discussed. 2a was investigated by X-ray analysis.
    Notes: 4,5-Diethyl-1,2,2,3-tetramethyl-Δ3-1,2,5-azasilaborolin (1) kann in verschiedenen Übergangsmetallkomplexen als 4π-Elektronendonator fungieren. Mit Fe2(CO)9 bildet sich 1·Fe(CO)3 (2a), mit (C5H5)Co(C2H4)2 1· Co(C5H5) (2b). Der Sandwichkomplex (1)2·Ni (3c) entsteht sowohl aus 1 mit Ni(CDT) als auch durch Metallatomsynthese aus 1 mit Nickelatomen. Ebenfalls durch Metallatomsynthese gelingt die Herstellung von (1)2·Fe (3a), einem paramagnetischen 16-Elektronenkomplex. Die Massen-, 1H-, 11B- und 13C-NMR-Spektren werden diskutiert. 2a wurde röntgenstrukturanalytisch untersucht.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150234
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Herstellung von O-Diorganoboryl-Derivaten einiger (Organo)-Phosphor-Säuren (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2850-2862 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of O-Diorganoboryl Derivatives of Several (Organo)-Phosphorus Acids1)The O-diorganoboryl derivatives 4 - 9 of (organo)-phosphorus acids are prepared from diphenylphosphinic acid (1a), dicyclohexylphosphinic acid (1b), phenylphosphinic acid (1c), phenylphosphonic acid (2), and phosphoric acid (3) using activated triethylborane (method A), bis-9-borabicyclo[3.3.1]nonane (method B), or tetraethyldiboroxane (method C). By O-diorganoborylation, 1a  -  c give the compounds RR′P(O)OB(C2H5)2 [R = R′ = c-C6H11 (4b); R = C6H5, R′ = H (4c)], RR′P(O)OBC8H14 [R = R′ = C6H5 (5a); R = R′ = c-C6H11 (5b); R = C6H5, R′ = H (5c)], 2 reacts to form C6H5P(O)(OBR2)2 [R2 = (C2H5)2(6); R2 = C8H14 (7)], and 3 yields the compounds OP(OBR2)3 [R2 = (C2H5)2(8); R2 = C8H14 (9)].  -  The IR and MS data for 4 - 9, which associate in solution, are discussed.
    Notes: Die O-Diorganoboryl-Derivate 4 - 9 von (Organo)-Phosphor-Säuren werden aus Diphenylphosphinsäure (1a), Dicyclohexylphosphinsäure (1b), Phenylphosphinsäure (1c), Phenylphosphonsäure (2) und Phosphorsäure (3) mit aktiviertem Triethylboran (Methode A), Bis-9-borabicyclo[3.3.1]nonan (Methode B) oder mit Tetraethyldiboroxan (Methode C) hergestellt. Unter O-Diorganoborylierung erhält man aus 1a  -  c die Verbindungen RR′P(O)OB(C2H5)2 [R = R′ = C6H5 (4a); R = R′ = c-C6H11 (4b); R = C6H5, R′ = H (4c)], RR′P(O)OBC8H14[R = R′ = C6H5 (5a); R = R′ = c-C6H11 (5b); R = C6H5, R′ = H (5c)], aus 2 die Verbindungen C6H5P(O)(OBR2)2[R2 = (C2H5)2 (6); R2 = C8H14(7)] sowie aus 3 die Verbindungen OP(OBR2)3 [R2 = (C2H5)2 (8); R2 = C8H14 (9)].  -  Für die in Lösung assoziierten Verbindungen 4 - 9 werden IR- und MS-Daten angegeben.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170907
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Charakterisierung der dimeren Diorgano(organophosphinoyloxy)borane in Lösung und in festem Zustand (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2863-2874 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Characterization of the Dimeric Diorgano(organophosphinoyloxy)boranes in Solution and in Solid State1)The diorgano(phenylphosphinoyloxy)boranes R2BOP(O)C6H5R′ [1: R2 = (C2H5)2, R′ = C6H5; 2: R2 = C8H14 = 1,5-cyclooctanediyl, R′ = C6H5; 3: R2 = (C2H5)2, R′ = H; 4: R2 = C8H14, R′ = H] are characterized using NMR spectra (1H, 11B, 13C, 31P). In solution 1 - 4 exhibit monomer/dimer equilibria as a result of -P-O-B- coordination. (3)2 and (4)2 occur as cis/trans isomers. In the solid state the (POBO)2 eight-membered ring of (1)2 has a boat conformation, whereas that of the chiral (4)2 has a half-chair conformation (X-ray structure analyses).
    Notes: Die unter -P-O-B- Koordination im Monomeren/Dimeren-Gleichgewicht stehenden Diorgano(phenylphosphinoyloxy)borane R2BOP(O)C6H5R′ [1: R2 = (C2H5)2, R′ = C6H5; 2: R2 = C8H14 = 1,5-Cyclooctandiyl, R′ = C6H5; 3: R2 = (C2H5)2, R′ = H; 4: R2 = C8H14, R′ = H] werden in Lösung mittels der NMR-Spektren (1H, 11B, 13C, 31P) charakterisiert. (3)2 und (4)2 treten als cis/trans-Isomere auf. In festem Zustand bildet (1)2 einen (POBO)2-Achtring mit Wannen-Struktur, während das chirale (4)2 als (POBO)2-Achtring mit Halbsessel-Konformation vorliegt (Röntgenstrukturanalysen).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170908
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Neuartig chelatisierte Organodiboroxane und Organoboroxine aus Triorganoboroxinen und enolisierbaren 1,3-Diketonen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1931-1952 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel Chelated Organodiboroxanes and Organoboroxins from Triorganoboroxins and Enolizable 1,3-DiketonesTrialkylboroxins (RBO)3 (1) [1a: R=CH3; 1b: R=C2H5] react with enolizable 1,3-diketones (R′CO)2CH2 [2a: R′=CH3; 2b: R′=C6H5] at ≈ 20°C with fast degradation of the boroxin rings to give the monochelated diboroxanes 3 of the composition HOB(R)OB(R)OC(R′)CHC(R′)O [3aa: R=R′=CH3; 3ba: R=C2H5, R′=CH3; 3bb: R=C2H5, R′=C6H5] in yields up to 85%. The solid 3 with H-bridged bicyclic structures are in equilibrium with partially ring opened compounds in solution (1H, 11B, 13C, and 17O NMR data). From 1b with 2a or from triphenylboroxin (1c) with 2b the double chelated diboroxanes [RB(R′CO)2CH]2O [4ba: R=C2H5, R′=CH3; 4cb: R=R′=C6H5] are obtained. 1c reacts with 2a or 2b at 〉 140°C under slow protolysis of the B-phenyl residues to form the single and double chelated boroxins 5 and 6 having the compositions R2B3O3(R′CO)2CH [5ca: R=C6H5, R′=CH3; 5cb: R=R′=C6H5] and RB3O3[(R′CO)2CH]2 [6cb. R=R′=C6H5].  -  4, 5, and 6 with fully or partially chelated boron atoms are stable up to 〉 200°C.  -  The molecular structures of 4cb and 5ca were determined by X-ray analyses.
    Notes: Aus Trialkylboroxinen (RBO)3 (1) [1a: R=CH3; 1b: R=C2H5] bilden sich bei ≈ 20°C mit enolisierbaren 1,3-Diketonen (R′CO)2CH2 [2a: R′=CH3; 2b: R′=C6H5] unter raschem Abbau der Boroxin-Ringe in bis zu 85proz. Ausbeute die monochelatisierten Diboroxane 3 der Zusammensetzung HOB(R)OB(R)OC(R′)CHC(R′)O [3aa: R=R′=CH3; 3ba: R=C2H5, R′=CH3; 3bb: R=C2H5, R′=C6H5]. Die festen 3 mit H-verbrückter bicyclischer Struktur stehen in Lösung im Gleichgewicht mit partiell ringgeöffneten Verbindungen (1H-, 11B-, 13C- und 17O-NMR-Daten). Aus 1b erhält man mit 2a und aus Triphenylboroxin (1c) mit 2b die zweifach chelatisierten Diboroxane [RB(R′CO)2CH]2O [4ba: R=C2H5, R′=CH3; 4cb: R=R′=C6H5]. 1c reagiert mit 2a oder 2b bei 〉 140°C unter langsamer Protolyse der B-Phenylreste zu den einfach und zweifach chelatisierten Boroxinen 5 und 6 mit den Zusammensetzungen R2B3O3(R′CO)2CH [5ca: R=C6H5, R′=CH3; 5cb: R=R′=C6H5] und RB3O3[(R′CO)2CH]2 [6cb: R=R′=C6H5]. 4, 5 und 6 mit vollständig bzw. partiell chelatisierten Bor-Atomen sind bis 〉 200°C stabil.  -  Die Molekülstrukturen von 4cb und 5ca wurden durch Röntgenstrahlbeugungsanalysen bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190615
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Borverbindungen, L Diethyl(substit.-vinylamino)borane aus Triethylboran und N-Alkylketiminen (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 734-747 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Boron Compounds, L1).  -  Diethyl(substituted-vinylamino)boranes from Triethylborane and N-AlkylketiminesN-Alkylketimines 1 react with activated triethylborane above 70°C with liberation of 1 mol ethane to yield 81-97% diethyl(substit.-vinylamino)boranes 2 [H5C2)2BN(R1)-C(CH2R2) = CHR3]. (Z)-2b2 [R1 = CH(CH3)2, R2 = H, R3 = CH3] can be enriched to more than 80% of 2b mixture by addition of 2b1 [R1 = CH(CH3)2, R2 = CH3, R3 = H] and (E)-2b2 to benzaldehyde.
    Notes: Aus N-Alkylketiminen 1 erhält man mit aktiviertem Triethylboran oberhalb 70°C unter Abspaltung von 1 mol Ethan regio- sowie stereoisomere (Z/E)-Diethyl(substit.-vinylamino)borane 2 [(H5C2)2BN(R1)-C(CH2R2) = CHR3] in 81- bis 97proz. Ausbeute. (Z)-2b2 [R1 = CH(CH3)2, R2 = H, R3 = CH3] läβt sich aus dem 2b-Isomerengemisch durch Addition von 2b1 [R1 = CH(CH3)2, R2 = CH3, R3 = H] und (E)- 2b2 an Benzaldehyd auf über 80% anreichern.
    Additional Material: 11 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810419
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...