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
Filter
  • Chemistry  (96)
  • Carbonyl complexes  (2)
  • 11
    Electronic Resource
    Electronic Resource
    Reaction of 1,3-Dialkyl-4,5-dimethylimidazol-2-ylidenes with 2-Bromo-2,3-dihydro-1H-1,3,2-diazaboroles (Alkyl=iPr and tBu)Dedicated to professor Adolf Zschunke on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 705-710 
    Details
    ISSN: 0009-2940
    Keywords: Boron ; Diazaboroles ; Carbenes ; Heterocycles ; Imidazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Bromo-2,3-dihydro-1H-1,3,2-diazaboroles (3a-c) were synthesized by cyclocondensation of dilithiated 1,4-diazabutadienes (5a-c) with boron tribromide in hexane. 3a was also obtained by sodium amalgam reduction was conducted in ether solvents, diboroxane (2) resulted as the main product. Compound 3a and 1,3-dialkyl-4,5-dimethylimidazol2-ylidenes (6a, b) underwent halide displacement to afford the borolylimidazolium salts 7a, b. Compounds 2, 3a-c, and 7a, b were characterized by elemental analyses and spectroscopic methods (1H, 11B, 13C NMR; Ir; MS). The molecular structures of 2 and 7a were established by single-crystal X-ray diffraction analyses.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300606
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Transition-Metal-Substituted Acylphosphanes and Phosphaalkenes, 35 Unprecedented Coupling of a Transition-Metal Carbyne and a Methylene Phosphane Moiety - Structure of [Tp'(CO)2W=CP=C(NEt2)2] [Tp = HB (3,5-Me2HC3N2)3] (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1305-1308 
    Details
    ISSN: 0009-2940
    Keywords: Carbyne complexes ; Phosphaalkenes ; Molybdenum ; Tungsten ; . interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Condensation of [Tp](CO)2 Mčl] [1: M = Mo; 2: W; Tp] HB (3,5-Me2HC2N2)3] with the inverse phosphaalkenes Me3 Sip=C(NR2)2 (3a: R = Me; 3b: Et) affords the novel phosphaalkenyl carbyne complexes [Tp](CO)2M.C-P=C(NR2)2] (a, b) (M = Mo; R = Me, Et) and 5a, b (M = W; R = Me, Et), which have been characterized by IR, 1H-, 13C- and 31P-NMR spectroscopy. In additon, the molecular structure of 5 has been elucidated by a single-crystal X-ray structure determination.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300920
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Kinetische und mechanistische Untersuchungen von Übergangsmetall-Komplex-Reaktionen, XV. Übergangsmetall-Schwefelylid-Komplexe, XX. Reaktionskinetischer Nachweis von [(CO)5Cr=CH2] bei der Umsetzung von Pentacarbonyl[(dimethyloxosulfonio)methanid]-chrom(0) mit tertiären Phosphanen (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 3340-3347 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, XV1). Transition Metal Sulfur Ylide Complexes, XX2). Kinetic Evidence of [(CO)5Cr=CH2] in the Reaction of Pentacarbonyl[(dimethyloxosulfonio)-methanide]chromium(0) with Tertiary PhosphanesPentacarbonyl[(dimethyloxosulfonio)methanide]chromium(0), (CO)5Cr[CH2S(O)Me2] (1), reacts with tertiary phosphanes PR3 (2) (R = Ph, C6H4OMe-(p), C6H4Me-(p), C6H4Cl-(p)) to give pentacarbonyl(phosphonium ylide)chromium(0) complexes, (CO)5Cr[CH2PR3] (3), and dimethyl sulfoxide according to the first-order rate law. The reaction rate is independent on the type of the phosphane. The activation parameters for the reaction in 1,1,2-trichloroethane in the temperature range 39.6 to 68.0°C are ΔH≠ = 28.1 kcal · mol-1 and ΔS≠ = 12.7 cal · mol-1 · K-1. The reaction is initiated by irreversible dissociation of OSMe2 from 1. Addition of 2 to the carbene carbon of the resulting pentacarbonylmethylenechromium, [(CO)5Cr=CH2], yields 3 in a fast succeeding step. A mechanism involving rate determining dissociation of the Cr=CH2 bond can be excluded. These results represent the first evidence of a neutral, electrophilic carbonylmethylene complex.
    Notes: Pentacarbonyl[(dimethyloxosulfonio)methanid]chrom(0), (CO)5Cr[CH2S(O)Me2] (1), reagiert mit tertiären Phosphanen PR3 (2) (R = Ph, C6H4OMe-(p), C6H4Me-(p), C6H4Cl-(p)) nach dem Geschwindigkeitsgesetz erster Ordnung zu Pentacarbonyl(phosphorylid)chrom(0)-Komplexen, (CO)5Cr[CH2PR3] (3), und Dimethylsulfoxid. Die Reaktionsgeschwindigkeit ist von der Art des Phosphans unabhängig. Die Aktivierungsparameter für die Reaktion in 1,1,2-Trichlorethan im Temperaturbereich von 39.6-68.0°C sind ΔH≠ = 28.1 kcal · mol-1 und ΔS≠ = 12.7 cal · mol-1. K-1. Die Reaktion wird durch irreversible Dissoziation von OSMe2 vom Komplex 1 eingeleitet. An das Carbenkohlenstoffatom des resultierenden Pentacarbonylmethylenchroms, [(CO)5Cr=CH2], addiert sich dann 2 in einem raschen Folgeschritt unter Bildung von 3. Ein Mechanismus über einen geschwindigkeitsbestimmenden Cr-CH2-Bindungsbruch kann ausgeschlossen werden. Diese Ergebnisse sind der erste Nachweis eines neutralen elektrophilen Carbonylmethylen-Komplexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841171203
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Schwefelylid-Komplexe, XVI. 1-Methyl-3,5-diorganylthiabenzol-1-oxid-Komplexe: Ein Beitrag zur Synthese und Stereochemie (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1327-1335 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Sulfur Ylide Complexes, XVI. 1-Methyl-3,5-diorganylthiabenzene 1-Oxide Complexes: Synthesis and StereochemistryFrom the reaction of (CH3CN)3M(CO)3(M = Cr, Mo, W) with thiabenzene oxides 1b-d complexes such as (thiabenzene oxide)M(CO)3 are isolated. Isomers are only obtained for chromium. Employing di-tert-butyl derivative 1e as a ligand a different situation is encountered. Here, only the anti-isomeric chromium complex 5e is formed. On the other hand with molybdenum and tungsten syn- and anti-configurated complexes are obtained.
    Notes: Bei der Reaktion von (CH3CN)3M(CO)3(M = Cr, Mo, W) mit den Thiabenzoloxiden 1b-d werden Komplexe des Typs (Thiabenzoloxid)M(CO)3 gebildet. Isomere werden jedoch nur für das Chrom erhalten. Mit dem Di-tert-butylderivat 1e als Liganden werden dagegen andere Verhältnisse angetroffen. Hier entsteht allein der anti-isomere Chromkomplex 5e, dafür werden aber für Molybdän und Wolfram syn- und anti-konfigurierte Komplexe gebildet.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160407
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Übergangsmetallkomplexe instabiler Ylide, II1). Koordinationschemische Stabilisierung von phosphino- und arsinomethylsubstituierten Phosphonium- bzw. Arsoniummethyliden an Tetracarbonylchrom (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 732-742 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Complexes of Instable Ylides, II1). Stabilization of Phosphino- and Arsinomethyl-substituted Phosphonium- and Arsonium Ylides by Coordination to TetracarbonylchromiumThe sulfur ylide complexes (CO)5Cr[CH2S(O)Me2] (1) and (CO)4Cr[CH2S(O)Me2]2 (7) react with symmetrically substituted ditertiary phosphanes or arsanes such as 5 to yield five-membered metallacycles (6), in which the ylides CH2 = ER21 - ER21 - CR22 - ER21 (E = P, As) are incorporated as chelate ligands. The free ylidic ligands are not stable. The structures of 6 are elucidated by means of IR, 1H and 31P. NMR spectroscopy as well as by an X-ray structure analysis of 6f.
    Notes: Die Schwefelylidkomplexe (CO)5Cr[CH2S(O)Me2] (1) und (CO)4Cr[CH2S(O)Me2]2 (7) reagieren mit den symmetrischen ditertiären Phosphanen und Arsanen 5 zu den fünfgliedrigen Metallacylen 6, welche die im freien Zustand nicht beständigen Ylide H2C = ER21 - CR22 - ER21 (E = P, As) als Chelatliganden tragen. Die Strukturen von 6 werden durch IR-, 1H- und 31P-NMR-Spektren sowie durch die Röntgenstrukturanalyse des Arsenylidkomplexes 6f ermittelt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170226
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Übergangsmetallkomplexe instabiler Ylide, III. Präparative, stereochemische und mechanistische Aspekte bei der koordinationschemischen Stabilisierung instabiler Ylid-Chelatliganden (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1103-1112 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Complexes of Instable Ylides, III1). Preparative, Stereochemical, and Mechanistic Aspects of the Stabilization of Instable Ylidic Chelate Ligands by Coordination to ChromiumThe sulfur ylide complex (CO)5Cr[CH2S(O)Me2] (1) reacts with unsymmetrically substituted diphosphanes and arsanes of the type R12E1CH2E2R22 (4a - d) to give regioselectively the chelate complexes 5a - d. In 5 the more nucleophilic end of 4 is transformed to the onium centre. On the other hand, (CO)4Cr[CH2S(O)Me2]2 (2) and 4a - d produce regioselectively the isomeric chelate complexes 6a - d, in which the more nucleophilic donor function of 4 is ligated to the chromium atom.
    Notes: Der Schwefelylid-Komplex (CO)5Cr[CH2S(O)Me2] (1) bildet mit den unsymmetrisch substituierten Diphosphanen bzw. Arsanen R12E1CH2E2R22 (4a - d) regioselektiv die Chelatkomplexe 5a - d, bei denen das stärker nucleophile Ende von 4 als Oniumfunktion auftritt. Demgegenüber reagiert (CO)4Cr[CH2S(O)Me2]2 (2) mit 4a - d regioselektiv zu den isomeren Chelatkomplexen 6a - d, in denen die stärker nucleophile Donorfunktion von 4 am Chromatom gebunden ist.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170325
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Übergangsmetall-funktionalisierte Phosphaarsene als Liganden in Pentacarbonylchrom-Komplexen. Röntgenstrukturanalyse von (η5-C5Me5)(CO)2Fe-As[Cr(CO)5] = P-C6H2(tBu)3(2,4,6) (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 1535-1539 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal-Functionalized Phosphaarsenes as Ligands in Pentacarbonylchromium Complexes. X-Ray Structure Analysis of (η5-C5Me5)(CO)2Fe - As[Cr(CO)5]= P-C6H2(tBu3)(2,4,6)The reaction of photochemically generated [(Z)-cyclooctene]-Cr(CO)5 with the transition-metal substituted phosphaarsenes (η5-C5H4R)(CO)(PPh3)Fe—As=P—Ar (2a, b) (Ar = 2,4,6-tBu3-C6H2; R = H, Me) affords the deep-red compounds (η5-C5H4R)(CO)(PPh3)Fe—As[Cr(CO)5]=P—Ar (3a, b). Thermolabile (η5-C5Me5)(CO)2Fe—As=P—Ar (4) was trapped as the Cr(CO)5 adduct 5 by treatment with [(Z)-cyclooctene]Cr(CO)5. The molecular structure of complex 5 was established by single crystal X-ray diffraction analysis.
    Notes: Die Umsetzung von photochemisch erzeugtem [(Z)-Cycloocten]Cr(CO)5 mit den Übergangsmetall-substituierten Phosphaarsenen (η5-C5H4R)(CO)(PPh3)Fe—As=P—Ar (2a, b) (Ar = 2,4,6-tBu3C6H2; R = H, Me) liefert die tiefroten Verbindungen (η5-C5H4R)(CO)(PPh3)Fe—As[Cr(CO)5]=P—Ar (3a, b). Des weiteren wurde in situ gebildetes und thermolabiles (η5-C5Me5)(CO)2-Fe—As=P—Ar (4) aus der Reaktionslösung mit [(Z)-Cycloocten]Cr(CO)5 als Cr(CO)5-Komplex 5 abgefangen. Die Aufklärung von 5 erfolgte mittels Röntgenstrukturanalyse.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881210902
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Schwefelylid-Komplexe, XXVI. Zur Reaktivität des (1,3-Diphospha-2-propanon)eisen-Komplexes Fe2(CO)6[(iPr)2N - PC(O)P - N(iPr)2] mit den Yliden Me2S(O)CH2 und Ph3PCH2. Synthese und Struktur von Fe2(CO)6{[(iPr)2N - PCH2]2CO} (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 809-813 
    Details
    ISSN: 0009-2940
    Keywords: 1,3-Diphospha-2-propanone, iron complex of ; Methylene insertion ; Ylides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Sulfur Ylide Complexes, XXVI. - Reactivity of the (1,3-Diphospha-2-propanone)iron Complex Fe2(CO)6-[(iPr)2N-PC(O)P-N(iPr)2] towards the Ylides Me2S(O)CH2 and Ph3PCH2. Synthesis and Structure of Fe2(CO)6{[(iPr)2N-PCH2]2CO}The metal-functionalized 1,3-diphospha-2-propanone Fe2(CO)6-[(iPr)2N-PC(O)P-N(iPr)2] (3) reacts with two equivalents of Me2S(O)CH2 to give the 1,5-diphospha-3-pentanone derivative 6 by insertion of one CH2 group into each P—C(O) bond. Treatment of 3 with Ph3PCH2 affords the carbonyl-stabilized phosphorus ylide 8. The molecular structure of 6 is established by X-ray analysis. Structure elucidation of 8 is based on spectroscopic data (IR, 1H-, 13C-, 31P-NMR, MS).
    Notes: Das metallierte 1,3-Diphospha-2-propanon Fe2(CO)6[(iPr)2N-PC(O)P-N(iPr)2] (3) reagiert mit zwei Äquivalenten Me2S(O)-CH2 unter Insertion jeweils einer CH2-Gruppe in beide P—C(O)-Bindungen zu dem 1,5-Diphospha-3-pentanon-Derivat 6. Die Behandlung von 3 mit Ph3PCH2 liefert das carbonylstabilisierte Phosphorylid 8. Von 6 wurde eine Röntgenstrukturanalyse durch-geführt. Strukturaufklärung von 8 erfolgte spektroskopisch (IR, 1H-, 13C-, 31P-NMR, MS).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220503
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XV. Zur Umsetzung des Phosphaallylkomplexes (η5-C5Me5)(CO)Fe-{η3-P[CH(SiMe3)2](CHC=O)} mit Chalcogenen und Fe2(CO)9 (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 989-996 
    Details
    ISSN: 0009-2940
    Keywords: Phosphaallyl complexes ; Chalcogenes ; Düron, enneacarbonyl ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Acylphosphanes and Phosphaalkenes, XV. - Reaction of the Phosphaallyl Complex (η5-C5Me5)(CO)Fe{η3-P[CH(SiMe33)2](CHC=O}} with Chalcogenes as well as with Fe2(CO)9The (η3-phoshaalyl)iron complex (η5-C5Me5)(CO)Fe{η3-P(CH(SiMe3)2](CHC=O)} (1) is oxidized by sulfur and selenium to afford the methylenethioxo- and methyleneselenoxophosphorane complexes 4 and 5 with an anti-configuration of the CH(SiMe3)2 substituent relative to iron. The chalcogene atoms are attached to the phosphorus atom of the ligand and do not participate in the bonding to the metal Equivalent amounts of 1 and Fe2(CO)9 lead to the phosphaalkenyl complex 6 with an Fe - C σ bond. On the other hand, a large excess of Fe2(CO)9 converts 1 as well as 6 into the cluster compound 7 featuring the bridging 1-oxa-4-phosphabutadiene ligand (η5-C2Me5)(CO)2Fe - C(O) - CH=P - CH(SiMe3)2. Constitution and configuration of all compounds have been elucidated by spectroscopic methods (IR, 1H, 13C, 31P NMR, and MS). In addition complexes 5 and 7 have been characterized by single crystal X-ray diffraction analyses.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240504
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Umlagerungsreaktionen von Metallodiphosphapropenen des Typs (η5-C5Me5)(CO)2FeP(SiMe3)  -  P = C(R)(SiMe3) (R = SiMe3, Ph)Herrn Professor Heinrich Nöth zum 65. Geburtstag gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1963-1968 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphapropenes ; CH insertion ; Diphosphiranes ; Chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rearrangements of the Metallodiphosphapropenes (η5-C5Me5)(CO)2FeP(SiMe3  -  P = C(R)(SiMe3) (R = SiMe3, Ph)Heating of a methylcyclohexane solution of (η5-C5Me5)-(CO)2FeP(SiMe3)  -  P = C(SiMe3)2 (1a) gives rise to the insertion of the P = C moiety into the CH bond of a ring methyl group with formation of the chelate complex η5-ηC5Me4CH2P-[CH(SiMe3)2]P(SiMe3)Fe(CO)2 (2) which is converted into the pentacarbonylchromium derivative [5-C5Me4CH2P[CH-(SiMe3)2]P(SiMe3)[Cr(CO)5]Fe(CO)2] (3). In contrast, a similar treatment of (5-C5Me5)(CO)2FeP(SiMe3)  -  P = C(Ph)(SiMe3) (1 b) furnishes the diphosphirane (5-C5Me5)(CO)2FeP  -  C(Ph)-SiMe3)  -  P (SiMe3) (5). By chromatography of its (CO)5Cr adduct 6, the P  -  Si bond is hydrolyzed to give the (diphosphirane)-chromium complex [(5-C5Me5)(CO)2FeP-C(Ph)(SiMe3)P(H)]-Cr(CO)5 (8). The molecular structures of 3 and 8 are determined by single-crystal X-ray analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260902
    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...