ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 745-748 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 355-358 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 5-Arylamino-3-bromo-1,2,4-thiadiazoles and 5-Arylamino-3-bromo-isothiazoles
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 328-332 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of 1, 1-Dimethylthio- and 1-Dimethylamino-2-nitroethene with Malononitrile Dimer
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 206-213 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New Synthesis of Substituted 4-Amino-quinazolines and Their HeteroanalogaN-Chloracetyl-anthranilonitriles react with potassium thiocyanate in the presence of alcohol to the (4-aminoquinazolin-2-yl-thio)-acetic acid ester (5). In the presence of water or primary amine the acetic acid derivative (6) or the acetic acid amide derivatives (7) are obtained. 2,4-Diaminoquinazolines (8) arise if vigorous reaction conditions are employed. With 2-chloracetylamino-cyclopent-1-en-carbonitrile as starting material the pyrimidines (11) are formed from the reaction with potassium thiocyanate. Analogously, (4-pyrimidyl-2-yl-seleno)-acetic acid ester (12) and (thiazolo[4,5-d]pyrimid-2-yl-seleno)-acetic acid derivatives (16) can be prepared with potassium selenocyanate. N-Chloracetyl derivatives of 5-membered heterocycles with enamino-nitrile structure (13, 15, 18, 20) react with potassium thiocyanate to yield thieno[2,3-d]-, thiazolo[4,5-d]-, pyrrolo[2,3-d]-, furo[2,3-d]- and pyrazolo[4,3-d]pyrimidines (14, 16, 19a, 19b, 21).
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 516-522 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Reactions of 2-Mercapto-6-thioxo-thiopyran-3-carboxylate derivatives6-Amino-thiopyran-2-thiones (1) react with dihydrogen sulfide in the presence of pyridine and triethyl amine to yield 6-thioxo-thiopyran-2-thiolates (2). Methylation of 2 gives the methylthio compounds 3 and 4. Further methylation of 3a and 4a yields the thiapyrylium salt (7). The reaction of 2-imino-thiopyran (6) with carbon disulfide represents another route to the 6-methylthio-thiopyran-2-thione (4a). The 2-methylthio-thiopyran-6-thione (3a) undergoes substitution of the methylthio group with amines to 8 or reacts with phenylhydrazine to phenylhydrazono-thiopyrane (9c). 6-Thioxo-thiophen-2-thiolates (2a,b) react with hydrazine hydrate to give hydrazono-thiopyranes (10a,b) which can be S-methylated. On the contrary 2c gives with hydrazine hydrate under ring transformation the pyridine-2-thiolate (11). N,S-Acetals (12) and 1,3,4-thiadiazoles (15), which give rise to new pyridine derivatives (14) and (17), can be obtained from 1-Amino-pyridin-2-thiolate (11).
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 472-477 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Amino-thieno[2,3-c]pyrazoles and Amino-thieno[2,3-b]pyrrolesThe synthesis of thieno[2,3-c]pyrazoles and thieno[2,3-b]pyrroles is described. From the dithioliumsalt (1) and potassium hydroxide the potassium-(2,2-dicyan-1-methylthio-ethen-1-yl)-thiolate (2) is formed. This reacts with hydrazine hydrate to form the 3-amino-5-thioxo-pyrazol-4-carbonitrile (3) S-Alkylation with α-chlorocarbonyl compounds yielding (6a-c) leads via Thorpe-Ziegler-cyclization to 3,4-diamino-thieno[2,3-c]pyrazoles (9) if the position 1 is alkylated (8). Acetyl acetone yields 2-mercapto-pyrazolo[1,5-a]pyrimidine (5). After S-alkylation (10a-d) are immediately cyclized to thieno [2′,3′:3,4]pyrazolo[1,5-a]pyrimidine (11a-d). The ketone (6a) can be cyclized to the pyrazolo [5,1-b]thiazole (12). 3 reacts with oxalyl chloride to form the 2,3-dioxo-6-thioxo-imidazo[1,2-b]pyrazole (13) of which S-phenacyl derivative (14) because the NH-proton cannot be cyclized. The 5-amino-3,4-dicyano-pyrrol-2-thiolate (16) shows the analogous behaviour. The S-alkylation is followed by cyclization, and 3,5-diamino-thieno[2,3-b]pyrroles (18a-b) arise. Reaction of 5-amino-2-alkylthio-pyrrol-3,5-dicarbonitrile (17) with acetyl acetone provides pyrrolo[1,2-a]pyrimidine (20a-c) which can be cyclized to form thieno[3′,2′:4,6]pyrimidines (21a-c) very easily.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 878-883 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclizations with Arylhydrazono-malononitriles
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 557 (1988), S. 45-58 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Phosphido Complexes. XV. (DRPE)Ni-Complexes with PH-Containing, η2-Coordinated Diphosphene Ligands and the Diphosphorus Complexes [(DRPE)Ni]2P2The complexes (DRPE)NiCl2 1 (DRPE = R2PCH2CH2PR2; R = Et: DEPE a; R = Cy: DCPE b; R = Ph: DPPE c) react with the silylphosphines (Me3Si)3P, (Me3Si)2PH, Me3SiPH2 and [(Me3Si)2P]2 to form the diphosphorus complexes [(DRPE)Ni]2P2 3a-c and the nickel(0) complexes (DRPE)2Ni 4a-c. In the reaction of 1b with Me3SiPH2 the P2H2 complex (DCPE)Ni[η2-(PH)2] 5b can be isolated at low temperature as an intermediate. Cleaving the Si—P bonds in (DRPE)Ni[η2-(PSiMe3)2] 2a, 2b with CH3OH gives also the P2 complexes 3a, 3b. Intermediates containing HP=PSiMe3 and P2H2 as ligands can be detected nmr spectroscopically. Reacting 1a-c with (Me3Si)2PP(SiMe3)CMe3 the complexes (DRPE)Ni(η2-Me3SiP=PCMe3) 7a-c containing asymmetric diphosphene ligands can be obtained. 7a reacts with CH3OH yielding the P2 complex 3a directly, while 7b with CH3OH first gives (DCPE)Ni(η2-HP=PCMe3) 8b. In solution 8b can be transformed into 3b upon heating to 80°C. N.m.r. and mass spectral data are reported.
    Notes: Die Komplexe (DRPE)NiCl2 1 (DRPE = R2PCH2CH2PR2; R = Et: DEPE a; R = Cy: DCPE b; R = Ph: DPPE c) reagieren mit den Silylphosphanen (Me3Si)3P, (Me3Si)2PH, Me3SiPH2 und [(Me3Si)2P]2 unter Bildung der Diphosphorkomplexe [(DRPE)Ni]2P2 3a-c und der Nickel(0)-Komplexe (DRPE)2Ni 4a-c. Bei der Umsetzung von 1 b mit Me3SiPH2 läßt sich der P2H2-Komplex (DCPE)Ni[η2-(PH)2] 5 b bei tiefen Temperaturen als Zwischenprodukt isolieren. Die Spaltung der Si—P-Bindungen in (DRPE)Ni[η2-(PSiMe3)2] 2a, 2b mit CH3OH führt über NMR-spektroskopisch nachweisbare Komplexe mit HP = PSiMe3- und P2H2-Liganden ebenfalls zu den P2-Komplexen 3a, 3b. Durch Umsetzungen von 1a-c mit (Me3Si)2PP(SiMe3)CMe3 sind (DRPE)Ni(η2-Me3SiP=PCMe3) 7a-c mit asymmetrischen Diphosphenliganden zugänglich. 7a reagiert mit CH3OH direkt zum P2-Komplex 3a, während 7b mit CH3OH zunächst (DCPE)Ni(η2-HP=PCMe3) 8b ergibt, das in Lösung bei 80°C zu 3b weiterreagiert. NMR-spektroskopische und massenspektrometrische Daten werden mitgeteilt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 557 (1988), S. 59-68 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Phosphido Complexes. XVI. Structures of two Open-Chain, PH2-Bridged Bimetallic Complexes cp(CO)2Fe(μ-PH2)MLn (MLn = Fe(CO)4, MnMecp(CO)2)cp(CO)2Fe(μ-PH2)Fe(CO)4 1 crystallizes monoclinic in the space group P21/c with a = 733.6 pm, b = 1089.8 pm, c = 1761.6 pm, β = 99.65°, and Z = 4 formula units. The bond distances of the bridging phosphorus atom to the two iron units Fe(1)(CO)4 and cp(CO)2Fe(2) differ with 229.0 pm (P—Fe(1)) and 226.5 pm (P—Fe(2)), respectively, only slightly. The angle Fe(1)—P—Fe(2) is with 124.8° surprisingly large for four-coordinate phosphorus. The coordination at Fe(1) is trigonal bipyramidal with axial phosphorus. The ligand sphere at Fe(2) corresponds to the so-called “piano stool” arrangement.cp(CO)2Fe(μ-PH2)MnMecp(CO)2 2 crystallizes monoclinic in the space group P21 with a = 750.1 pm, b = 2234.5 pm, c = 974.1 pm, β = 106.23°, and Z = 4 formula units. The P—Fe bond distance is found to be 230.0 pm, the P—Mn bond distance 224.3 pm. The angle Fe—P—Mn is with 126.8° even somewhat larger than the corresponding angle in 1. Including the bridging PH2-group both transition metals of 2 achieve a kind of “piano stool” arrangement for their ligand sphere.
    Notes: cp(CO)2Fe(μ-PH2)Fe(CO)4 1 kristallisiert monoklin in der Raumgruppe P21/c mit a = 733,6 pm, b = 1089,8 pm, c = 1761,6 pm, β = 99,65° und Z = 4 Formeleinheiten. Die Bindungsabstände des verbrückenden Phosphoratoms zu den beiden Eisengruppierungen Fe(1)(CO)4 und cp(CO)2Fe(2) unterscheiden sich mit 229,0 pm (P—Fe(1)) und 226,5 pm (P—Fe(2)) nur wenig. Der Winkel Fe(1)—P—Fe(2) ist mit 124,8° für vierfach koordinierten Phosphor überraschend groß. Die Koordination an Fe(1) ist trigonal bipyramidal mit axialem Phosphor. Die Ligandsphäre an Fe(2) entspricht der sogenannten „Klavierstuhl“-Anordnung.cp(CO)2Fe(μ-PH2)MnMecp(CO)2 2 kristallisiert monoklin in der Raumgruppe P21 mit a = 750,1 pm, b = 2234,5 pm, c = 974,1 pm, β = 106,23° und Z = 4 Formeleinheiten. Der P—Fe-Bindungsabstand beträgt 230,0 pm, der P—Mn-Bindungsabstand 224,3 pm. Der Winkel Fe—P—Mn ist mit 126,8° sogar noch etwas größer als der entsprechende Winkel in 1. Durch die verbrückende PH2-Gruppe erreichen beide Übergangsmetalle in 2 eine Art „Klavierstuhl“-Anordnung für ihre Ligandsphäre.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Phosphido Complexes. XIII. P-functional Phosphido-Bridged Heterobimetallic Complexes with and without a Metal-Metal Bond; P(SiMe3)2-Bridged cp(CO)xFe Derivativescp(CO)2FeP(SiMe3)2 1 reacts with the carbonyl nitrosyl complexes Co(CO)3(NO), Fe(CO)2(NO)2,Mn(CO)(NO)3 substituting a CO ligand and with the THF complexes M′(CO)5THF(M′ = Cr, Mo, W), Mncp(CO)2THF MnMecp(CO)2 which can be obtained in solution substituting the THF ligand to give the phosphido-bridged bimetallic complexes cp(CO)2Fe[μ-P(SiMe3)2]M′Lm 2 (M′Lm = Co(CO)2(NO) b, Fe(CO)(NO)2 c, Mn(NO)3 d, Cr(CO)5 f, Mo(CO)5 g, W(CO)5 h, Mncp(CO)2 i, MnMecp(CO)2 j). Solutions of Li(Me3Si)2PM′Lm 4e-l (M′Lm = Fe(CO)4 e, Crcp(CO)(NO) k, Vcp(CO)3 l) are available by a selective cleavage reaction of a Si—P bond in the complexes (Me3Si)3PM′Lm 3e-l using n-BuLi. Reactions of cp(CO)2FeBr with 4e-l give the bimetallic complexes 2e-l. The open-chain complexes 2c, 2f, 2h-k undergo a photochemical decarbonylation reaction to form the phosphido-bridged bimetallic complexes cp(CO)Fe[μ-CO, μ-P(SiMe3)2]M′Lm-1(Fe-M′) 5 (M′Lm-1 = Fe(NO)2 c, Cr(CO)4 f, W(CO)4 h, Mncp(CO) i, MnMecp(CO) j, Crcp(NO) k) containing a metal-metal bond. Equilibria between various isomers can partially be observed in solutions of the complexes 5. I.R., N.M.R., and mass spectral data are reported.
    Notes: cp(CO)2FeP(SiMe3)2 1 reagiert mit den Carbonylnitrosylkomplexen Co(CO)3(NO), Fe(CO)2(NO)2, Mn(CO)(NO)3 unter CO-Substitution und mit den in Lösung erhältlichen THF-Komplexen M′(CO)5 THF (M′ = Cr, Mo, W), Mncp(CO)2 THF, MnMecp(CO)2 THF unter THF-Substitution zu den phosphidoverbrückten Zweikernkomplexen cp(CO)2Fe[μ-P(SiMe3)2]M′Lm2(M′Lm = Co(CO)2(NO) b, Fe(CO)(NO)2 c, Mn(NO)3 d, Cr(CO)5 f, Mo(CO)5 g, W(CO)5 h, Mncp(CO)2 i, MnMecp(CO)2 j). Durch selektive Spaltung einer Si—P-Bindung in den Komplexen (Me3Si)3PM′Lm 3e-l (M′Lm = Fe(CO)4 e, Crcp(CO)(NO) k, Vcp(CO)3 l) mit n-BuLi sind Lösungen von Li(Me3Si)2PM′Lm 4e-l zugänglich. Umsetzungen von cp(CO)2FeBr mit 4e-i ergeben die Zweikernkomplexe 2e-l. Durch photochemische CO-Abspaltung aus den offenkettigen Komplexen 2c, 2f, 2h-K sind die phosphidoverbrückten Zweikernkomplexe mit Metall-Metall-Bindung cp(CO)Fe[μ-CO, μ-P(SiMe3)2]M′Lm-1(Fe-M′) 5 (M′Lm-1 = Fe(NO)2 c, Cr(CO)4 f, W(CO)4 h, Mncp(CO) i, MnMecp (CO) j, Crcp (NO) k) erhältlich. In Lösung beobachtet man bei den Komplexen 5 teilweise Gleichgewichte zwischen verschiedenen Isomeren. NMR- und IR-spektroskopische sowie massenspektrometrische Daten werden mitgeteilt.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...