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  • Articles: DFG German National Licenses  (14)
  • 1975-1979  (14)
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  • Articles: DFG German National Licenses  (14)
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Year
  • 1
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction between 2,3-dichloromaleic acid dialkylester (alkyl=CH3 and C2H5) and diphenyl(trimethylsilyl)phosphine, leading to diphenylphosphine substituted esters of maleic and fumaric acid has been studied. With a molar ratio 1:1 of the components 2-chloro-3-diphenylphosphinomaleic acid dimethylester (3) and-diethylester are obtained as colourless crystalline compounds. From a 1:2 reaction however only bis(diphenylphosphino)fumaric acid dimethylester (colourless crystals) and-diethylester (yellow) can be crystallized, the latter in a partially oxydized form. The presence of bis(diphenylphosphino)maleic acid diester in the oily part of the reaction products has been proved by its chelating with Ni2+ and Pd2+ to complexes of the compositionMeCl2·(PP). Pure bis(diphenylphosphino)maleic acid dimethylester (4) could be synthesized by alcoholysis and following methylation of bis (diphenylphosphino)maleic anhydrid. Contrary to this easily chelating and air stable compound the corresponding fumaric acid diesters give no complexes with the metals examined as far and are very sensitive towards oxygen. This sensitivity decreases strongly after oxydation to 2-diphenylphosphino-3-diphenylphosphorylfumaric acid diester, the diethylester of which could be crystallized in pure form. Characteristic vibration bands, uv/vis-absorption and31P-nmr peaks are discussed. The result of X-ray diffraction data of3 and4 are reported and conformation, bond lengthes and bond angles of these molecules are given.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3091-3095 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure and Properties of Dimethyl 2,3-Bis(diphenylphosphino)fumarateBy X-ray crystal structure determination it is shown that the substitution of the chlorine atoms in dimethyl 2,3-dichloromaleate by diphenylphosphino groups yields the title compound instead of the expected derivative of maleic acid. Its space group is P21/c. The unit cell contains two molecules with an inversion centre in the middle of the C=C-bond. Reaction with oxygen or sulfur yields the corresponding phosphine oxide and sulfide.
    Notes: Durch röntgendiffraktometrische Kristallstrukturbestimmung wurde festgestellt, daß bei der Substitution der Chloratome des 2,3-Dichlormaleinsäure-dimethylesters durch Diphenylphos-phinogruppen nicht das erwartete Maleinsäurederivat entsteht, sondern eine cis-trans-Umlagerung zum entsprechenden Fumarsäurederivat (1) stattfindet. Die Verbindung kristallisiert in der Raumgruppe P21/c mit der 2 Formeleinheiten enthaltenden Elementarzelle a = 11.490 Å, b = 8.621 Å, c = 13.688 Å, β = 95.93°. In der Mitte der C=C-Doppelbindung der Moleküle liegt ein Inversionszentrum. Durch Reaktion mit Sauerstoff bzw. Schwefel erhält man aus 1 das entsprechende Phosphinoxid bzw. -sulfid.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of Derivatives fo 2,3-Bis(diphenylphosphino)maleic Anhydride as a Contribution to the Problem of Colour, Conjugation, and complex Formation of this Class of CompoundsDerivatives of 2,3-bis(diphenylphosphino)maleic anhydride containing S, C (as ) and N (as or ) as heteroatom within the ring system (3-6) are prepared from the corresponding 2,3-dichloro compounds with the aid of diphenyl(trimethylsilyl)phosphine. These new compounds form chelate complexes of the type Ni(CO)2. L, Cr(CO)4-L (7-14). Ligands and complexes are strongly coloured. The heteroatom of the maleic anhydride ring influences remarkably the corresponding absorption bands. The solvatochromic effect on the low wave number absorption band of the metal(O) complexes is examined. For comparison 2,3-bis(diphenylamino)-N-methylmaleimide (15) and two diphenylphosphino derivatives (16, 18) of 3,4-dichloro-5-methoxy-2(5H)-furanone are synthesized. The vc=c bands of the compounds are assigned. The observed shifts (up to 120 cm-1) and the dependence of the colour on the size of the conjugated system are discussed.
    Notes: Derivate des 2,3-Dichlormaleinsäure-anhydrids, die als Heteroatom im Fünfring S, C (als ) und N (als bzw. )enthalten, wurden mit Diphenyl(trimethylsilyl)phosphin in die jeweiligen 2,3-Bis(diphenylphosphino)-Derivate (3-6) übergeführt, die als zweizähnige Liganden zwei CO in den Carbonylen von Ni, Cr und Mo substituieren können (7-14). Die freien Liganden und ihre Metallcarbonyle sind intensiv farbig. Die entsprechenden Absorptionsbanden zeigen einen beträchtlichen Einfluß des Heteroatoms im Fünfring an. Weiterhin wurde die Solvatochromie der langwelligsten Absorptionsbande in den Metallcarbonylderivaten untersucht. Zu Vergleichszwecken wurden ferner 2,3-Bis(diphenylamino)-N-methylmaleinimid (15) und zwei Diphenyl-phosphinoderivate (16, 18) des 3,4-Dichlor-5-methoxy-2(5H)-furanons erstmals dargestellt. Die Zuordnung von vc=c ist nunmehr in allen diesen Verbindungen möglich. Ihre bis zu 120 cm-1 betragende Verschiebung und die Abhängigkeit der Farben der Verbindungen von der Ausdehnung des konjugierten Systems werden diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phenylbis(trimethylsilyl)phosphine and 1,2-Diphenyl-1,2-bis(trimethylsilyl)diphosphane as Reagents for the Preparation of Heterocyclic Phosphor Compounds and Acylphosphines.The cyclic diacyl phosphines of phthalic acid and diphenic acid (4, 5) are obtained by reaction of the acyl chlorides with phenylbis(trimethylsilyl)phosphine (1). 1 yields with acetyl chloride diacetylphenylphosphine (3). Starting with 2,3-dichloromaleic acid anhydride or -thioanhydride and 1 derivatives of 1,4-dihydro-p-diphosphorin (6, 7) are prepared. Acyl-substituted 1,2-diphenyldiphosphanes (8, 9) are obtained from 1,2-diphenyl-1, 2-bis(trimethylsilyl)diphosphane (2) and benzoyl chloride or ethoxalyl chloride.
    Notes: Aus Phthalsäure-dichlorid bzw. Diphensäure-dichlorid werden durch Reaktion mit Phenylbis(trimethylsilyl)phosphin (1) die zu erwartenden cyclischen Diacylphosphine (4, 5) dargestellt. Aus 1 und Acetylchlorid erhält man Diacetylphenylphosphin (3). Mit 2,3-Dichlormaleinsäure-anhydrid bzw. -thioanhydrid und 1 entstehen unter Verknüpfung von 2 Anhydridringen Derivate des 1,4-Dihydro-p-diphosphorins (6, 7). Durch Reaktion von 1,2-Diphenyl-1,2-bis(trimethylsily)diphosphan (2) mit Benzoylchlorid bzw. Äthoxalychlorid erhält man Acylderivate des 1,2-Diphenyl-diphosphans (8 und 9).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 315-321 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nickel(II) and Palladium(II) Complexes of 2,3-Bis(diphenylphosphino)maleic Anhydride. Preparation, Properties, and Reactions with MethanolSynthesis and properties of 1:1 complexes of nickel halides or PdCl2 with 2,3-bis(diphenylphosphino)maleic anhydride (1) are described. The complexes contain planar coordinated metal atoms. Their crystallisation from acetone or 1,2-dichloroethane yields clathrate compounds with the solvent (2-9). In the presence of methanol 2-9 are converted into the corresponding complexes of 2,3-bis(diphenylphosphino)maleic acid monomethyl ester (e. g. 10) and with excess methanol at elevated temperature into such of 2,3-bis(diphenylphosphino)acrylic acid methyl ester (e. g. 12). These new ligands (11, 13) are set free by substitution reactions of their complexes.
    Notes: Darstellung und Eigenschaften von 1:1-Komplexen aus Nickelhalogeniden bzw. Palladiumchlorid und Bis(diphenylphosphino)maleinsäure-anhydrid (1) werden beschrieben. Die Komplexe enthalten planar koordinierte Metallatome und bilden bei der Kristallisation aus Aceton oder 1,2-Dichlorethan Einschlußverbindungen mit dem jeweiligen Lösungsmittel (2-9). In Gegenwart von Methanol wandeln sie sich in die entsprechenden Komplexe des 2,3-Bis(diphenylphosphino)maleinsäure-monomethylesters (z. B. 10) bzw. bei Methanolüberschuß und erhöhter Temperatur in solche des 2,3-Bis(diphenylphosphino)acrylsäure-methylesters (z. B. 12) um. Aus diesen Komplexen werden die bisher unbekannten Liganden (11, 13) durch Verdrängungsreaktionen freigesetzt.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 88 (1976), S. 415-415 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 488-489 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 363-375 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Properties, and Crystal Structures of Paramagnetic Carbonyl Derivatives of Cobalt and Manganese with 2,3-Bis(diphenylphosphino)maleic Anhydride and Related Phosphines as LigandsA new type of paramagnetic complexes is obtained from Co2(CO)8 or Mn2(CO)10 and 2,3-bis-(diphenylphosphino)maleic anhydride or its derivatives (PP). Their composition is (PP)Co(CO)3 (1-4) and (PP)Mn(CO)4 (5). The valence shell of Co and Mn would contain one electron more than the crypton shell, if all donor atoms of the ligands contribute one electron pair in the normal way of carbonyl and phosphine complexes. It is shown by ESR, IR, and X-ray examinations, that this unpaired electron is delocalized on the phosphine ligand turning the latter to a complex-bonded radical anion. With iodine the paramagnetic complexes 1 or 5 are oxidized to cations forming iodides (6, 7). The reaction of Fe2(CO)9 and Co(CO)3NO with the phosphine ligand yields the electroneutral complexes (PP)Fe(CO)3 (8) and (PP)Co(CO)NO (9).
    Notes: 2,3-Bis(diphenylphosphino)maleinsäure-anhydrid bzw. Derivate hiervon (PP) reagieren mit Co2(CO)8 und Mn2(CO)10 unter Spaltung der Metall-Metall-Bindung und Substitution von CO zu neuartigen paramagnetischen Komplexen der Formel (PP)Co(CO)3 (1 - 4) und (PP)Mn(CO)4 (5). Bei normaler komplexchemischer Bindung der Elektronenpaardonoren enthalten die Valenzschalen des Co und Mn ein Elektron mehr, als der Kryptonschale entspricht. IR-, ESR- und Kristallstrukturuntersuchungen zeigen, daß dieses ungepaarte Elektron auf den Phosphinliganden delokalisiert ist, der damit zu einem komplex gebundenen Radikalanion wird. Durch Oxidation von 1 bzw. 5 mit Iod werden ionische Iodide (6, 7) gebildet. Die Umsetzung des Phosphinliganden mit Fe2(CO)9 bzw. Co(CO)3NO führt zu den elektroneutralen Komplexen (PP)Fe(CO)3 (8) und (PP)Co(CO)NO (9).
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 91 (1979), S. 754-755 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 91 (1979), S. 755-756 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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