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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 2 (1963), S. 1065-1067 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    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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  • 3
    ISSN: 1434-4475
    Keywords: Bis(diphenylarsino)maleic acid, derivatives ; Bis(diphenylstibino)maleic anhydride, synthesis, crystal structure ; Bis(phenylthio)maleic acid, derivatives ; Maleic acid derivatives, synthesis, molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The unusual properties of bis(diphenylphosphino)maleic anhydride and similar ditertiary phosphines has prompted the synthesis of analogous arsines and stibines. Bis(diphenylarsino)maleic anhydride,-maleic thioanhydride and-N-methyl maleic imide, bis(diphenylstibino)maleic anhydride (5) and-maleic thioanhydride are obtained as crystalline yellow or red compounds by the reaction of the corresponding 2,3-dichloromaleic acid derivatives with diphenyl(trimethylsilyl)arsine and-stibine resp. The uv/vis spectra and characteristic i.r. bands of selected compounds are given and compared with those of the corresponding phosphines. The strong shift of νC=C to lower wavenumbers observed in all compounds has caused the determination of crystal and molecular structure of5 by x-ray diffraction. Bond distances and angles are given. The complex formation of the new diarsine ligands has been examined by the preparation of Ni-, Cr- and Mo-carbonyl derivatives. As the first organylsulfane substituted maleic acid derivatives bis(phenylthio)maleic thioanhydride,-N-methyl-maleic imide and-maleic acid dimethylester are synthesized and described.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-4475
    Keywords: Crystal structure ; Electronic transitions and structure ; Oxalic acid phosphides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The unexpected violet colour of P,P′-tetraphenyl-oxalic acid diphosphide (3) stimulated the synthesis of the following derivatives: P,P′-tetra-t-butyl-oxalic acid diphosphide (2), N,P-tetraphenyl-oxalic acid amide phosphide (4) and P, α-triphenyl-glyoxylic acid phosphide (5). The compounds could be prepared by the reaction of the corresponding acyl chlorides with diorganyl-(trimethylsilyl) phosphine; (organyl=t-butyl and phenyl). The electronic transitions of green-blue2 and red5 in the 450–700 nm region are discussed, also theirv C=O in the ir spectrum. These results are interpreted in connection with the molecule structures of2 and3 which have been determined by X-ray crystal structure analysis. In2 the framework P−C(O)−C(O)−P is only slightly distorted from a coplanartrans-position, in3 somewhat more. The bonds at P have the expected pyramidal arrangement. The direction of the lone pairs at the P-atoms, derived from this bond arrangement, is discussed with respect to the electronic transitions in acyl phosphides.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 176 (1960), S. 118-121 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Eine 2%ige Lösung von 1-Phenyl-5-mercapto-tetrazol in Methanol gibt mit Zinklösungen auch bei starker Verdünnung einen weißen Niederschlag. Die Reaktion kann im Rahmen eines normalen analytischen Trennungsganges zur qualitativen und auch zur quantitativen Zn-Bestimmung dienen. Von den mit Zn in einer analytischen Gruppe auftretenden Ionen des Ni, Co und Mn stören nur die beiden ersten und müssen abgetrennt werden.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2085-2088 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Coordination of Boron in triptych-Boroxazolidine (Triethanolamine Borate) and its Addition Compound with Antimony PentachlorideAdditional spectroscopic measurements of B(OC2H4)3N (1) and of the newly prepared 1 : 1-adduct with antimony pentachloride confirm a pyramidal O3B—N-structure for 1 and a trigonal-planar BO3-structure for the adduct. The thermal decomposition of 1 yields B2O3 and some derivatives of morpholine.
    Notes: Ergänzende spektroskopische Untersuchungen an B(OC2H4)3N (1) und seinem neu hergestellten 1:1-Addukt mit Antimonpentachlorid bestätigten für 1 eine pyramidale O3B—N-Anordnung und wiesen für das Addukt eine trigonal-planare BO3-Anordnung nach. Die thermische Zersetzung von 1 bei 240° ergibt in der Hauptsache Bortrioxid und einige Morpholinderivate.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 177-187 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diphenyl(trimethylsilyl)phosphine as a Reagent for the Preparation of Acylphosphides resp. phosphino Derivatives of Dicarboxylic Acids and Squaric Acid.Some new diphenylphosphides resp. diphenylphosphino derivatives of dicarboxylic acids and squaric acid have been synthesized by the aid of diphenyl(trimethylsilyl)phosphine. Most of the compounds are coloured and sensitive to light. Their vibration spectra are discussed.
    Notes: Die Umsetzung von Acylchloriden mit Diphenyl(trimethylsilyl)phosphin bietet einen präparativen Weg zu Acyl-(diphenylphosphiden) bzw. Diphenylphosphinoderivaten. Auf diese Weise wurden diese Derivate von einigen Dicarbonsäuren und der Quadrasäure erhalten. Die Verbindungen sind zumeist farbig und lichtempfindlich. Ihre Schwingungsspektren werden diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 8
    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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  • 9
    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.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 117-122 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2,3-Bis(diphenylphosphino)maleic Anhydride and Diphenylphosphino Derivatives of Cyclobutenedione as Ligands in Metal Carbonyls2,3-Bis(diphenylphosphino)maleic anhydride is prepared from 2,3-dichloromaleic anhydride and diphenyl(trimethylsilyl)phosphine. With this compound as a bidentate ligand the complexes Ni(CO)2L and M(CO)4L (M=Cr, Mo, W) are obtained. These are stable and deeply coloured, dut to an absorption band in the region of 17500 cm-1 which shows a strong solvatochromic effect. With 1,2-bis(diphenylphosphino)cyclobutenedione as ligand L only the complex Ni(CO)2L could be prepared, with immediately decomposes at ligand forms stable complexes of the type M(CO)5L (M=Cr, Mo).
    Notes: Aus 2.3-Dichlomaleinsäureanhydrid und Diphenyl(trimethylsilyl)phosphin dargestelltes 2,3-Bis(diphenylphosphino)maleinsäureanhydrid kann als zweizähniger Ligand in Carbonylen des Ni, Cr, Mo und W zwei CO substituieren. Die so dargestellten Komplexe sind luftbeständig und überraschend tieffarbig; ihre bei ∼17500 cm-1 beobachtete Absorptionsbande zeigt einen starken Solvatochromieeffekt. 1,2-Bis(diphenylphosphino)cyclobutendion konnte nur in Ni(CO)4 unter Substitution von zwei CO eingeführt werden. Die Charakterisierung der orangefarbenen kristallinen Verbindung wird durch ihre extreme Lichtempfindlichkeit erschwert. Dagegen bildet 1-(Diphenylphosphino)-2-phenylcyclobutendion als einzähniger Ligand L stabile Komplexe vom Typ M(CO)5L mit M=Cr, Mo.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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