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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 763-772 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Reactive Behaviour of Acyldiorganylphosphane OxidesThe acylphosphane oxides RC(O)P(O)R′R″ (3) are obtained in the case of 3a - e by oxidation of the acylphosphanes RC(O)PR′R″ (1a - e) with rigorously dried oxygen. 3c - e are also formed from the anhydrides (RCO)2O (R = CH3 CF3) and the phosphane oxides XP(O)R′R″ (2c′ d′). 3f only results from ClPPh2 and formic acid [eqs. (2a - c)]. 3d, e dimerize to the phosphinates RC[Ph2P(O)][OP(O)Ph2]C(O)R (4d, e)[eq.(3)] Heating of 3e with ClRh(PPh3)3 causes elimination of CO and formation of C2F6 and [Ph2P(O) — ]2 [eq. (4)]. Thermolysis of 3a - e generates the ketenes X2C2O (X = H, F) and the phosphane oxides 2a′ - e′ [eq. (5)], whereas 3f yields CO and 2d′ [eq. (6)]. 2c′ reacts with 3c to give the alcohol CH3C[(CH3)2P(O)]2OH (5c). With stoichiometric amounts of water 3a, b, d - f are hydrolyzed to the corresponding alcohols RC[R′R″P(O)]2 OH (5a, b, d - f), which isomerize with the exception of 5a to the phosphinates RC[R′R″P(O)][OP(O)R′R″]H (6b - f) [eqs. (7a, b)].
    Notes: Die Acylphosphanoxide RC(O)P(O)R′R″ (3) erhält man im Falle von 3a - e durch Oxidation der Acylphosphane RC(O)PR′R″ (1a - e) mit rigoros getrocknetem Sauerstoff. 3c - e bilden sich auch aus den Anhydriden (RCO)2O (R = CH3, CF3) und Phosphanoxiden XP(O)R′R″ (2c′, d′). 3f entsteht nur aus CIPPh2 und Ameisensäure [Gln. (2a - c)]:3d, e dimerisieren zu den Phosphinaten RC[Ph2P(O)][OP(O)Ph2]C(O)R (4d, e) [Gl. (3)]. Beim Erhitzen eliminiert 3e mit ClRh(PPh3)3 CO unter Bildung von C2F6 und [Ph2P(O)—]2 [Gl. (4)]. Während 3a - e bei der Thermolyse die Ketene X2C2O(X = H, F) und die Phosphanoxide 2a′-e′ liefern [Gl. (5)], gibt 3f CO und 2d′ [Gl. (6)]. 2c′ und 3c reagieren zum Alkohol CH3C[(CH3)2P(O)]2OH(5c). Mit stöchiometrischen Mengen Wasser hydrolysieren 3a, b, d - f zu den entsprechenden Alkoholen RC[R′R″(O)]2 OH (5a, b, d - f), welche sich mit Ausnahme von 5a in die Phosphinate RC[R′R″P(O)][OP(O)R′R″]H (6b - f) isomerisieren [Gln. (7a, b)].
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 793-798 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ambivalent Behavior of Acyl(diphenyl)phosphanes towards Molecular OxygenWhen the acylphosphanes RC(O)PPh2 (4a, b) [R = CH3 (a), CF3 (b)] are „oxidized slowly“ with molecular oxygen the trivalent phosphorus is attacked with formation of the phosphane oxides RC(O)P(O)Ph2 (la, b), which react with water to give the alcohols RC[Ph2P(O)]2OX(2)and phosphinates RC[Ph2P(O)][OP(O)Ph2]X (3). In contrast, „fast oxidation“ results in an attack on the carbonyl group of 4a b, with formation of CO2 and the radicals ·PPh2 and ·R. The combination products of these radicals and the capture reaction with water and alcohols are described.
    Notes: Bei der „langsamen Oxidation“ der Acylphosphane RC(O)PPh2 (4a, b) [R = CH3 (a), CF3, (b)] mit molekularem Sauerstoff wird der dreibindige Phosphor unter Bildung der Phosphanoxide RC(O)P(O)Ph2 (l a, b) angegriffen, welche mit Wasser zu den Alkoholen RC[Ph2P(O)]2OX (2) und Phosphinaten RC[Ph2P(O)][OP(O)Ph2]X (3) weiterreagieren. Im Gegensatz hierzu erfolgt bei der „schnellen Oxidation“ der Angriff des Sauerstoffs an der Carbonylgruppe von 4a, b unter Bildung von CO2 und der Radikale · PPh2 und · R. Die Kombinationsprodukte dieser Radikale und die Abfangreaktion mit Wasser und Alkoholen werden beschrieben.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1456-1463 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation of Aroyl(diphenyl)phosphanes  -  Preparation and Properties of Aroyl(diphenyl)phosphane OxidesWhen PhC(O)PPh2 (l a) is oxidized with molecular oxygen the carbonyl C atom and phosphorus are attacked. Intermediary formed benzoyl diphenylphosphinate is transformed into the anhydrides (PhCO)2O and (Ph2PO)2O. Because the sterically bulky acylphosphanes RC(O)PPh2 (1 b, c) [R = C(CH3)3 (b), 3,5-(NO2)2C6H3 (c)] react with oxygen to give the oxides RC(O)P(O)Ph2 (2 b, c), this mechanism cannot be traced back to steric but electronic effects. The phosphane oxide PhC(O)P(O)Ph2 (2a), which dimerizes to the phosphinate PhC[Ph2P(O)][OP(O)Ph2]C(O)Ph (5a), however is obtained by Arbusov reaction from Ph2P—OCh3 and PhC(O)Cl. The hydrolysis of the phosphane oxides 2a -c to the alcohols RC[Ph2 P(O)]2 OH (3a -c) and their isomerization to the phosphinates RC[Ph2P(O)][O P(O)Ph2]H (4a, c) are described.
    Notes: Bei der Oxidation von PhC(O)PPh2 (1 a) mit molekularem Sauerstoff werden das Carbonyl-C-Atom und der Phosphor angegriffen. Intermediär gebildetes Benzoyl-diphenylphosphinat lagert sich in die Anhydride (PhCO)2O und (Ph2PO)2O um. Dieser Mechanismus ist nicht auf sterische, sondern auf elektronische Effekte zurückzuführen, denn die sterisch anspruchsvollen Acylphosphane RC(O)PPh2 (l b, c) mit R = C(CH3)3 (b) bzw. 3,5-(NO2)2C6H3 (c) reagieren mit Sauerstoff zu den Oxiden RC(O)P(O)Ph2, (2b, c). Das Phosphanoxid PhC(O)P(O)Ph2 (2a,), welches zum Phosphinat PhC[Ph2P(O)][OP(O)Ph2]C(O)Ph (5a) dimerisiert, erhält man jedoch durch Arbusov-Reaktion aus Ph2P—OCH3 und PhC(O)Cl. Die Hydrolyse der Phosphanoxide 2 a - c zu den Alkoholen RC[Ph2P(O)]2OH (3a-c) und deren Umlagerung zu den Phosphinaten RC[Ph2,P(O)][OP(O)Ph2]H (4a, c) werden beschrieben.
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  • 4
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 5
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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