Phosphite, triphenyl

This method involves the direct polycondensation of aromatic diamines with aromatic diacids in the presence of an aryl phosphite (triphenyl phosphite) and an organic base like pyridine.7,9 70 71 The addition of salts improves die solubility of the polymer and, with this, the maximum attainable molecular weight.71 The concentrations are, however, lower than by the dichloride method. 

Formation of the DVCB derivatives is complicated by the nickel-catalyzed isomerization of m-piperylene into traw.v-piperylene which proceeds through the formation of the cyclobutane (LIII). The rate of isomerization is dependent on the nature of the ligand attached to the metal, and increases in the series tri(o-phenylphenyl)phosphite < triphenyl-phosphine < tricyclohexylphosphine. In the case of the nickel-tricyclo-hexylphosphine catalyst, the rate of isomerization is faster than the cyclization reaction. 

A similar oxidation of trivalent phosphorus to pentavalent phosphorus occurs in trialkyl or triaryl phosphites. Triphenyl phosphite is converted by ozone in dichloromethane at 5-10 C into triphenyl phosphate in 95% yield [775] and by argentic oxide in 30% yield [557] (equation 538). 

CrOioP2C23H24, Chromium, tetracarbonyl-(trimethyl phosphite)(triphenyl phosphite)-, trans-, 23 38... 

The yields and diastereomer ratios of the cyclopropanecarboxylates obtained from ethyl diazoacetate and various alkenes or 1,3-dienes with catalysis by copper bronze, copper(I) chlor-ide/phosphite complexes (phosphite = triisopropyl phosphite, triphenyl phosphite), bis(acet-ylacetonato)copper(II), and copper(II) triflate have been compared. ... 

CrOsSeC4, Chromium(O), pentacarbonyl-(selenocarbonyl)-, 21 1, 4 CiOtP uHu, Chromium, tetracarbonyl-(trimethyl phosphite)(triphenyl-phosphine)-, irons-, 23 38 CK P jiHr, Chromium, tetracarbonyl-... 

Lactones react analogously [although with dialkyl phosphites they give co-(hydroxyacyl)phosphonates if catalysed by base], but telomers are always formed as well as the monomers.3325 Unlike triethyl phosphite, triphenyl phosphite reacts with ethylene carbonate (l,3-dioxolan-2-one) in the presence of small amounts of copper powder to yield tetraphenyl ethylenebisphos-phonate.312... 

The direct polymerization method comprises the direct polymerization of aromatic diamine with the aromatic tricarboxylic acid anhydride in the presence of a dehydration catalyst. Dehydration catalysts include triphenyl phosphite, triphenyl phosphate, and tri-n-butyl phosphite. The reaction... 

They include polyols (mannitol, sorbitol, glycerol or pentaerythritol), hindered phenol antioxidants, the dihydropyridines, epoxidised soya bean oil, certain other epoxy compounds such as isooctyl epoxystearate, the alkyl phosphites (triphenyl phosphite, trisnonylphenyl phosphite, tristearyl phosphite or a diphosphite), 1,3-diketones, and the ketocarboxylates. 

A soln. of triphenyl phosphine in chloroform added dropwise to a vigorously stirred suspension of bromocyanoacetamide and allyl alcohol in chloroform, and allowed to stand overnight triphenylphosphine oxide. Y 80%.—Similarly with benzyl alcohol Triphenyl phosphite triphenyl phosphate. Y 90%. F. e. s. T. Mukaiyama, O. Mitsunobu, and T. Obata, J. Org. Ghem. 30,101,1071 (1965). 

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