Methyl diphenyl phosphine

The cleavage by lithium of a P-C bond in tertiary phosphines gives the phosphide anion. The reduction is accelerated by a factor of 10 imder sonication, and gram quantities of substrates undergo the reaction successfully in a cleaning bath. From methyl diphenyl phosphine, the reaction is selective and only a P-aryl bond is cleaved. The sonication time increases with the amount of substrate. This reaction would probably be improved with the use of probe generators. 

D. Miscellaneous.—A further study of the reactions of diphenyl-phosphine oxide with tetracyclone has confirmed that the reaction yields the oxide (30) under mild, basic conditions, and that the reaction is thermally reversible. The displacement of halogen from phosphorus by amino-compounds has been used in the synthesis of a number of aminofluoro-phosphine oxides (31), and of A-methyl-AA-bis(dichlorophosphinyl)-amine (32). ... 

The different products obtained from the analogous reaction of diphenyl-phosphine oxide are explained in terms of the hardness of nucleophilic centres involved. Similar reactions with 2-methyl-3,4,5-triphenylcyclo-pentadienone gave the phosphonate (39). Gallagher and Jenkins have... 

Phosphine, [2-[(diphenylphosphino)methyl-2-methyl-l,3-propanediyl]bis diphenyl-Phosphine, l,2-ethanediylbis(diethyl-Phosphine, l,2-ethanediylbis(diphenyl-Phosphoric triamide, hexamethyl-... 

WITTIG-HORNER REAGENTS Carbome-thoxyethyl(diphenyl)phosphine oxide. Die-thoxymethyldiphenyl phosphine oxide. Diethyl [(2-tetrahydropyranyloxy)-methyl -phosphonate. Methyl bis(trifluoroethyl)-phosphonoacetate. N-Morpholinodiphenyl-phosphine oxide. Triethylphosphonoace-tate. 

Boiling a solution of (2,2-dimethylhydrazino)diphenyl-phosphine in benzene overnight in contact with dry air causes precipitation of the oxide, (C8H5)2P(0)NHN(CH3)2 (m.p. 167 to 168°). Addition of a stoichiometric amount of sulfur to a boiling benzene solution of (2,2-dimethylhydrazino) diphenylphosphine yields, on cooling, the sulfide, (C H5)2P(S)NHN(CH3)2 (m.p. 95.5 to 97.0°). Alkylation to [(C6H5)2(CH3)PNHN(CH3)2]I (m.p. 156 to 158°) occurs upon reaction with methyl iodide in ether. Reaction with chloramine in ether yields the aminophosphonivun salt, [(C,H,)2P(NH2)NHN(CH,)2]C1 (m.p. 195°). All of the above-described derivatives are colorless solids. 

Warren and co-workers reported that DBU did not influence the formation of olefin from eryi/jro-(2-hydroxyl-l-methyl-2-phenylethyl)diphenyl-phosphine oxide (215) in dimethylformamide (84JCS(P 1)243). 

Some chiral monophosphines were also prepared during the period 1971-1973. Camp (cyclohexyl o-anisyl methyl phosphine) led to a quite high ee (up to 90%) in asymmetric hydrogenation of W-acetyl dehydrophenylalanine [29] and neomenthyl diphenyl phosphine gave modest ee s in the reduction of various conjugated acids [30]. 

The second objective of this study is to determine the feasibility of using diphenyl phosphinic acid as a catalyst for synthesis of dimethyl 4-methyl-1, 3-phenylene dicarbamate (DMPD) from 2, 4-diaminotoluene and DMC (step 6) as follows ... 

BOPjRhSjCjjHj, Boratell-), tetraphenyl-. j[2-[ dipheny phosphino)methyl]-2-methy -l,3-propanediy )bis diphenyl-phosphine)] dithiocarbonato)rho-dium III), 27 287... 

P3CIC0C54H45, Cobalt chlorotris(tri-phenylphosphine)-, 26 190 P3CllrC54H45, Iridium(I), chlorotris(tri-phenylphosphine)-, 26 201 P3C10RhS2C42H3, Rhodium, chioro[[2- (diphenylphosphino)methyl]-2-methyl- l,3-propanediyl]bis(diphenyl-phosphine)](dithiocarbonato)-, 27 289... 

Michael additions of 2-nitropropane to methyl acrylate with soluble, diphenyl-phosphine-functionalized poly(4-tert-butylstyrene) copolymers as nucleophilic catalysts were investigated by Bergbreiter and li [Eq. (9)] [22]. The catalytic reactions were performed in a monophasic system consisting of a mixture of ethanol and heptane at room temperature. After 24 h, a small amount of water was added and phase separation occurred. With this water-induced Hquid/Hquid phase separation, the polymeric catalyst could be recycled and successfully applied again in a catalytic cycle. UV-Vis spectroscopy showed that the catalyst was quantitatively dissolved in the nonpolar, heptane-rich phase. 

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