The Pudovik reaction (addition of organophosphorus compounds containing a labile P-H bond with alkenes and alkynes) can progess via a radical or (and) ionic mechanism. A comparative and systematic study including various reagents and different activation methods (heating, photochemical or ultrasonic irradiation, and dry medium supported reactions) is presented. Photolysis is the most efficient method
The preparation and reactions of primary phosphine oxides
作者:S.A. Buckler、M. Epstein
DOI:10.1016/0040-4020(62)80003-9
日期:1962.1
The preparation of primary phosphineoxides, RP(O)H2, by the controlled oxidation of primary phosphines is described. Some of the properties of these novel oxides are discussed and their reactions with olefins, carbonyl compounds and isocyanates are reported. These reactions lead to various types of symmetrical and unsymmetrical secondary and tertiary phosphineoxides. Polymers are obtained from reactions
Self-replication of tris(cyanoethyl)phosphine catalysed by platinum group metal complexes
作者:Emiliana Costa、Paul G. Pringle、Martin B. Smith、Kerry Worboys
DOI:10.1039/a704655c
日期:——
The platinum(0) complex [Pt(tcep)3], tcep = P(CH2CH2CN)3, catalyses the formation of tcep from PH3 and CH2CHCN. The complexes [M(tcep)3] (M = Pt, Pd or Ni) and [MCl(tcep)3] (M = Rh or Ir) are compared for their catalysis of the reaction of PH(CH2CH2CN)2 with CH2CHCN to give tcep and it is shown that the platinum(0) complex is the most efficient. The platinum(0) catalysis has been studied in detail, monitoring the kinetics by 31P-1H} NMR spectroscopy. It is revealed that the kinetics are a complex function of the concentration of product tcep. Qualitatively, the rates also depend on [CH2CHCN] and [catalyst]. Both 31P-1H} and 195Pt-1H} NMR spectroscopy suggests that addition of CH2CHCN to [Pt(tcep)3] gives the complex [Pt(tcep)2(η2-CH2CHCN)] which undergoes phosphine exchange on the NMR time-scale. The binuclear complex [Pt2H2(tcep)2µ-P(CH2CH2CN)2}2], formed upon addition of PH(CH2CH2CN)2 to trans-[PtHCl(tcep)2] in the presence of base, is shown to be a catalyst precursor for the reaction of PH(CH2CH2CN)2 with CH2CHCN. Two parallel mechanisms involving mononuclear and binuclear intermediates are discussed to rationalise these observations.
Synthetic, nuclear magnetic resonance and X-ray crystallographic studies of conformations of polyorganophosphorus compounds
作者:Jonathan L. Bookham、William McFarlane、Mark Thornton-Pett
DOI:10.1039/dt9920002353
日期:——
three-bond 31P–31P nuclear spin-spin coupling constants in these vary substantially with the bulk of substituents on or near phosphorus, probably as a result of conformation differences. The structures of (Ph2P)2CHCH2PHPh, (Ph2P)2PCHCH2PH(C6H2But3-2,4,6) and [(Ph2P)2CHCH2]2PPh have been determined by X-ray diffraction and suggest that each of these species adopts a conformation in solution that is
ERH 2(E = P或As; R = Ph,CH 2 CH 2 CN,Bu或C 6 H 2 Bu t 3 -2,4,6)和(Ph 2 P)2 C CH 2或( Ph 2 P)2 C CHR'(R'= H或Me)产生三膦(Ph 2 P)2 CHCHR'ERH和五膦[[Ph 2 P)2 CHCH 2 ] 2 ER和(Ph 2 P)2 CHCH(Me)P(Ph)CH 2 CH(PPh 2)2。其中两个键和三个键的31 P – 31 P核自旋自旋耦合常数随磷上或附近的大部分取代基而显着变化,这可能是由于构象差异造成的。(Ph 2 P)2 CHCH 2 PHPh,(Ph 2 P)2 PCHCH 2 PH(C 6 H 2 Bu t 3 -2,4,6)和[(Ph 2 P)2 CHCH 2 ] 2的结构PPh已通过X射线衍射测定,表明这些物质中的每一个在溶液中均采用与固态相似的构象。