CsOH-promoted P-alkylation: a convenient and highly efficient synthesis of tertiary phosphines
作者:Matthew T Honaker、Benjamin J Sandefur、James L Hargett、Alicia L McDaniel、Ralph Nicholas Salvatore
DOI:10.1016/j.tetlet.2003.09.117
日期:2003.11
and efficient method for the synthesis of tertiary phosphines and ditertiaryphosphines has been developed. In the presence of cesium hydroxide, molecular sieves and DMF at room temperature, various secondary phosphines and alkyl bromides were examined, and the results have demonstrated that this methodology offers a general synthetic procedure to produce tertiary phosphines in moderate to high yields
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
Reactions of primary and secondary phosphines with aldehydes and ketones
作者:M. Epstein、S.A. Buckler
DOI:10.1016/0040-4020(62)80004-0
日期:1962.1
The reactions of primary and secondary phosphines with aldehydes and ketones have been studied with particular emphasis on the effects of substituents on phosphorus, and reaction conditions. Oxygen transfer reactions are observed with both primary and secondary phosphines thus providing a new route to secondary and tertiary phosphineoxides. The scope of these reactions has been defined in terms of
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.