Reaction of P-chloro-, P-bromo-, and P-iodoiminophosphines with 1-alkoxyacetylenes proceeds as an electrophilic regioselective addition across the triple bond with conservation of biscoordinate phosphorus providing 1-aza-2-phosphabutadienes. The stereochemistry of the resulting product depends on the character of the alkyl and alkoxy substituents in the alkyne, on the halogen in the iminophosphine, on the polarity of the solvent and the concentration of reagents. The azaphosphabutadienes easily enter into [2+1]-cycloaddition with the second equiv of alkyne to furnish P-alkenyl-substituted phosphirenes. They also add hydrogen halides to the P=N bond forming acyl halides of alkenylphosphonous acids amides. The possibility of Z/E-isomerization of the alkenyl moiety in all the compounds synthesized was investigated.
Formation of a PIII−C(sp2) bond by addition of diphenyl(trimethylsilyl)phosphine to activated acetylenes
作者:A. N. Kochetkov、I. V. Efimova、I. G. Trostyanskaya、M. A. Kazankova、I. P. Beletskaya
DOI:10.1007/bf02495698
日期:1998.9
Diphenyl(trimethylsilyl)phosphine reacts with alkoxy(alkyl)acetylenes to give mixtures of addition products, (2-alkoxy-2-trimethylsilylalkenyl)diphenylphosphines and (2-alkoxyalkenyl)diphenylphosphines. The reaction is sensitive to the solvent; in MeCN, it gives only nonsilylated products. (1-Alkoxyethenyl)diphenylphosphines were obtained as the main products upon the reaction of Ph2PSiMe3 with terminal