AN NMR STUDY OF THE REACTIONS OF CHLOROPHOSPHINES WITH AlC13. PHOSPHENIUM CATIONS FEATURING A S-P-N LINKAGE
摘要:
The N-P+-S phosphenium cations 1, 2 and 3 have been prepared by treatment of the respective precursor chlorophosphines 4, 5 and 6 with the stoichiometric quantity of AlCl3 in CH2Cl2 solution. The cations 3 are noteworthy that they are the first aliphatic phosphenium cations featuring a P-S bond. That the values of P-31 chemical shifts of phosphenium cations 3 are larger than those of aliphatic N-P+-N and N-P+-Cl cations characterize a relative inferior it-donor ability of RS group to R2N group and to Cl. The exo conformation of group at sulfur to dialkylamino group in 3 is proposed on the rare steric effect on P-31 chemical shifts of substitutes at sulfur.
AN NMR STUDY OF THE REACTIONS OF CHLOROPHOSPHINES WITH AlC13. PHOSPHENIUM CATIONS FEATURING A S-P-N LINKAGE
摘要:
The N-P+-S phosphenium cations 1, 2 and 3 have been prepared by treatment of the respective precursor chlorophosphines 4, 5 and 6 with the stoichiometric quantity of AlCl3 in CH2Cl2 solution. The cations 3 are noteworthy that they are the first aliphatic phosphenium cations featuring a P-S bond. That the values of P-31 chemical shifts of phosphenium cations 3 are larger than those of aliphatic N-P+-N and N-P+-Cl cations characterize a relative inferior it-donor ability of RS group to R2N group and to Cl. The exo conformation of group at sulfur to dialkylamino group in 3 is proposed on the rare steric effect on P-31 chemical shifts of substitutes at sulfur.