Nucleophilic substitution in benzylic phosphonothioic dichlorides formation of a diamide without intervention of the amidic chloride
作者:Martin J.P. Harger
DOI:10.1016/0040-4039(96)01880-1
日期:1996.11
The diamide RP(S)(NEt2)2 (R = PhCH2 or Ph2CH) is formed directly from the dichloride RP(S)Cl2 more quickly than it is from the amidic chloride RP(S)(NEt2)Cl
Methylenethioxophosphorane (thiophosphene) intermediates in the reactions of diphenylmethylphosphonamidothioic chlorides with amines. Differences between the elimination–addition mechanisms of nucleophilic substitution for PS and PO substrates
作者:Martin J. P. Harger
DOI:10.1039/b109944m
日期:2002.2.25
In reactions with R2NH (R = Me or Et) in CHCl3 the PS substrate Ph2CHP(S)(NMe2)Cl differs markedly from its PO counterpart: the rate of substitution is increased much more by a 4-nitro substituent but is also more sensitive to the bulk of the amine, there is greater discrimination between competing nucleophiles, and with R2ND there is relatively little H–D exchange at the α carbon atom prior to substitution