2,2-Diphenyl-1,3,4-thiadiazoline, prepared from thiobenzophenone and diazomethane at −78°C, extrudes N2 at −45°C and allows to study in situ 1,3-cycloadditions of thiobenzophenone S-methylide (3) with electrophilic CS, CC, CC, and NN bonds.
The activity scale of dipolarophiles versus thiobenzophenone s-methylide
作者:Rolf Huisgen、Li Xingya
DOI:10.1016/s0040-4039(00)88294-5
日期:——
Competition experiments of pairs of dipolarophiles for thiobenzophenone S-methylide () furnish relative rate constants which reveal an unusually high selectivity of the nucleophilic 1,3-dipole, in accordance with Sustmann's PMO concept.