-ji substitution benjirupirijiniumu salt

摘要

NEW MATERIAL:The subject salt expressed by formula I (R1 to R3 are H, halogen, alkyl, alkoxy, NO2, NH2, alkylamino, CN, etc.; R4 and R5 are halogen or alkyl; R6 and R7 are H, R4, R5, NO2, CN, alkoxy, NH2, etc.; M is As, Sb, B or P; X is halogen; n is 4 when M is B and n is 6 otherwise). EXAMPLE:1-(alpha, alpha-Dimethylbenzyl)pyridinium hexafluoroantimonate. USE:It is cleaved by temperature increase to form the corresponding carbonium cation of formula II and starts the polymerization chain reaction of a cation- polymerizable monomer. It can be used as a latent thermal cationic initiator free from ill odor apd cleaving at a relatively low temperature to prevent the discoloration of the polymer. PREPARATION:The compound of formula I can be produced by reacting an alpha, alpha-disubstituted benzyl halide with a (substituted) pyridine and converting the halogen anion of the resultant pyridinium halide with MXn-.