| 摘要 |
The subject matter relevant to this heading is the same as that in parent Specification 1,112,566.ALSO:Novel 1,4-dihydropyridine is prepared by reacting pyridine and an SiH compound in the presence of palladium, rhodium, nickel, platinum, iridium or ruthenium as a catalyst, to form a compound in which the nitrogen atom has an organo substituted silyl group attached directly thereto and removing said organo substituted silyl group to obtain a reaction mixture including 1,4-dihydropyridine. The organo-substituted silyl group is removed by reaction with, for example, methanol, water, ammonia and phosphines. The SiH compound can either be a silane R3SiH where R is an organoxy or monovalent hydrocarbon radical or a polysiloxane containing silanic hydrogen. Many examples of suitable SiH compounds are given (see Division C3). In an example, trimethyl silane is reacted with pyridine in the presence of palladium to yield a mixture of trimethyl silyl substituted hydropyridines from which 1-trimethyl silyl dihydro pyridine is obtained by fractional distillation and reacted with methanol to give 1,4-dihydropyridine. 1,4-Dihydropyridine undergoes vinyl polymerization and polymerization by N-H addition (see Division C3). |
