Abstract: Reactions of silicon atoms recoiling from the 3'P (n, p) 31Si nuclear transformation in phosphine-butadiene mixtures yield [31Si]-1-silacyclopent-3-ene, also obtained in 46% yield from reaction of thermally generated SiH2 with butadiene, and a product believed to be [31Si]-l-silacyclopenta-2, 4-diene. The variation of product yields with the composition of PH3-SiH4-C4H6 recoil reaction mixtures casts doubt on the participation of ground-state ...
