decomposition of betaines R3P−CR1R2−SiR3R4−S− (1) follows two main pathways: (a) a Corey—Chaykovsky type reaction with elimination of Ph3P and generation of silathiirane (2) and (b) a retro-Wittig type reaction accompanied by elimination of R3P=CR1R2 and generation of silanethione R3R4Si=S (3). Highly reactive compounds2 and3 undergo subsequent transformations to give derivatives of tetrahydro-1,4-dithia-2
甜菜碱 R3P−CR1R2−SiR3R4−S− (1) 的光解和热分解遵循两条主要途径:(a) Corey-Chaykovsky 型反应,消除 Ph3P 并生成
硅硫醚 (2) 和 (b) 逆向 Wittig型反应伴随着 R3P=CR1R2 的消除和
硅烷硫酮的生成 R3R4Si=S (3)。高活性化合物 2 和 3 经过后续转化,得到四氢-1,4-二
硫杂-2,5-二
硅油、1,3-二
硫杂-2,4-二
硅油烷和symm-四有机二
硅硫烷二
硫醇盐[Ph3P+CHR1R2]2的
鏻盐[(R3R4SiS−)2S]。所得化合物的结构通过X-射线衍射分析和多核NMR光谱确定。