Three-component reactions with aldehydes, trimethylsilyl trifluoromethanesulfonate or iodide, and triphenylphosphine (TPP) yield the title compounds. The X-ray structure of the cationic part of a representative product, the (4-methylphenyl)[(trimethylsiloxy) methyl]TPP+, shows an interesting lengthening of the P+-C(α) bond compared with reported values for methyl(TPP)+ and benzyl(TPP)+ cations (C(α) represents the P-bonded carbon atom of the various alkyl groups). The behavior of the title compounds towards charged nucleophilic reagents and a powerful electrophile (trifluoromethanesulfonic anhydride) is similar to that of analogous pyridinium salts.
含有醛、三甲基
硅基
三氟甲磺酸酯或
碘化物以及三苯基
磷(
TPP)的三组分反应产生了标题化合物。一个代表性产物的阳离子部分,即(4-甲基苯基)[(三甲基
硅氧基)甲基]
TPP+的X射线结构显示,与已报道的甲基(
TPP)+和苄基(
TPP)+阳离子相比,P+-C(α)键的长度出现了有趣的延长(C(α)表示各种烷基基团中与P连接的碳原子)。标题化合物对带电亲核试剂和一种强电亲体(
三氟甲磺酸无
水物)的反应行为与类似的
吡啶盐相似。