产生了芳基三烷基锡烷阳离子自由基,并通过纳秒瞬态吸收光谱对其进行了表征。动力学表明,锡烷阳离子自由基的断裂是通过双分子亲核试剂辅助机制(S N 2)发生的。与该假设一致,观察到了对亲核试剂和锡烷阳离子自由基的空间位阻。稳态的制备性光氧化实验表明,芳基三甲基锡烷阳离子自由基对芳基自由基的损失优于甲基自由基,并且芳基对甲基自由基损失的选择性取决于亲核试剂的身份。通过基于Bent规则的假设合理化了对芳基自由基损失的偏爱。
The gas-phase fragmentation of trineopentylstannyl cation: a rare example of β-methyl migration within a main group organometallic compound
作者:Dainis Dakternieks、Allan E. K. Lim、Kieran F. Lim
DOI:10.1039/a903098k
日期:——
The lowest-energy fragmentation pathway of trineopentylstannyl cation is the first example of β-methyl migration to an organotin compound in the gas-phase; the origin of the migrating methyl groups is confirmed by an isotopic labelling experiment.