Sodium dispersion promotes reductive ring opening of arylcyclopropanes. The presence of a reduction-resistant electrophile, such as methoxypinacolatoborane, epoxide, oxetane, paraformaldehyde, or chlorotrimethylsilane, during the reductive ring opening event leads to the formation of 1,3-difunctionalized 1-arylalkanes by immediate trappings of the resulting two reactive carbanions. In particular, the ring-opening 1,3-diborylations of arylcyclopropanes afford 1,3-diborylalkanes with high syn selectivity.

中文翻译：

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芳基环丙烷与金属钠的还原开环 1,3-双官能化

钠分散促进芳基环丙烷的还原开环。还原性开环过程中存在抗还原亲电子试剂，例如甲氧基频哪醇硼烷、环氧化物、氧杂环丁烷、多聚甲醛或氯三甲基硅烷，导致通过立即捕获所得两个反应性碳负离子形成 1,3-双官能化 1-芳基烷烃. 特别是，芳基环丙烷的开环 1,3-二硼基化提供了具有高顺式选择性的 1,3-二硼基烷烃。