作者:N. Schamp、N. De Kimpe、W. Coppens
DOI:10.1016/0040-4020(75)80198-0
日期:1975.1
Twenty-two dichlorinated methylketones have been submitted to Favorskii rearrangement in NaOMeMeOH. Distribution of products is strongly dependent on substitution. Primary dichloromethyl-ketones (R2 = H) gave rise to Favorskii esters only. Results are explained by a cyclopropanone intermediate, which is formed stereospecifically by disrotative closure of a delocalized zwitter-ion. Opening of the cyclopropanone
已经在NaOMeMeOH中对22个二氯代甲基酮进行了Favorskii重排。产品的分销在很大程度上取决于替代。伯二氯甲基酮(R 2 = H)仅产生Favorskii酯。结果由环丙酮中间体解释,该中间体通过离域封闭的两性离子的旋转封闭立体定向形成。环丙烷酮中间体的打开受空间和电子影响。相反,仲二氯甲基酮(R 2 ≠H)紧接着衍生自溶剂分解机理的甲氧基酮,提供了Favorskii酯。