The chromium Reformatsky reaction allows the highly chemoselective addition of ester enolates to aldehydes or methyl ketones at room temperature. Aldehyde selectivities of ≥ 50:1 vs. methyl ketones and ≥ 200:1 vs. larger ketones and other electrophiles can be achieved in most cases. Methyl ketones are preferred with similar effectivity against higher ketones. Effects of solvents, lithium iodide and substituents are discussed.
铬 Reformatsky 反应允许在室温下将酯烯醇化物高度
化学选择性地加成到醛或甲基酮上。在大多数情况下,与甲基酮相比,醛选择性≥ 50:1,与较大酮和其他亲电试剂相比,醛选择性≥ 200:1。优选甲基酮,其对高级酮具有相似的功效。讨论了溶剂、
碘化
锂和取代基的影响。