Tertiary 1,5-hexadien-3-ols are transformed at room temperature into δ-ethylenic ketones in 35-90%, yields under two sets of conditions: treatment with one molar equivalent of mercuric trifluoroacetate followed by demercuration of the intermediate α-mercuro ketone with sodium borohydride; and treatment with 0.2 molar equivalent of t of lithium trifluoroacetate or trifluorométhansulfonate. The reactions
在室温下,将
1,5-己二烯-3-醇叔化成35-90%的δ-
乙烯酮,在两种条件下收率:用一摩尔当量的
三氟乙酸汞处理,然后使中间的α-
水银脱
汞酮与
硼氢化钠;用0.2摩尔当量的
三氟乙酸锂或
三氟甲磺酸锂处理。反应是高度立体选择性的,酮的E异构体占产物的80-95%。在第二条件下观察到最高的选择性。