Nysted reagent [cyclo-dibromodi-µ-methylene(µ-tetrahydrofuran)trizinc], a commercially available gem-dimetallic compound, reacted with aldehydes affording methylenated products in the presence of BF3·OEt2, whereas methylenation of ketones proceeded in the presence of BF3·OEt2 and TiCl2.
Nysted试剂[环二
溴二-µ-亚甲基(µ-
四氢呋喃)三
锌],一种在商业上可获得的宝石二
金属化合物,在
BF3·OEt2的存在下与醛发生反应,生成亚甲基化产物,而在 ·OEt2和TiCl2的存在下,酮的亚甲基化反应得以进行。