titanocene dichloride methylenates aldehydes and ketones to give alkenes, and in a microwave-assisted process, esters and lactones give enol ethers. The methylenating agent in this one-pot procedure is presumed to be titanocene methylidene, which is the same reactive intermediate as that generated from Tebbe, Petasis and Grubbs reagents, each of which have to be prepared before use.
Nysted试剂与二茂
钛二烯二甲撑
甲烷的混合物将醛和酮烯化,得到烯烃,而在微波辅助过程中,酯和内酯则得到烯醇醚。假定该一锅法中的亚甲基化剂是二茂
钛亚甲基,其与由Tebbe,Petasis和Grubbs试剂产生的反应性中间体相同,每种试剂都必须在使用前制备。