title: alpha-Hypervalent iodine functionalized phosphonium and arsonium ylides and their tandem reaction as umpolung reagents.
abstract: alpha-Hypervalent iodine functionalized phosphonium and arsonium ylides 2 can be used as umpolung ylides to react with nucleophiles to give alpha-heteroatom substituted ylides 4 in good yields. The nucleophilic substitution-Wittig tandem reaction of 2 can occur smoothly to provide an efficient method for the synthesis of (Z)-alpha-halo-alpha,beta-unsaturated enoates or enones 6, stereoselectively.
authors.affiliation: Department of Chemistry, Zhejiang University, Xixi Campus, Hangzhou 310028, P. R. China.
authors.forename: Zhizhen
authors.initials: Z
authors.lastname: Huang
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Yu
authors.forename: Xian
authors.initials: X
authors.lastname: Huang