Chinese Journal of Organic Chemistry ›› 2004, Vol. 24 ›› Issue (10): 1168-1190. Previous Articles     Next Articles

联烯的自由基反应

潘峰a, 傅春玲a, 麻生明*,a,b   

  1. a浙江大学化学系 杭州 310027;
    b中国科学院上海有机化学研究所金属有机国家重点实验室 上海 200032
  • 收稿日期:2003-12-23 修回日期:2004-03-16 接受日期:2004-03-16 发布日期:2022-09-20

Radical Reactions of Allenes

PAN Fenga, FU Chun-Linga, MA Sheng-Ming*,a,b   

  1. aDepartment of Chemistry, Zhejiang University, Hangzhou 310027;
    bState Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academemy of Sciences, Shanghai 200032
  • Received:2003-12-23 Revised:2004-03-16 Accepted:2004-03-16 Published:2022-09-20
  • Contact: * E-mail: masm@mail.sioc.ac.cn

Allenes, which contain the functional group of 1,2-propadiene, are highly reactive. In this paper, we review some free-radical reactions of allenes. The application in natural product synthesis is also described. Substituted allenes undergo rather facile radical chain addition reactions. Attack by a radical speciescan occur at either the central or the terminal C atom. In the case of addition, the preferred route is generally that forming the possibly more stable free-radical intermediates. The steric effect, electronegativity and solvent effect shoulde also be considered. In general, carbon-centered free radicalssuch as CH3· and CCl3· add mostly to the terminal carbon atom while heteroatom-based free radicals such as Br·, RS·, ArSO2· and R3Sn· add preferentially to the central carbon atom. Substituted allenes can undergo a varietyof [2+2] cycloaddition reactions with alkenes, allenes, enynes and ketenes and also undergo a cyclopropanation with carbenes via a biradical mechanism.

Key words: allene, radical, addition reaction, cycloaddition, synthetic application