- 作者: 楊嘉喜; 林黃進; 黃茂鐘
- 作者服務機構: Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Taiwan 320, R.O.C.
- 中文摘要: 2,5-Dimethoxy-2,5-dihydrofuran (DDF) reacts with dichloroketene to give 7,9-dimethoxy-3,3,5,5-tetrachloro-8-oxabicyclo[4,3,0]-noan-2,4-dione (I), and methyl chloro-(2, 5-dihydro-5-methoxy-2-furanylidene) acetate (II). The reactions of 2,5-dihydrofuran and 2,5-dimethoxy-tetrahydrofuran with dichloroketene were also studied for comparison. Compound II was derived from the insertion of a molecule of dichloroketene into the C-O bond of DDF with subsequent dehydrochlorination. Compound I resulted from the cycloaddition of two molecules of dichloroketene to the C=C bond of DDF. A mechanism involving a 1,5-dipolar intermediate is proposed to account for this novel reaction.
- 英文摘要: --
- 中文關鍵字: Dichloroketene; 2,5-dimethoxy-2,5-dihydrofuran; cyclo-addition; 1,5-dipolar intermediate
- 英文關鍵字: Dichloroketene; 2,5-dimethoxy-2,5-dihydrofuran; cyclo-addition; 1,5-dipolar intermediate