- 作者: 廖俊臣; 林和盛; 林振村
- 作者服務機構: Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 300
- 中文摘要: Diels-Alder reactions of six o-benzoquinones with dimethyl acetylenedicarboxylate has been examined. The yields of adducts vary with the natures of the o-benzoquinones. 3,4-Di-n-propyl-(1c), 3,6-di-n-propyl (1d), 3, 4-dially-(1e) and 3, 6-diallyl-o-benzoquinone (1f) are found to give bicycle α-diketones exclusively without the formation of 1, 4-dioxine derivatives, the yields ranging from 20 to 70%. In the case of 4, 5-dimethoxy-o-benzoquinone, dimethyl 4,5-dimethoxyphthalate is produced in 42% yield, presumably derived from the decomposition of the corresponding initially formedα-diketone. 3, 6-Di-n-propyl-4, 5-dimrthoxy-o-benzoquinone deteriorates without addition to dimethyl acetylenedicarboxylate upon heating. The additions of o-benzoquinones 1c, 1d and 1f to phenylacetylene are also studied. The yield of adducts, α-diketones, range from 23% to 82%.
- 英文摘要: --
- 中文關鍵字: --
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