Ring-enlargement of methoxynaphthalenes with dichlorocarbene to benzotropone derivatives.
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概要
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The dichlorocarbene addition to various di- and trimethoxynaphthalenes has been investigated systematically. It has been found that the carbene addition is oriented by the 1-methoxyl group to the 3,4-double bond and by the 2-methoxyl group to the 1,2-double bond of naphthalene nucleus, and that the spontaneous cyclopropane ring-opening of the intermediate carbene-adducts leads to the preferencial formation of 2,3-benzotropone over 4,5-benzotropone derivatives. The steric effects by methoxyl group seem not to be significant in either the carbene-addition or ring-opening reaction.
- 公益社団法人 日本化学会の論文
著者
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Tsunetsugu Josuke
Department Of Chemistry Faculty Of Science Saitama University
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Sato Masaru
Department Of Applied Chemistry School Of Advanced Science And Engineering Faculty Of Science And En
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Ebine Seiji
Department of Chemistry, Faculty of Science and Engineering, Saitama University
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