The Diels-Alderreaction of 1,7-, 2,7-, 2,6-, 1,6-dihydroxynaphthalene and 6-bromo-2-naphthol with maleic anhydride was investigated. All of these 2-naphthol derivatives gave exo- and endo-adducts (II and III) except for the bromo-naphthol, from which only endo-adduct was obtained. The assignment of exo or endo configuration was based on lactone formation on NaBH4 reduction possible only from the exo
The dechlorination of some highly chlorinated naphthalene derivatives
作者:Neil J Hales、Harry Heaney、John H Hollinshead、Steven Mf Lai、Pritpal Singh
DOI:10.1016/0040-4020(95)00396-p
日期:1995.7
The [4+2]cycloadducts formed between tetrachlorobenzyne and a variety of arenes and cyclic 1,3-dienes have been reductively dechlorinated. The products are formally benzyne cycloadducts, many of which are difficult to make by other routes. High yields are obtained when sodium and t-butanol in boiling THF are used for the reduction. THF serves as a solvent but t-butanol not only acts as a proton donor