| 摘要 |
<p>This invention relates to certain 3,3-di(4'-OP-carbocyclic aryl)-2,3-dihydrobenzd!isothiazole-1,1-dioxides (and-2,3-dihydronaphtho1,8-de!-1,2-thiazine-1,1-dioxides) and to the preparation thereof by reacting (a) at least 2 equivalents of (i) a 4'-OP-carbocyclic aryllithium compound wherein P is a protecting group compatible with organometallic reagents or (ii) a 4'-OP-carbocyclic arylMgE compound wherein P is a protecting group compatible with organometallic reagents and E is chloro, bromo or iodo and (b) 1 equivalent of a compound selected from a 3-chlorobenzd!isothiazole-1, 1-dioxide and a 3-chloronaphtho1,8-de!-1,2-thiazine-1,1-dioxide to give the corresponding 3,3-di(4'-OP-carbocyclic aryl)-2,3-dihydrobenzd!isothiazole-1,1-dioxide or the corresponding 3,3-di(4'-OP-carbocyclic aryl)-2,3-dihydranaph-tho1,8-de!-1,2-thiazine-1,1-dioxide, which compounds are useful in the synthesis of phenol and 1-naphthol sulfam(na)phthaleins employed, for example, as photographic optical filter agents and filter agent precursors.</p> |
