C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/309.1, 260/2
C07D 275/06 (2006.01) C07C 41/14 (2006.01) C07C 43/225 (2006.01) C07D 279/02 (2006.01) C07D 295/073 (2006.01) C07D 309/12 (2006.01) C07D 455/04 (2006.01) C09B 11/04 (2006.01) G03C 8/48 (2006.01)
Patent
CA 1109069
ABSTRACT OF THE DISCLOSURE This invention relates to certain 3,3-di(4'-OP- carbocyclic aryl)-2,3-dihydrobenz[d]isothiazole-1,1-dioxides (and-2,3-dihydronaphtho[1,8-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 organometal- lic 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-chlorobenz[d]isothiazole-1, 1-dioxide and a 3-chloronaphtho[1,8-de]-1,2-thiazine-1,1- dioxide to give the corresponding 3,3-di(4'-OP-carbocyclic aryl)-2,3-dihydrobenz[d]isothiazole-1,1-dioxide or the corresponding 3,3-di(4'-OP-carbocyclic aryl)-2,3-dihydranaph- tho[1,8-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.
311906
Bloom Stanley M.
Borror Alan L.
Foley James W.
Polaroid Corporation
Smart & Biggar
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