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Abstract

Abstract WHEREIN Z3 IS A TROPONOID SUBSTITUENT ON THE CYCLOHEPTATRIENE RING SAID SUBSTITUENT BEING A MEMBER SELECTED FROM THE GROUP CONSISTING OF A LOWER ALKYL (C1-C4) GROUP, A HALOGEN ATOM, A LOWER ALKOXYL GROUP, AN ARYL GROUP, AN ALKYLARYL GROUP AND A CONSISTING OF AN OXYGEN ATOM AND SELECTED FROM THE GROUP CONSISTING OF AN OXYGEN ATOM AND A N-H GROUP; Z2 IS AN ORGANIC SUBSTITUTED OR UNSUBSTITUTED ATOMIC GROUP NECESSARY TO COMPLETE A 5 OR 6 MEMBERED HETEROCYCLIC RING SELECTED FROM THE GROUP CONSISTING OF THE OXAZOLINE SERIES, OXAZOLE SERIES, BENZOXAZOLE SERIES, NAPHTHOXAZOLE SERIES, THIAZOLINE SERIES, THIAZOLE SERIES, BENZOTHIAZOLE SERIES, NAPHTHOTHIAZOLE SERIES, SELENAZOLE SERIES, BENZOLSELENAZOLE SERIES, NAPHTHOSELENAZOLE SERIES, 2-PYRIDINE SERIES, 4-PYRIDINE SERIES, 2-QUINOLINE SERIES, 4QUINOLINE SERIES, IMIDAZOLE SERIES, BENZIMIDAZOLE SERIES, AND NAPHTHOIMIDAZOLE SERIES; R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A LOWER ALKYL GROUP, A HYDROXY (LOWER) ALKYL GROUP, A LOWER ALKOXY ALKYL GROUP, A SULFO (LOWER) ALKYL GROUP, A CARBOXY (LOWER) ALKYL GROUP, AN ACETOXY (LOWER9 ALKYL, A VINYL METHYL GROUP, AN ARALKYL GROUP, AND A SULFO ARALKYL GROUP; L1 AND L2 ARE A GROUP FROM THE METHINE SERIES, SAID L2 CAPABLE OF FORMING A METHYLENE CHAIN TOGETHER WITH SAID R GROUP; X IS AN ANION AND M AND N EACH IS 0 OR 1, PROVIDING THAT N IS 0 WHEN THE DYE FORMS AN INTRAMOLECULAR SALT, SAID DYE BEING PRESENT IN A SENSITIZING AMOUNT. Z3-1,3,5-CLCLOHEPTATRIENE 17. A DIRECT POSITIVE SILVER HALIDE PHOTOGRAPHIC EMULSION COMPRISING FOGGED SILVER HALIDE GRAINS AND AT LEAST ONE DYE OF THE FORMULA: 1,6-(-Z1-CO-C(-L1=L2-C<(=(CH-CH)=N(+)(-R)(X(-))N-Z2-))=),

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