Pentamethine thiopyrylium salts, process for production thereof, and photoconductive compositions containing said salts
AssigneeFuji Photo Film Co., Ltd.
InventorsKoichi Kawamura, Harumi Katsuyama, Hideo Sato
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Abstract
2,6-Di-tert-butyl-4-[5-(2,6-di-tert-butyl-4H-thiopyran-4-ylidene)penta-1,3- dienyl]thiopyrylium salts, which are novel, colorless, transparent, having an adsorption in the far infrared to near infrared region and capable of imparting high sensitivity to photoconductive substance; process for producing the salts; and a photoconductive composition containing the salt.
Claims29
A photoconductive composition comprising a photoconductive material and a 2,6-di-tert-butyl-4-[5-(2,6-di-tert-butyl-4H-thiopyran-4-ylidene)penta-1 ,3-dienyl]thiopyrylium salt of chemical structural formula (I) ##STR8## wherein Z.sup..crclbar. represents an anion, and X represents a hydrogen atom, a halogen atom, an alkyl group or an aryl group.
A 2,6-di-tert-butyl-4-[5-(2,6-di-tert-butyl-4H-thiopyran-4-ylidene)penta-1,3 -dienyl]thiopyrylium salt of the following formula ##STR9## wherein Z.sup..crclbar. represents an anion, and X represents a hydrogen atom, a halogen atom, an alkyl group or an aryl group.
A process for preparing a 2,6-di-tert-butyl-4-[5-(2,6-di-tert-butyl-4H-thiopyran-4-ylidene)penta-1,3 -dienyl]thiopyrylium salt of the formula (I) ##STR10## wherein Z.sup..crclbar. represents an anion, and X represents a hydrogen atom, a halogen atom, an alkyl group, or an aryl group, which comprises reacting a 2,6-di-tert-butyl-4-methylthiopyrylium salt of chemical structural formula (II) ##STR11## wherein Z.sup..crclbar. is as defined above, with a 1-phenylamino-3-phenylimino-1-propene of the formula (III) ##STR12## wherein X is as defined above, or with a salt derived from said compound of formula (III) and an acid.
A process for preparing a 2,6-di-tert-butyl-4-[5-(2,6-di-tert-butyl-4H-thiopyran-4-ylidene)penta-1,3 -dienyl]thiopyrylium salt of the formula (I) ##STR13## wherein Z.sup..crclbar. represents an anion, and X represents a hydrogen atom, a halogen atom, an alkyl group or an aryl group, which comprises reacting a 2,6-di-tert-butyl-4-methylthiopyrylium salt of the formula (II) ##STR14## wherein Z.sup..crclbar. is as defined above, with a 1,1,3,3-tetraalkoxypropane of the formula (IV)
- (RO).sub.2 CHCHXCH(OR).sub.2 (IV)
- wherein X is as defined above, and R represents an alkyl group having 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.