CHARGE-TRANSFER SUBSTANCE AND PROCESS FOR PRODUCING THE SAME, ELECTRON-TRANSFER AGENT COMPRISING CHARGE-TRANSFER SUBSTANCE, ELECTROPHOTOGRAPHIC PHOTORECEPTOR, AND ORGANIC ELECTROLUMINESCENT ELEMENT

摘要

A compound represented by the following general formula (1): (1) (wherein R1 to R4 each is hydrogen or a substituent selected from the group consisting of cyano, nitro, halogeno, hydroxy, alkyl, aryl, heterocycle, ester, alkoxy, aralkyl, allyl, amide, amino, acyl, alkenyl, alkynyl, carboxyl, carbonyl, and a carboxylic acid group; substituent X is one member selected from the group consisting of oxygen, sulfur, and =C(CN)2; and substituent W is a 4- to 8-membered ring) is incorporated as an electron-transfer agent into a photosensitive layer.