To obtain new cyanine pigment compound high in reflectivity, excellent in storage stability and useful as a recording material, etc.
A compound of formula I [A is an atom group for completing a benzene ring or naphthalene ring; T is a 2-6C alkylene, etc.; R is a 1-8C alkyl; L is methine, a trivalent group; Xp- is an anion; (p) is 1-3]. For example, a compound of formula II. The compound of formula I is obtained e.g. by reacting 2,3-dichloroquinoxaline with an alkylthioakylamine, reacting the obtained 2,3-bis(alkylthioalkylamino)quinoxaline with acetic anhydride in the presence of an acid, and subsequently reacting the obtained 1,3-bis(alkylthioalkyl)-2- methylimidazo[4,5-b]quinoxalinium salt with 1,1,3,3-tetramethoxypropane, malonic dialdehyde dianil, glutaconic aldehyde dianil hydrochloride, ethyl orthoformate, etc.
TAKAZAWA AKIHIRO
YABE MASAO
KUBO TOSHIAKI
