| 摘要 |
PURPOSE:To obtain a trimethine dye useful as an intermediate for an electron- donative leuco dye for to recording material using an inexpensive raw material with small number of steps by reacting a specific aniline compound with a tetraalkoxypropane in the presence of acetic anhydride, a protonic acid and an amine base. CONSTITUTION:This dye of formula III (X<-> is a counter ion) can be produced by reacting an aniline compound of formula I (R1 and R2 are each an alkyl or an aryl; R3 to R67 each is H, an alkyl, an alkoxy or a halogen) with a 1,1,3,3- tetraalkoxypropane preferably at an equivalent ratio of 1: (0.5-3) in the presence of acetic anhydride, a protonic acid (preferably hydrogen borofluoride) and a compound of formula II (R7 to R9 each is H, an alkyl; or a cycloalkyl; at least one of R7 to R9 is not H; R7 and R8 may together form a 5 to 7-menbered ring). |
