| 摘要 |
PURPOSE:The reaction of 3,4-dichloro-3-cyclobutene-1,2-dione with an aniline derivative gives, in high selectivity, the titled compound of high purity which is used as an intermediate of squarylium compounds which are used as photoconductive materials. CONSTITUTION:One equivalent amount of a compound of formula I and more than 1, preferably 2-5 equivalent amount of a compound of formula II (X is H, alkyl which may be substituted, halogen, hydroxyl, phenyl which may be substituted, alkyl-bounded carbonamide or sulfonamide; R1 and R2 are alkyl, phenyl, benzyl, respectively, which may be substituted) are allowed to react at 0-80 deg.C, preferably 0-40 deg.C whereby the objective compound of formula III is obtained. The reaction satisfactorily proceeds, even in the absence of a catalyst and gives the objective compound of higher purity than when a catalyst is employed. When a low-reactivity compound of formula II is employed, the use of 0.1-1 equivalent amount of a Lewis acid is preferred on the basis of the compound of formula I. |
