| abstract |
NEW MATERIAL:The compound of formula I (R is methyl or ethyl). n EXAMPLE: o-(4-N-n-Butyl-methylamino-2-hydroxybenzoyl)benzoic acid. n USE: Useful as a preparation raw material of a fluoran compound, which has excellent properties as a chromogen for the recording material of pressure-sensitive copying paper, heat-sensitive recording paper, etc. n PROCESS: The compound of formula I can be prepared by reacting the m-amino- phenol derivative of formula II with phthalic anhydride in the absence of solvent or in an inert organic solvent such as toluene, xylene, etc. under heating. The amount of phthalic anhydride is 1W2mol per 1mol of the compound of formula II. The compound of formula II can be obtained by alkylating m-butylaminophenol derived from m-aminophenol or resorcinol. n COPYRIGHT: (C)1984,JPO&Japio |