NEW MATERIAL: A compound of formula I [R1 and R2 are alkyl, cycloalkyl, aralkyl or combined to form an alkylene bridge; R3 is alkyl, cycloalkyl or aralkuyl; Z is a (substituted) alkylene bridge, combined with N and further with hetero atom to be 5-6 substitution; X is O or NR4 (R4 is H, alkyl, aryl, etc.)].

EXAMPLE: Comound of formula II.

USE: Color former in pressure sensitive, thermal recording material.

PROCESS: A compound of formula III (R28 is 1-4C alkyl which can be substituted by electron attracting group such as CN, etc.), is condensed with a compound of formula IV in the presence of a dehydrating agent.