Divinyl carbinol or carbinol derivative chromogenic compounds

Abstract

A chromogenic compound for use in pressure- or heatsensitive record material has the general formula (I): R.sub.1 --CH.dbd.CH--CR.sub.3 (OR.sub.4)--CH.dbd.CH--R.sub.2 (I) in which: R.sub.1 and R.sub.2 are the same or different and each is a group of one of the formulae (II): ##STR1## in which the benzene ring of the group of formula (IIa) is optionally further substituted, and in which: R.sub.10 and R.sub.11 are each independently hydrogen or an optionally-substituted alkyl, aryl or aralkyl group, or R.sub.10 and R.sub.11 together with the nitrogen atom to which they are attached form an optionally-substituted heterocyclic ring, which may include one or more further hetero atoms; R.sub.12, R.sub.13 and R.sub.14 are each independently hydrogen or an optionally-substituted alkyl, aryl or aralkyl group; R.sub.3 is an optionally-substituted aryl group; and R.sub.4 is hydrogen or an optionally-substituted alkyl, aryl or aralkyl group.

Dependencies are inferred from the claim text.