Abstract: A hair dye containing a compound represented by the following general formula (I): wherein R1 and R2 each independently represent a hydrogen atom or a straight chain or branched alkyl group having 1 to 5 carbon atoms, and An? represents an inorganic anion, an organic anion, or a complex salt anion, respectively.

Abstract: A hair dye containing a compound represented by the following general formula (I): wherein R1 and R2 each independently represent a hydrogen atom or a straight chain or branched alkyl group having 1 to 5 carbon atoms, and An? represents an inorganic anion, an organic anion, or a complex salt anion, respectively.

Abstract: A novel fluoran compound represented by the formula (I): ##STR1## is disclosed. By using the novel fluoran compound (I) as a chromogenic substance, a pressure-sensitive record material is provided which can develop an image of a clear vermilion color when it contacts a developer of an acidic substance.

Abstract: A novel cycloalkene compound represented by the following general formula [1]: ##STR1## wherein each of R.sup.1 and R.sup.2 is a C.sub.1 -C.sub.4 alkyl group, R.sup.3 is a hydrogen atom , or a C.sub.1 -C.sub.4 alkyl group, R.sup.4, together with R.sup.5, forms --CH.sub.2 --CH.sub.2 --or --CH.sub.2 --CH.sub.2 --CH.sub.2 --, and R.sup.6 is a C.sub.1 -C.sub.4 alkyl group.

Abstract: A heat sensitive recording sheet having a heat sensitive color forming layer wherein a mixture of fluoran compounds of the following formulas I and II is used as a color former; ##STR1## wherein R.sub.1 is a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, a tetrahydrofurfuryl group, a substituted or unsubstituted phenyl group or a cycloalkyl group, R.sub.2 is a hydrogen atom, a chlorine atom, a fluorine atom, a lower alkyl group, a lower alkoxy group, a lower alkoxyalkyl group, a phenyl group or a benzyl group, and R.sub.3 is a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a lower alkyl group or an acyl group; and ##STR2## wherein each of R.sub.4 and R.sub.5 is a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, a substituted or unsubstituted phenyl group or a cycloalkyl group, or R.sup.4 and R.sub.5 may, together with the adjacent nitrogen atom, form a ring of the formula ##STR3## each of R.sub.6 and R.sub.

Abstract: A novel 6-tetrahydrofurfurylaminofluoran compound useful as a color former (precursory colorant) for a heat-sensitive recording sheet is of the formula (I): ##STR1## wherein R.sub.1 is H, C.sub.1-8 alkyl, tetrahydrofurfuryl, phenyl alkyl(C.sub.1-5)phenyl, or C.sub.3-8 cyclic alkyl, R.sub.2 is H, Cl, F, C.sub.1-5 alkyl, C.sub.1-5 alkoxy, C.sub.2-10 alkoxyalkyl, phenyl or benzyl, and R.sub.3 is H, Cl, F, C.sub.1-5 alkyl and C.sub.2-7 acryl.

Abstract: A fluoran compound having the formula: ##STR1## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom, a straight chain or branched alkyl group having from 1 to 8 carbon atoms, a cyclohexyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted benzyl group, Q is ##STR2## (wherein X is a hydrogen atom, a halogen atom, or a straight chain or branched alkyl group having from 1 to 8 carbon atoms), ##STR3## (wherein X is as defined above), or --(CH.sub.2).sub.n OR.sub.4 (wherein R.sub.4 is a straight chain or branched alkyl group having from 1 to 8 carbon atoms, a cycloalkyl group, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted benzyl group, and n is an integer of from 1 to 8), and R.sub.3 is a hydrogen atom, a halogen atom, a lower fluoroalkyl group, an acyl group, an alkoxy group, an alkoxyalkyl group, or a straight chain or branched alkyl group having from 1 to 8 carbon atoms.

Abstract: A novel 6-tetrahydrofurfurylaminofluoran compound useful as a color former (precursory colorant) for a heat-sensitive recording sheet is of the formula (I): ##STR1## wherein R.sub.1 is H, C.sub.1-8 alkyl, tetrahydrofurfuryl, phenyl, alkyl(C.sub.1-5)phenyl, or C.sub.3-8 cyclic alkyl, R.sub.2 is H, Cl, F, C.sub.1-5 alkyl, C.sub.1-5 alkoxy, C.sub.2-10 alkoxyalkyl, phenyl or benzyl, and R.sub.3 is H, Cl, F, C.sub.1-5 alkyl and C.sub.2-7 acryl.