Yamada Chemical Co., Ltd.

Hideaki Fujisaki

Katsuhiko Tsunemitsu

Seiichi Nieda

Yoshinori Uda

Kozo Mizuno

Yukihiko Sueto

Tadashi Imai

Kouzou Mizuno

Disclosed herein is a novel process for producing 1,1-diphenylalkenes, comprising contacting lead peroxide with 1,1-diphenylalkanes having the structure wherein a nitrogen atom of a tertiary amino group is bonded to the para-position of each of the two benzene rings of the 1,1-diphenylalkane, thereby obtaining the corresponding 1,1-diphenylalkenes.

Process for producing 1,1-diphenylalkenes

Disclosed herein is a novel chromogenic compound of the formula: ##STR1## wherein R represents an alkyl group of 6 to 12 carbon atoms or benzyl group, and ring A and ring B in the quinolyl group may be substituted, a color forming composition containing said chromogenic compound, and pressure- or heat-sensitive recording paper based on said color forming composition.

Chromogenic quinoline compounds

The present invention relates to a novel compound of the formula: ##STR1## wherein R.sup.1 and R.sup.2 respectively represent hydrogen atom, lower alkyl group of 1 to 5 carbon atoms, lower alkoxy group of 1 to 5 carbon atoms or halogen atom; R.sup.3 represents hydrogen atom, alkyl group of 1 to 12 carbon atoms, alkoxyalkyl group of 1 to 12 carbon atoms, halogenoalkyl group of 1 to 12 carbon atoms, phenyl group which may be substituted or benzyl group which may be substituted; and m and n are an integer of 1 or 2; providing the R.sup.1 and R.sup.2 do not represent hydrogen atom, methyl group and methoxy group when R.sup.3 represents hydrogen atom or methyl group. Further, the present invention relates to color developing compositions suitable for use in a recording material and pressure- or heat-sensitive recording sheet containing the novel compound of the formula (I).

Chromogenic 1-(3-methoxy-4-alkoxyphenyl)-2-(2'-quinolyl)ethylene

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Kyoto, Japan

Hideaki Fujisaki