Ricoh Company, Ltd.

Kanebo, Limited

Mitsuo Okazaki

Akihiro Yamaguchi

Masaomi Sasaki

Goro Tsukamoto

Akio Kozima

Koichiro Yoshino

Takashi Nose

Tominori Morita

A phosphonic acid ester of the formula: ##STR1## and R is a lower alkyl, exhibits a calcium-antagonistic activity. Pharmaceutical compositions containing the same are useful in prophylaxis and treatment of ischemic heart diseases such as angina pectoris, myocardial, infarction, etc. and hypertension.

Calcium-antagonistic composition

1,3,4-oxadiazole derivative expressed by the general formula ##STR1## wherein R represents alkyl having 1-4 carbon atoms, dialkylamino having 1-4 carbon atoms, diarylamino, phenyl, styryl, halogenophenyl, nitrophenyl, alkylphenyl having 1-4 carbon atoms, alkoxyphenyl having 1-4 carbon atoms, cyanophenyl, carboxylic ester substituted phenyl, dialkylaminophenyl having 1-4 carbon atoms, naphthyl, anthryl, or heterocyclic radical, is a photoconductive substance with high sensitivity and is a compound useful as a constituent of electrophotographic plate.

1,3,4-Oxadiazole derivatives and use thereof

1,3,4-OXADIAZOLE DERIVATIVES EXPRESSED BY THE GENERAL FORMULA ##STR1## , wherein R represents cyanophenyl, nitrophenyl, dialkylaminophenyl (wherein alkyl has 1-4 carbon atoms), julolidyl, N-alkylcarbazolyl (wherein alkyl has 1-4 carbon atoms) or ferrocenyl radical, are photoconductive substances possessing high sensitivity and are compounds useful as a constituent of electrophotographic plates.

Derivatives of 1,3,4-oxadiazole and electrophotographic elements

1,3,4-OXADIAZOLE DERIVATIVES EXPRESSED BY THE GENERAL FORMULA ##STR1## wherein R represents cyanophenyl, nitrophenyl, dialkylaminophenyl (wherein alkyl has 1-4 carbon atoms), julolidyl, N-alkylcarbazolyl (wherein alkyl has 1-4 carbon atoms) or ferrocenyl radical are photoconductive substances possessing high sensitivity and are compounds useful as a constituent of electrophotographic plates.

1,3,4-OXADIAZOLE DERIVATIVE EXPRESSED BY THE GENERAL FORMULA ##STR1## wherein R represents alkyl having 1-4 carbon atoms, dialkylamino having 1-4 carbon atoms, diarylamino, phenyl, styryl, halogenophenyl, nitrophenyl, alkylphenyl having 1-4 carbon atoms, alkoxyphenyl having 1-4 carbon atoms, cyanophenyl, carboxylic ester substituted phenyl, dialkylaminophenyl having 1-4 carbon atoms, naphthyl, anthryl, or heterocyclic radical, is a photoconductive substance with high sensitivity and is a compound useful as a constituent of electrophotographic plate.

1,3,4-Oxadiazole derivatives and electrophotographic plates containing

3-(-FLUORENYLIDENE)CARBAZOLE DERIVATIVES, PROCESS FOR PREPARING SAME AND ELECTROPHOTOGRAPHIC LIGHT-SENSITIVE MATERIAL CONTAINING 3-(9-FLUORENYLIDENE)CARBAZOLE DERIVATIVES.

3-(9-Fluorenylidene)carbazole derivatives and electrophotographic

1,3,4-Oxadiazle derivatives expressed by the general formula ##STR1## wherein R represents cyanophenyl, nitrophenyl, dialkylaminophenyl (wherein alkyl has 1 - 4 carbon atoms), julolidyl, N-alkylcarbazoyl (wherein alkyl has 1 - 4 carbon atoms) or ferrocenyl radical are photoconductive substances possessing high sensitivity and are compounds useful as a constituent of electrophotographic plates.

.alpha.-(9-Anthryl)-.beta.-(3-carbazolyl)ethylene derivatives, process for preparing same and electrophotographic light-sensitive materials containing .alpha.-(9-anthryl)-.beta.-(3-carbazolyl)ethylene derivative.

.alpha.-(9-Anthryl)-.beta.-(3-carbazolyl)ethylene derivatives

1,3,4-OXADIAZOLE DERIVATIVES EXPRESSED BY THE GENERAL FORMULA ##STR1## wherein R represents cyanophenyl, nitrophenyl, dialkylaminophenyl (wherein alkyl has 1-4 carbon atoms), julolidyl, N-alkylcarbazolyl (wherein alkyl has 1-4 carbon atoms) or ferrocenyl radical, are photoconductive substances possessing high sensitivity and are compounds useful as a constituent of electrophotographic plates.

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Tama, Japan

Mitsuo Okazaki