Abstract: 2-(&ohgr;-alkoxycarbonyl alkanoyl)-4-butanolide is produced with a high selectivity and yield through condensation reaction of Y-butyrolactone with a readily available, low-price dicarboxylate as represented by the following general formula: ROOC(CH2)nCOOR wherein n denotes an integer of 8-13, and R denotes an alkyl group or an alkenyl group.

Abstract: 2-(.omega.-alkoxycarbonyl alkanoyl)-4-butanolide can be produced unexpectedly with a high selectivity and yield through condensation reaction of .gamma.-butyrolactone with a highly available, lo.omega.-price dicarboxylate as represented by the following general formula:ROOC(CH2)nCOOR(where n denotes an integer of 7-13, and R denotes an alkyl group or an alkenyl group). Furthermore, a long-chain .omega.-hydroxycarboxylic acid can be produced by subjecting 2-(.omega.-alkoxycarbonyl alkanoyl)-4-butanolide to hydrolysis and decarboxylation and reducing the carbonyl groups in the resultant product into methylene groups.

Abstract: A platinum(II) complex represented by the general formula (A), ##STR1## in which R.sub.1 represents a hydrocarbon radical having 1 to 10 carbon atoms, R.sub.2 and R.sub.3 each represent a hydrogen atom or a hydrocarbon radical of 1 to 10 carbon atoms, or R.sub.2 and R.sub.3, together, may form --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.5 --, and X and Y each represent an ammonia molecule or a monodentate amine having 1 to 7 carbon atoms or X and Y, together, may form a bidentate diamine having 2 to 10 carbon atoms. The compounds are useful for treating a tumor.

Abstract: A novel platinum (II) complex represented by the following formula (A): ##STR1## wherein R.sub.1 represents C.sub.1 -C.sub.5 lower hydrocarbon group, R.sub.2 and R.sub.3 represents hydrogen atom or C.sub.1 -C.sub.3 lower hydrocarbon group, the configuration of 1,2-diaminocyclohexane being cis, trans-l- or trans-d-. Since the platinum (II) complex has a strong anti-tumor activity and its toxicity is low, it is useful as an agent for treating malignant tumor.

Abstract: A platinum complex represented by the formula: ##STR1## where X is ##STR2## wherein R.sup.1 is a (C1-18) alkyl group, a (C1-18)alkenyl group or a group --Z--R.sup.4 in which Z is --CH.dbd.CH-- or a (C1-5)alkylene group, and R.sup.4 is a phenyl group, a hydroxyphenyl group, a (C7-12)alkoxyphenyl group, a halogenophenyl group, a nitrophenyl group, or (C8-13)alkoxycarbonylphenyl group, a cyclohexyl group having a (C1-5)alkyl substituent, ##STR3## R.sup.2 is hydrogen or a (C1-18)alkyl group, R.sup.3 is hydrogen or a (C1-3) alkyl group, R.sup.2 and R.sup.3 are linked together to form a (C2-7)alkylene group; the dotted line indicates that the bond may be either a single bond or a double bond; the chain line indicates a conjugated system; the 1,2-diaminocyclohexane moiety has a cis-, trans-l- or trans-d-configuration; and Y is an anion. This platinum complex is useful in the treatment of tumors.

Abstract: Angelic acid or esters thereof which are useful as perfume materials are prepared by isomerizing tiglic acid or an ester thereof with an organic sulfinic acid as the catalyst, and novel esters of angelic acid represented by the formula ##STR1## wherein R represents 3-hexenyl, 3-methyl-2-butenyl, 3-methyl-3-butenyl, 3-methyl-2-pentenyl, 3-methyl-4-pentenyl, CH.sub.3 (CH.sub.2).sub.l - (in which l is an integer from 5 to 9), cyclopentyl, cyclohexyl, 2-methylpentyl, .alpha.-methylbenzyl, neryl or furfuryl are provided as part of said esters of angelic acid.

Abstract: Provided is a perfume composition containing a straight-chain trans-6-alkenoic acid represented by the general formula ##STR1## wherein n is an integer of 1 to 4.