Abstract: There is provided a process for producing 3,3-dimethyl-2-formylcyclopropanecarboxylic ester of formula (1): wherein R represents an alkyl group, a cycloalkyl group or an optionally substituted aralkyl group, which comprises reacting chrysanthemic acid ester of formula (2): wherein R represents the same meaning as that described above, with hydrogen peroxide in the presence of at least one catalyst selected from tungstic oxide, tungstic acid, tugstate, alkylrhenium trioxide, molybdic oxide, molybdate, a heteropoly acid comprising a hetero atom selected from a phosphorus, boron or silicone atom and a poly atom selected from tungsten or molybdenum and a salt of said heteropoly acid.

Abstract: There are disclosed are a method for producing at least one compound selected from a carbonyl compound and a hydroxy adduct compound by an oxidative cleavage or addition reaction of an olefinic double bond of an olefin compound,

Abstract: There is provided a process for producing 3,3-dimethyl-2-formylcyclopropanecarboxylic ester of formula (1): 1

Abstract: There is disclosed an optically active salicylideneaminoalcohol compound of formula (1): 1

Abstract: There is disclosed an N-(.alpha.-alkylbenzylidene)-.alpha.-phenylalkylarmine represented by the general formula (1): ##STR1## wherein R.sup.1 represents a lower alkyl group, R.sup.2 represents a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group and X represents a halogen atom or a lower alkoxy group, its use and a process for producing the same and processes for producing intermediates therefor.

Abstract: There is disclosed an N-(.alpha.-alkylbenzylidene)-.alpha.-phenylalkylamine represented by the general formula (1): ##STR1## wherein R.sup.1 represents a lower alkyl group, R.sup.2 represents a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group and X represents a halogen atom or a lower alkoxy group, its use and a process for producing the same and processes for producing intermediates therefor.

Abstract: A process for racemization of an optically active 1-phenylethylamine derivative represented by formula (I): ##STR1## wherein R.sup.1 represents a phenyl group substituted at least at the ortho-position, which comprises reacting the optically active 1-phenylethylamine derivative (1) with an aldehyde compound represented by formula (2):R.sup.2 --CHO (2)where R.sup.2 represents an optionally substituted alkyl group or an optionally substituted phenyl group to form an optically active imine represented by formula (3): ##STR2## reacting the imine with an alkaline metal tert-alkoxide in an aprotic solvent, and then hydrolyzing the resultant racemic imine.

Abstract: Racemic dihalovinylcyclopropane carboxylic acid halides, which are intermediates of such insecticides as permethrin, cypermethrin etc., are prepared by allowing phosphorus iodides, silicon iodides or boron iodides to react with optically active dihalovinylcyclopropane carboxylic acid halides of the formula: ##STR1## wherein X and Y stand for halogen atoms and the mark * indicates an asymmetric carbon atom.

Abstract: Trans-2,2-dimethyl-3-(2,2-dihalovinyl)-cyclopropane carboxylic acid halides which are an intermediate for insecticides are prepared by allowing arylphosphines to react with cis- or cis-/trans-mixed 2,2-dimethyl-3-(2,2-dihalovinyl)-cyclopropane carboxylic acid halides of the formula ##STR1## wherein both X and Y are halogen atoms, respectively, at a temperature of -10.degree. to 100.degree. C., in the presence of absence of halogen compounds.

Abstract: Trans-2,2-dimethyl-3-(2,2-dihalovinyl)-cyclopropane carboxylic acid esters which are intermediate of insecticides are prepared by allowing (1) alkali metal alkoxides and titanium alkoxides or (2) silicon iodides to react with cis- or cis-/trans-mixed 2,2-dimethyl-3-(2,2-dihalovinyl)-cyclopropane carboxylic acid esters of the formula ##STR1## wherein X is a halogen atom and R is an alkyl, cycloalkyl or aralkyl group having 1-10 carbon atoms.

Abstract: Optically active chrysanthemic acid or its derivatives of the formula ##STR1## (wherein X represents a hydroxyl group, a halogen atom, a C.sub.1-20 alkoxy group or a 2,2-dimethyl-3-isobutenyl-cyclopropane carboxyl group and * mark shows asymmetric carbon atom) is racemized by allowing it to react with a bromine compound or a SH compound, in the presence of light.

Abstract: Racemization of optically active chrysanthemic acid or its ester of the formula: ##STR1## wherein R represents a hydrogen atom or an alkyl, cycloalkyl or aralkyl group of 1-20 carbon atoms and * indicates an asymmetric carbon atom, is effected by contacting it with hydrogen bromide or a phosphorus bromide compound. This method may also be effected in the presence of a peroxide or an azo compound. This method is industrially very useful.