An industrially useful process for producing benzofuran derivatives of formula (1): ##STR1## by formylating a compound of formula (2): ##STR2## (where A.sub.1 is a protective group), followed by reaction with a compound of formula (4): ##STR3## (where X.sub.1 is a halogen atom), then performing a cyclizing reaction and subsequently performing a reaction for hydroxyl group deprotection.

A process for preparing 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran in which 2-methallyloxyphenol is heated to a temperature in the range of 150.degree. C. to 250.degree. C. in the presence of a solvent and a Lewis acid catalyst under an autogenous pressure of 20 to 60 psig is disclosed and exemplified.

The present invention relates to the process for the preparation and purification of citalopram (I) ##STR1## in which a compound of formula (II) ##STR2## wherein Z is iodo, bromo, chloro or CF.sub.3 --(CF.sub.2).sub.n --SO.sub.2 --O--, n being 0, 1, 2, 3, 4, 5, 6, 7 or 8, is subjected to a cyanide exchange reaction with a cyanide source; the resultant crude citalopram product is optionally subjected to some initial purification and subsequently treated with an amide or an amide-like group formin...

A substituted carboxylic acid derivative which is fungicidally active is provided. The compound has the formula: ##STR1## wherein R.sub.1 stands for a methyl or ethyl group, A stands for ##STR2## R.sub.2 stands for a methyl, ethyl or trifluoromethyl group, R.sub.3 stands for a methyl group or a halogen or hydrogen atom, R.sub.4 stands for a fluorine or hydrogen atom, R.sub.5 stands for a methyl, nitro or trifluoromethyl group or a halogen atom, Z stands for a .dbd.CH-- group or an N atom, R.sub....

A process for preparing 2,3-dihydro-7-aminobenzofurans by reaction between 2,3-dihydro-7-halobenzofurans and ammonia in the presence of a copper catalyst, is described. The 2,3-dihydro-7-aminobenzofurans are useful as intermediates for insecticides.

A process for preparing 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran which comprises subjecting o-methallyloxyphenol to a rearrangement and cyclization reactions in the presence of, as a catalyst, aluminum halide and N-substituted aniline derivative, or a complex of both these compounds.

Esters of 2-(2-chlorocarbonyl)-2-(2,3-dihydro-2-alkylbenzofuran-7-yl)hydrazinecarbox ylic acid, useful as pesticides and/or as percursors to pesticides.

A process for preparing 2,2-dimethyl-2,3-dihydro-7-hydroxybenzofuran, which comprises (a) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl)cyclohexanone in the presence of a dehydrohalogenation agent, hydroylzing the resulting 2-isobutenyl-6-halophenol in the presence of a copper compound catalyst and an alkali, and cyclizing the resulting 1,2-dihydroxy-3-isobutenylbenzene in the presence of a cyclization catalyst, (b) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl) cyclohexanone in the presence of ...

A process is provided for preparing a substituted 2,3-dihydrobenzofuran of the general formula ##STR1## in which R.sub.a is hydrogen, halogen, alkyl, straight or branched having from 1 to 4 carbon atoms, aryl, alkaryl, --OH, --OR.sub.3, --N(R.sub.d).sub.2, where R.sub.3 and R.sub.d are alkyl, straight or branched having from 1 to 4 carbon atoms; R.sub.b is alkyl, straight or branched, having from 1 to 6 carbon atoms, aryl, alkaryl; and R.sub.c is hydrogen or the same as R.sub.b, by the rearrange...

A process for the preparation of a 2,3-dihydro-2-methyl-2,3-dialkyl-7-oxybenzofuran having the formula (I): ##STR1## in which R and R' are the same or different and each represents a lower alkyl group or hydrogen atom, which comprises reacting catechol with an aldehyde having the formula (II): or an alcohol having the formula (III): in a gaseous phase in the presence of a solid acid catalyst. The products are useful as intermediates in the preparation of insecticides.