Abstract: The present invention provides a novel indole carboxylic ester trimer which is characterized by being represented by the following general formula (1): wherein R represents a straight or branched chain alkyl group having 1-6 carbon atoms; n is an integer of 1-4; Xa? represents at least one anion selected from a group of anions having a valency of 1-3 consisting of chloride ion, bromide ion, iodide ion, fluoride ion, nitrate ion, sulfate ion, hydrogen sulfate ion, phosphate ion, borofluoride ion, perchlorate ion, thiocyanate ion, acetic acid ion, propionic acid ion, methanesulfonic acid ion, p-toluenesulfonic acid ion, trifluoroacetic acid ion and trifluoromethanesulfonic acid ion; a represents the ionic valence number of X and is an integer of 1-3; and m is 0-0.5.

Abstract: The present invention provides a novel indole carboxylic ester trimer which is characterized by being represented by the following general formula (1): wherein R represents a straight or branched chain alkyl group having 1-6 carbon atoms; n is an integer of 1-4; Xa? represents at least one anion selected from a group of anions having a valency of 1-3 consisting of chloride ion, bromide ion, iodide ion, fluoride ion, nitrate ion, sulfate ion, hydrogen sulfate ion, phosphate ion, borofluoride ion, perchlorate ion, thiocyanate ion, acetic acid ion, propionic acid ion, methanesulfonic acid ion, p-toluenesulfonic acid ion, trifluoroacetic acid ion and trifluoromethanesulfonic acid ion; a represents the ionic valence number of X and is an integer of 1-3; and m is 0-0.5.

Abstract: The present invention provides a process for producing a 2-substituted benzo[b]thiophene, which is characterized by reacting a substituted or unsubstituted 2-halogenobenzaldehyde with sulfur and a compound represented by general formula (1)H.sub.i S.sub.j M.sub.k (1)(wherein M represents an alkali metal; i represents an integer of 0 or 1; j represents an integer of 1 or more; and k represents an integer of 1-2 with a proviso that i+k=2), or with a compound of general formula (1) wherein j is 2 or more, in the presence of an aprotic polar solvent, and then reacting the reaction mixture with a compound represented by general formula (2)XCH.sub.2 R (2)(wherein X represents a halogen atom; and R represents an acyl group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted arylcarbonyl group or a cyano group) to give rise to intramolecular ring closure.

Abstract: A process for production of 2-acetylbenzo[b]thiophene represented by the formula (I): ##STR1## comprising the steps of: (1) reacting 2-halogenobenzaldehyde represented by the formula (II): ##STR2## wherein X represents a halogen atom, with a compound represented by the formula (III):H.sub.i S.sub.j M.sub.kwherein M represents an alkali metal, i represents zero or 1, j represents an integer of at least 1, and k represents an integer of 1 or 2, and preferably also with sulfur; and(2) reacting the reaction product with a monohalogenoacetone represented by the formula (IV) ##STR3## wherein X.sup.1 represents a halogen atom.

Abstract: The present invention provides a process for producing a halomethyl ester of an aliphatic carboxylic acid in which a metal salt of an aliphatic carboxylic acid is reacted with a dihalomethane in the presence of a phase transfer catalyst, whereby the efficient production of a halomethyl ester of an aliphatic carboxylic acid has been made possible without the formation of a halomethyl ether as a by-product. The bis compound bis[aliphatic carbonyloxy)methane], which is obtained as a by-product, is hydrolyzed to enable the quantitative recovery of an aliphatic carboxylic acid and its reuse. Thus, the present process is preferable as a process for industrial production of a halomethyl ester of an aliphatic carboxylic acid.

Abstract: A process for production of 2-acetylbenzo[b]thiophene represented by the formula (I): ##STR1## comprising the steps of: (1) reacting 2-halogenobenzaldehyde represented by the formula (II): ##STR2## wherein X represents a halogen atom, with a compound represented by the formula (III):H.sub.i S.sub.j M.sub.kwherein M represents an alkali metal, i represents zero or 1, j represents an integer of at least 1, and k represents an integer of 1 or 2, and preferably also with sulfur; and(2) reacting the reaction product with a monohalogenoacetone represented by the formula (IV) ##STR3## wherein X.sup.1 represents a halogen atom.

Abstract: A process for producing a halomethyl pivalate which comprises reacting an aqueous solution of a metal salt of pivalic acid with a dihalomethane selected from the group consisting of bromochloromethane, chloroiodomethane and bromoiodomethane in the presence of a phase transfer catalyst.