Dehydrogenative coupling can be achieved in nearly quantitative conversions and yields using a membrane reactor.

Dehydrogenative coupling can be achieved in nearly quantitative conversions and yields using a membrane reactor.

Dehydrogenative coupling can be achieved in nearly quantitative conversions and yields using a membrane reactor.

A method for esterification of one or more carboxylic acid groups in a compound containing one or more carboxylic acid groups wherein the esterification reagent is a diazo-compound of formula: ##STR00001##
wherein the R.sub.1 and R.sub.2 groups of the diazo compound are selected such that the corresponding organic compound of formula: ##STR00002##
exhibits a CH pKa value between 18 and 29 as measured in DMSO. Specific reagents and methods for esterification are provided. The esterification reagents provided exhibit high selectivity for esterification of carboxylic acid groups over reaction with amine, alcohol or thiol groups in the compound containing one or more carboxylic acid groups. The method can be used to selectively esterify carboxylic acid groups in peptides or proteins.

A method for esterification of one or more carboxylic acid groups in a compound containing one or more carboxylic acid groups wherein the esterification reagent is a diazo-compound of formula: ##STR00001##
wherein the R.sub.1 and R.sub.2 groups of the diazo compound are selected such that the corresponding organic compound of formula: ##STR00002##
exhibits a CH pKa value between 18 and 29 as measured in DMSO. Specific reagents and methods for esterification are provided. The esterification reagents provided exhibit high selectivity for esterification of carboxylic acid groups over reaction with amine, alcohol or thiol groups in the compound containing one or more carboxylic acid groups. The method can be used to selectively esterify carboxylic acid groups in peptides or proteins.

The purpose of the present invention is to provide a maintenance method for restoring the flexibility of a surface layer of a bowling ball in which the flexibility of the surface layer is lost by volatilization or elution of a plasticizer. In order to solve the above-mentioned problems, a maintenance method of bowling ball is provided, characterized in that a plasticizer is applied to a surface layer of the bowling ball.

The present invention relates to novel Ruthenium complexes of formulae A1-A4 and their use, inter alia, for (1) dehydrogenative coupling of alcohols to esters; (2) hydrogenation of esters to alcohols (including hydrogenation of cyclic esters (lactones) or cyclic di-esters (di-lactones), or polyesters); (3) preparing amides from alcohols and amines(including the preparation of polyamides (e.g., polypeptides) by reacting dialcohols and diamines and/or polymerization of amino alcohols and/or forming cyclic dipeptides from p-aminoalcohols; (4) hydrogenation of amides (including cyclic dipeptides, polypeptides and polyamides) to alcohols and amines; (5) hydrogenation of organic carbonates (including polycarbonates) to alcohols or hydrogenation of carbamates (including polycarbamates) or urea derivatives to alcohols and amines; (6) dehydrogenation of secondary alcohols to ketones; (7) amidation of esters (i.e., synthesis of amides from esters and amines); (8) acylation of alcohols using esters; (9) coupling of alcohols with water and a base to form carboxylic acids; and (10) preparation of amino acids or their salts by coupling of amino alcohols with water and a base. The present, invention further relates to the use of certain known Ruthenium complexes for the preparation of amino acids or their salts from amino alcohols.

The present invention relates to novel Ruthenium complexes of formulae A1-A4 and their use, inter alia, for (1) dehydrogenative coupling of alcohols to esters; (2) hydrogenation of esters to alcohols (including hydrogenation of cyclic esters (lactones) or cyclic di-esters (di-lactones), or polyesters); (3) preparing amides from alcohols and amines(including the preparation of polyamides (e.g., polypeptides) by reacting dialcohols and diamines and/or polymerization of amino alcohols and/or forming cyclic dipeptides from p-aminoalcohols; (4) hydrogenation of amides (including cyclic dipeptides, polypeptides and polyamides) to alcohols and amines; (5) hydrogenation of organic carbonates (including polycarbonates) to alcohols or hydrogenation of carbamates (including polycarbamates) or urea derivatives to alcohols and amines; (6) dehydrogenation of secondary alcohols to ketones; (7) amidation of esters (i.e., synthesis of amides from esters and amines); (8) acylation of alcohols using esters; (9) coupling of alcohols with water and a base to form carboxylic acids; and (10) preparation of amino acids or their salts by coupling of amino alcohols with water and a base. The present, invention further relates to the use of certain known Ruthenium complexes for the preparation of amino acids or their salts from amino alcohols.

A method of isomerizing methyl 9-decenoate in a reaction mixture, and forming methyl 8-decenoate, and reacting the methyl 8-decenoate by metathesis to form 1,16-dimethyl 8-hexadecenedioate, and hydrogenating 1,16-dimethyl 8-hexadecenedioate to form 1,16-dimethyl hexadecanedioate. In some embodiments, the 1,16-dimethyl hexadecanedioate can be converted to hexadecanedioic acid.

A method of isomerizing methyl 9-decenoate in a reaction mixture, and forming methyl 8-decenoate, and reacting the methyl 8-decenoate by metathesis to form 1,16-dimethyl 8-hexadecenedioate, and hydrogenating 1,16-dimethyl 8-hexadecenedioate to form 1,16-dimethyl hexadecanedioate. In some embodiments, the 1,16-dimethyl hexadecanedioate can be converted to hexadecanedioic acid.