Method for preparing organotin compounds

Claim 1

A method for preparing an organotin compound of the general formula ##STR3## wherein R and R' are individually selected from the group consisting of alkyl containing from 1 to 20 atoms, cycloalkyl, aryl, alkaryl and aralkyl, m represents the integer 2 or 3 and q represents the integer 1 or 2, said method consisting essentially of the following sequence of steps: (1) combining 4-q moles of 2-mercaptoethanol or 3-mercaptopropanol for every one mole of an organostannoic acid, RSnOOH, when q is 1 or a diorganotin oxide, R 2 SnO, when q is 2, and heating the resultant mixture at a temperature of from 40° to 100° C and for a period of time sufficient to substantially complete the reaction; (2) combining the resultant product with a stoichiometric quantity of a carboxylic acid R'COOH, or an ester thereof, R'COOR", wherein R" is alkyl and contains from 1 to 20 carbon atoms, and subsequently removing the aqueous phase of the reaction mixture; (3) heating the organic phase of said reaction mixture to a temperature of from 100° to about 180° C and simultaneously removing any by-product water or any alcohol boiling at or below the temperature of the reaction mixture; (4) removing the resultant organotin compound, ##STR4## from the reaction vessel.

Claim 2

A method for preparing an organotin compound of the general formula ##STR3## wherein R and R' are individually selected from the group consisting of alkyl containing from 1 to 20 atoms, cycloalkyl, aryl, alkaryl and aralkyl, m represents the integer 2 or 3 and q represents the integer 1 or 2, said method consisting essentially of the following sequence of steps: (1) combining 4-q moles of 2-mercaptoethanol or 3-mercaptopropanol for every one mole of an organostannoic acid, RSnOOH, when q is 1 or a diorganotin oxide, R 2 SnO, when q is 2, and heating the resultant mixture at a temperature of from 40° to 100° C and for a period of time sufficient to substantially complete the reaction; (2) combining the resultant product with a stoichiometric quantity of a carboxylic acid R'COOH, or an ester thereof, R'COOR", wherein R" is alkyl and contains from 1 to 20 carbon atoms, and subsequently removing the aqueous phase of the reaction mixture; (3) heating the organic phase of said reaction mixture to a temperature of from 100° to about 180° C and simultaneously removing any by-product water or any alcohol boiling at or below the temperature of the reaction mixture; (4) removing the resultant organotin compound, ##STR4## from the reaction vessel.

Claim 11

A method for preparing an organotin compound of the general formula ##STR5## wherein R and R' are individually selected from the group consisting of alkyl containing from 1 to 20 carbon atoms, cycloalkyl, aryl, alkaryl and aralkyl, m is the integer 2 or 3 and q is the integer 1 or 2, said method consisting essentially of the following sequence of steps: (1) reacting an organotin halide of the formula R q SnX 4-q wherein X is chlorine, bromine or iodine with (a) an aqueous solution of an inorganic base at ambient temperature, such that the number of equivalent weights of said base is at least equal to the number of moles of X atoms present in the reaction mixture; (2) combining the resultant product with 4-q moles of 2-mercaptoethanol or 3-mercaptopropanol, and heating the mixture to a temperature of from 40° to 100° C and for a period of time sufficient to substantially complete said reaction; (3) combining the resultant product with a stoichiometric quantity of a carboxylic acid R'COOH, or an ester thereof, R'COOR", wherein R" is alkyl and contains from 1 to 20 carbon atoms, and subsequently removing the aqueous phase of the reaction mixture; (4) heating the organic phase of said reaction mixture to a temperature of from 100° to about 180° C and simultaneously removing any by-product water or any alcohol boiling at or below the temperature of the reaction mixture; (5) removing the resultant organotin compound, ##STR6## from the reaction vessel.

Claim 12

A method for preparing an organotin compound of the general formula ##STR5## wherein R and R' are individually selected from the group consisting of alkyl containing from 1 to 20 carbon atoms, cycloalkyl, aryl, alkaryl and aralkyl, m is the integer 2 or 3 and q is the integer 1 or 2, said method consisting essentially of the following sequence of steps: (1) reacting an organotin halide of the formula R q SnX 4-q wherein X is chlorine, bromine or iodine with (a) an aqueous solution of an inorganic base at ambient temperature, such that the number of equivalent weights of said base is at least equal to the number of moles of X atoms present in the reaction mixture; (2) combining the resultant product with 4-q moles of 2-mercaptoethanol or 3-mercaptopropanol, and heating the mixture to a temperature of from 40° to 100° C and for a period of time sufficient to substantially complete said reaction; (3) combining the resultant product with a stoichiometric quantity of a carboxylic acid R'COOH, or an ester thereof, R'COOR", wherein R" is alkyl and contains from 1 to 20 carbon atoms, and subsequently removing the aqueous phase of the reaction mixture; (4) heating the organic phase of said reaction mixture to a temperature of from 100° to about 180° C and simultaneously removing any by-product water or any alcohol boiling at or below the temperature of the reaction mixture; (5) removing the resultant organotin compound, ##STR6## from the reaction vessel.