Verfahren zur Herstellung von Organodizinnverbindungen

摘要

Bis(dialkyltin carboxylates) and bis(diaryltin carboxylates) of formula where R (which may be the same or different) and R1 (which may be the same or different) represent C1-C18 alkyl or monocyclic aryl groups, and R1 may be additionally substituted by carboxy or hydroxy groups or halogen atoms, are used as heat and light stabilizers for polyvinyl chloride compositions.ALSO:The invention comprises bis(dialkyl tin carboxylates) and bis(diaryl tin carboxylates) of formula where R (which may be the same or different) and R1 (which may be the same or different) represent alkyl or monocyclic aryl groups containing 1 to 18 carbon atoms. R1 additionally may be substituted by carboxy or hydroxy groups or halogen atoms. They may be prepared by reacting a di-substitutedtin dihydride R2SnH2 with a carboxylic acid R1COOH: 2R2SnH2 + 2R1COOH --> R2Sn(COOR1)Sn (COOR1)R2 + 3H2 Under some conditions, a disubstituted-tin diacylate may be produced R2SnH2 + 2R1COOH --> R2Sn(COOR1)2 + 2H2. The disubstituted-tin acylate may be further reacted with disubstituted-tin dihydride: R2SnH2 + R2Sn(COOR1)2 --> R2Sn(COOR1)Sn(COOR1)R2 + H2 Mixed and/or unsymmetrical compounds may be produced by using mixtures of tindihydrides (R32SnH2 + R42SnH2 or R3R4SnH2) and/or mixtures of carboxylic acids. Solvents such as diethylether, heptane, hexane, toluene, benzene, cyclohexane or chloroform may be used when the reagents are not liquids. The reaction may be conducted in an inert atmosphere, e.g. nitrogen. An additional method of preparation consists in reacting a disubstituted tin compound R2Sn with an acyl peroxide (R1C(O)OO)2. The products may be used as heat and light stabilizers for polyvinyl chloride composititions (see Group IV(a)), and as biocides.