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US 4,058,544 AGranted
Novel method for preparing organotin compounds
AssigneeM&T Chemicals Inc.
InventorBernard G. Kushlefsky
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Abstract
Triorganotin derivatives of polymerizable ethylenically unsaturated carboxylic acids are prepared either in the presence or absence of solvent by reacting the acid or a suitable derivative thereof with a triorganotin hydroxide or a bis(triorganotin)oxide. Polymerization of the acid or the triorganotin derivative thereof is avoided by using a dehydrating agent to remove the water formed as a by-product of the reaction.
Claims7
In an improved method for preparing a triorganotin derivative of an ethylenically unsaturated mono- or dicarboxylic acid containing between 3 and 20 atoms, the method consisting essentially of
- 1. reacting said mono- or dicarboxylic acid with a stoichiometric amount of a triorganotin hydroxide or a bis(triorganotin)oxide;
- 2. removing the water formed as a by-product of the reaction from the reaction mixture;
- and
- 3. isolating said triorganotin derivative, wherein the improvement resides in removing the water by maintaining the triorganotin derivative in contact with an amount of a solid, chemically inert dehydrating agent sufficient to remove all of the water present in the reaction mixture, and separating said triorganotin derivative from the dehydrating agent, said dehydrating agent being selected from the group consisting of the anhydrous forms of sodium sulfate, magnesium sulfate, calcium sulfate, the calcium halides, activated alumina, silica gel and molecular sieves.
1 more element
Dependencies are inferred from the claim text.