Silacrown ethers, method of making same, and use as phase-transfer catalysts
AssigneePetrarch Systems Inc.
InventorBarry C. Arkles
Life of this patent
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Abstract
Organosilicon compounds referred to as silacrown ethers or "silacrowns" are of the general formula: ##STR1## where R.sup.1 and R.sup.2 are organic radicals or hydrogen and n is an integer between 4 and 10 inclusive. Silacrown ethers are prepared by reacting polyethylene glycol with substituted silanes under conditions promoting cyclization over polymerization. Silacrown ethers may be employed as phase-transfer catalysts in solution or immobilized on siliceous supports.
Claims12
Compounds of the structure:
- ##STR7## wherein n is an integer from 4 to 10 inclusive, and R.sup.1 and R.sup.2 are selected from the group consisting of alkyl, unsaturated alkyl, alkoxy, aryl and hydrogen.
A method for producing silacrown ethers by a transesterification reaction between a polyethylene glycol having the general formula:
- HO(CH.sub.2 CH.sub.2 O).sub.n H
- where n is an integer from 4 to 10 inclusive, and a silane having the general formula:
- R.sup.1 R.sup.2 Si(Y).sub.2
- in the presence of a catalyst which promotes cyclization over polymerization, wherein Y is selected from the group consisting of alkoxy, acyloxy, amino and chloro, and R.sup.1 and R.sup.2 are selected from the group consisting of alkyl, unsaturated alkyl, alkoxy, aryl and hydrogen.
Immobilized silacrown ethers formed by the reaction of siliceous materials and silicrown ethers.
Dependencies are inferred from the claim text.