prov:value
| - Suitable organometallic catalysts, exemplified here by tin as the metal, are represented by the formula: Rn Sn[X--R1 --Y]2, wherein R is a C1 -C8 alkyl or aryl group, R1 is a C0 -C18 methylene group optionally substituted or branched with a C1 -C4 alkyl group, Y is hydrogen or an hydroxyl group, preferably hydrogen, X is methylene, an --S--, an --SR2 COO--, --SOOC--, an --03 S--, or an --OOC-- gro
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