| 摘要 |
Compounds of formula (I) wherein R<SUB>1 </SUB>and R<SUB>2 </SUB>are each independently C<SUB>1</SUB>-C<SUB>2 </SUB>alkyl, and m is 1, 2, 3, 4, or 5 and compositions of formula (II) wherein R<SUB>1 </SUB>and R<SUB>2 </SUB>are each independently C<SUB>1</SUB>-C<SUB>4 </SUB>alkyl, and n is an integer >_0 and wherein the average molar value of n for the total of the compounds of formula (II) in said composition is in the range of (1) to (3) and methods for production thereof.
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