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Etherification of bark extracts and condensed tannins
Etherification of bark extracts and condensed tannins
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机译:树皮提取物和单宁浓缩物的醚化
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摘要
Polyphenolic extracts of coniferous tree barks and condensed tannins from wood such as quebracho extracts are etherified by reaction at elevated temperature in the presence of an alkaline catalyst with an olefin containing a double bond-activated carbonyl group having the structure ##EQU1## A particularly effective olefin is acrolein. The reaction products are produced in high yield, are water or alkali soluble and act among other uses as good dispersants.
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