| 摘要 |
Disclosed is a process for preparing a compound of the formula wherein R<SUB>1 </SUB>is an alkyl group having at least one ethylenic unsaturation, an arylalkyl group having at least one ethylenic unsaturation, or an alkylaryl group having at least one ethylenic unsaturation, R<SUB>2 </SUB>and R<SUB>3 </SUB>each, independently of the others, are alkylene groups, arylene groups, arylalkylene groups, or alkylarylene groups, and n is an integer representing the number of repeat amide units and is at least 1, said process comprising: (a) reacting a diacid of the formula <?in-line-formulae description="In-line Formulae" end="lead"?>HOOC-R<SUB>2</SUB>-COOH <?in-line-formulae description="In-line Formulae" end="tail"?> with a diamine of the formula in the absence of a solvent while removing water from the reaction mixture to form an acid-terminated oligoamide intermediate; and (b) reacting the acid-terminated oligoamide intermediate with a monoalcohol of the formula <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUB>1</SUB>-OH <?in-line-formulae description="In-line Formulae" end="tail"?> in the presence of a coupling agent and a catalyst to form the product.
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