| 摘要 |
<p>Compounds having formula (I) wherein: X is selected from formula (III); m is 1 to 6; n is 1 to 100; R1 is selected from H, (C1-C20)alkyl, (C1-C20) alkoxy and (C1-C20)ester; and A is a saturated organic group selected from residues of alcohols, polyols, thiols, polythiols, amines, polyamines, acids and polyacids; are prepared by reacting compounds according to formula (II); wherein X, R1, n and A are as defined above, with hydrogen peroxide in the presence of (a) tungstic acid or its metal salts, (b) phosphoric acid or its metal salts, and (c) at least one phase transfer catalyst.</p> |
