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    • 45. 发明授权
    • Process for the preparation of 5-substituted resorcinols and related
intermediates
    • 5-取代的间苯二酚和相关中间体的制备方法
    • US4020098A
    • 1977-04-26
    • US594412
    • 1975-07-09
    • Jacques Gosteli
    • Jacques Gosteli
    • C07C37/50C07C39/08C07C69/76
    • C07C37/50C07C67/343C07C69/88C07C69/94
    • According to the present invention, 5-substituted resorcinols of the formula I ##STR1## wherein R.sub.1 represents a hydrocarbon radical, optionally unsubstituted or substituted by inert substituents, are prepared by reacting a carboxylic acid ester of the formula IIr.sub.1 -- c .tbd. c -- co -- o -- r.sub.2 (ii)wherein R.sub.2 represents a non-aromatically bound lower hydrocarbon radical, in the presence of an alkaline condensation agent, with a diester of 3-oxoglutaric acid of the formula IIIr.sub.3 --o--co--ch.sub.2 --co--ch.sub.2 --co--o--r.sub.4 (iii)wherein R.sub.3 and R.sub.4 represent non-aromatically bound lower hydrocarbon radicals; hydrolyzing the resulting dihydroxyisophthalic acid acid ester of the formula IV ##STR2## and decarboxylating the hydrolyzed product, a specific embodiment is the preparation of 5-pentylresorcinol.
    • 根据本发明,式I的5-取代间苯二酚(I)其中R 1表示任选未取代或被惰性取代基取代的烃基,其通过使式II的羧酸酯R 1 -C 其中R 2表示非芳香结合的低级烃基,在碱性缩合剂的存在下,与式III的3-氧代戊二酸的二酯R 3 -O-CO- CH2-CO-CH2-CO-O-R4(Ⅲ)其中R3和R4代表非芳香结合的低级烃基; 水解所得的式IV(IV)的二羟基间苯二酸酸酯并使水解产物脱羧,具体实施方案是5-戊基间苯二酚的制备。