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    • 9. 发明授权
    • Preparation of 2-hydroxyalkylchromans
    • 2-羟基烷基苯并二氢吡喃的制备
    • US4344886A
    • 1982-08-17
    • US238608
    • 1981-02-26
    • Michael HornerAxel Nissen
    • Michael HornerAxel Nissen
    • C07D311/72B01J27/08C07B61/00C07D311/58
    • C07D311/58
    • 2-Hydroxyalkylchromans (I) ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each H or C.sub.1 -C.sub.8 -alkyl, R' is H or an organic radical which can be split off hydrolytically or hydrogenolytically as R'-OH or R'-COOH, and m is 1, 2 or 3, are prepared by reacting a hydroquinone II ##STR2## (a) with an alkenediol IIIa ##STR3## or (b) with an alkenediol IIIb ##STR4## or (c) with an alkenediol IIIc ##STR5## where R.sup.4' is a radical which during the condensation with II is converted to the radical R.sup.4,at from -50.degree. C. to 120.degree. C., in an inert solvent, in the presence of from 10 to 300 mole %, based on II, of a Lewis acid or of an adduct of a Lewis acid with a Lewis base which has a lower basicity than compound II.
    • 2-羟基烷基苯并二氢吡喃(I)其中R 1,R 2,R 3和R 4各自为H或C 1 -C 8 - 烷基,R'为H或可以作为R'-OH水解或氢解分解的有机基团 R'-COOH,m为1,2或3,通过使氢醌II(a)与烯二醇IIIa IIIa或(b)与烯二醇IIIb IIIb或( c)具有烯二醇IIIc IIIc,其中R 4'是在与C的缩合过程中,在-50℃至120℃下,在惰性溶剂中,在存在 10至300摩尔%,基于II,路易斯酸或路易斯酸与路易斯碱的加合物具有比化合物II低的碱性。