Catalytic production of polyhalo-keto-alkenoic acids
    1.
    发明授权
    Catalytic production of polyhalo-keto-alkenoic acids 失效
    多羟基 - 酮酸的催化生产

    公开(公告)号:US3842126A

    公开(公告)日:1974-10-15

    申请号:US29238472

    申请日:1972-09-26

    申请人: AIR PROD & CHEM

    发明人: ERBY W TOMPKINS J

    CPC分类号: C07D307/58 C07C59/88

    摘要: 1. A METHOD FOR PRODUCING C5 TO C10 POLYCHLORINATED OR POLYBROMINATED 4-KETO-ALKENOIC ACIDS, WHICH COMPRISES THE STEPS OF DIRECT COMBINED CATALYTIC HALOGENATION AND DEHYDROGENATION OF C5 TO C10 4-KETO MONOCARBOXY ALKANOIC ACIDS WITH ELEMENTAL CHLORINE OR BROMINE IN THE PRESENCE OF A CATALYST AMOUNT OF AT LEAST ONE CATION SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, ZINC, TITANIUM, COBALT, MAGNESIUM AND CALCIUM, WHEREIN THE REACTION IS INITATED AT SUBSTANTIALLY AMBIENT TEMPERATURE AND SURING SAID TIME PERIOD THE TEMPERATURE IS GRADUALLY RAISED TO A FINAL TEMPERATURE OF FROM 170*C. TO 210*C, THE REACTION BEING CONTROLLED BY THE RATE OF CHLORINE OR BROMINE SUFFICIENT TO PREVENT THE TEMPERATURE EXCEEDING 210*C.