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    • 1. 发明授权
    • Process for the preparation of oligophenyls dihalogenated in the
4,4'-position
    • 制备4,4'-位二卤代低聚苯基的方法
    • US5053566A
    • 1991-10-01
    • US571956
    • 1990-08-23
    • Artur BottaHans-Josef BuyschLothar Puppe
    • Artur BottaHans-Josef BuyschLothar Puppe
    • C07C41/22B01J29/50B01J29/60B01J29/70C07B61/00C07C17/12C07C25/18C07C41/38C07C43/225
    • C07C17/12
    • Oligophenyls dihalogenated in the 4,4'-position, of the formula ##STR1## can be prepared by catalyzed halogenation of oligophenyls of the formula ##STR2## wherein, in the formulae, X.sup.1 and X.sup.2 independently of one another represent chlorine or bromine, preferably chlorine,X.sup.3 denotes hydrogen, chlorine or bromine, preferably hydrogen or chlorine and particularly preferably hydrogen,R.sup.1, R.sup.2 and R.sup.3 independently of one another represent hydrogen, C.sub.1 -C.sub.4 -alkyl (preferably methyl or ethyl and particularly preferably methyl), C.sub.1 -C.sub.4 -alkoxy (preferably methoxy or ethoxy and particularly preferably methoxy), fluorine, chlorine or bromine anda assumes the value zero or one,with halogenating agents, the preparation being carried out in the presence of methylene chloride or solvent mixtures essentially containing methylene chloride and in the presence of zeolites of the L structure type which contain metal cations.
    • 在式(Ⅰ)的4,4'-位上二卤代的低级苯基可以通过式(II)的低聚苯基的催化卤化来制备,其中在式中X1和X2彼此独立地 代表氯或溴,优选氯,X3表示氢,氯或溴,优选氢或氯,特别优选氢,R 1,R 2和R 3彼此独立地表示氢,C 1 -C 4烷基(优选甲基或乙基,特别优选 甲基),C1-C4-烷氧基(优选甲氧基或乙氧基,特别优选甲氧基),氟,氯或溴,并且与卤化剂呈现零或一个值,该制剂在二氯甲烷或溶剂存在下进行 基本上含有二氯甲烷的混合物和在含有金属阳离子的L结构类型的沸石的存在下。
    • 8. 发明授权
    • Process for preparing monomethylated or dimethylated phenols
    • 制备单甲基化或二甲基化酚的方法
    • US5723694A
    • 1998-03-03
    • US755513
    • 1996-11-22
    • Artur BottaHans-Josef Buysch
    • Artur BottaHans-Josef Buysch
    • C07C37/50C07C37/00C07C37/20C07C39/07C07C69/007
    • C07C69/007C07C37/50
    • Phenols monomethylated or dimethylated in the ortho or para position to the OH group and having the formula ##STR1## can be prepared by reaction of tert-alkyl-substituted phenols of the formula ##STR2## in which at least one free ortho or para position to the OH group is present, in three reaction steps a), b) and c). In a), (II) is reacted with formaldehyde or its polymers and a carboxylic acid of the formula R.sup.3 --COOH, (III) which gives a mixture of substituted phenols of the formulae ##STR3## In b) the mixture of (IV)/(V) is hydrogenated using catalytically activated hydrogen to give the substituted phenols of the formula ##STR4## which, if m=0, are reacted in c) in the presence of an acid cleavage catalyst with elimination of tert-alkenes to give the methylated phenols of the formula (I). Before or during the hydrogenation, the phenols of the formulae (IV) and (V) can be reacted with the aid of an alcohol of the formula R.sup.4 --OH (VII) to give a mixture of the etherified substituted phenols of the formulae ##STR5## which can then, in the manner indicated, be hydrogenated and freed of the tert-alkyl groups.
    • 在OH基上邻位或对位甲基化或二甲基化的酚可以通过式(II)的叔烷基取代的酚与其中至少一个 在三个反应步骤a),b)和c)中存在OH基的游离的邻位或对位。 在a)中,(II)与甲醛或其聚合物和式R3-COOH(III)的羧酸反应,得到式IMA(IV)和(VI)的取代酚的混合物 )b)使用催化活化氢氢化(IV)/(V)的混合物,得到式(VI)的取代苯酚,如果m = 0,则在c) 具有消除叔烯烃的酸裂解催化剂,得到式(I)的甲基化酚。 在氢化之前或期间,式(Ⅳ)和(Ⅴ)的酚可以借助于式R 4 -OH(Ⅶ)的醇进行反应,得到下列化学式的醚化取代酚的混合物 (VIII)化合物,氢化并除去叔烷基。