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    45.
    发明专利
    未知

    公开(公告)号：DE4014203A1

    公开(公告)日：1991-11-07

    申请号：DE4014203

    申请日：1990-05-03

    Applicant: BASF AG

    Inventor： ERNST HANSGEORG DR ,  PAUST JOACHIM DR ,  HOFFMANN WERNER DR

    IPC: C07C45/75 ,  C07C49/653 ,  C07C49/743 ,  C07C69/63 ,  C07C403/12 ,  C07C403/24 ,  C07F9/54

    Abstract: Process for the preparation of canthaxanthine (Ia) and astaxanthine (Ib) of the general formula I … … in which R represents H (a) or OH (b), which process is characterised in that a tertiary alcohol of the general formula II … … in which R represents H (a) or OH (b), is reacted with trifluoroacetic acid, the novel trifluoroacetate obtained of the general formula III … … is reacted with triphenylphosphine, the novel triphenylphosphonium trifluoroacetate obtained of the general formula IV … … is reacted with 2,7-dimethyl-2,4,6-octatriene-1,8-dial under the conditions of a Wittig synthesis. In addition, the invention relates to the novel trifluoroacetates of the formula III and the corresponding triphenylphosphonium trifluoroacetates of the formula IV.

    PROCESS FOR THE PREPARATION OF 2,3,5-TRIMETHYL-P-BENZOQUINONE
    49.
    发明专利
    PROCESS FOR THE PREPARATION OF 2,3,5-TRIMETHYL-P-BENZOQUINONE 未知

    公开(公告)号：DE3361151D1

    公开(公告)日：1985-12-12

    申请号：DE3361151

    申请日：1983-04-11

    Applicant: BASF AG

    Inventor： THOEMEL FRANK DR ,  HOFFMANN WERNER DR

    IPC: C07C46/00 ,  B01J23/00 ,  B01J23/72 ,  B01J27/122 ,  B01J31/02 ,  C07B61/00 ,  C07C37/07 ,  C07C39/07 ,  C07C45/00 ,  C07C46/02 ,  C07C46/04 ,  C07C46/06 ,  C07C46/08 ,  C07C46/10 ,  C07C50/02 ,  C07C50/04 ,  C07C67/00

    Abstract: Trimethyl-p-benzoquinone of the formula I (I) is prepared by a process wherein A. 2,5,6-trimethylcyclohex-2-en-1-one or 2,3,6-trimethylcyclohex-2-en-1-one is reacted with air or oxygen at from 0 DEG to 150 DEG C. in a virtually anhydrous low molecular weight alkanol in the presence of a catalytic amount of copper(I) oxide or copper(II) oxide and in the presence of from 1 to 10 moles of a hydrogen halide gas per mole of trimethylcyclohexenone, and thereafter B. the reaction mixture, which essentially contains 2,3,6-trimethylphenol and/or 4-halo-2,3,6-trimethylphenol, is mixed with an alkali metal alcoholate in an amount such that a sample, when moistened with water, has a pH of from 3 to 6, and is then reacted with air, pure oxygen or tert.-butyl hydroperoxide at from 0 DEG to 150 DEG C., or wherein from 1 to 10 mole equivalents of a hydrogen halide gas per mole of substrate to be reacted are passed into a mixture containing a virtually anhydrous low molecular weight alkanol and a catalytic amount of copper(I) oxide or copper(II) oxide at from 0 DEG to 30 DEG C., an alkali metal alcoholate is added in an amount such that a sample, when moistened with water, has a pH of from 3 to 6, about one mole equivalent of 2,3,6-trimethylphenol is added and the mixture is then reacted with air, oxygen or tert.-butyl peroxide at from 0 DEG to 150 DEG C. Trimethyl-p-benzoquinone is an important intermediate for the synthesis of vitamin E.

    PROCESS FOR THE PREPARATION OF PINK OXIDE CONTAINING THE PREPONDERANT Z-ISOMER
    50.
    发明专利
    PROCESS FOR THE PREPARATION OF PINK OXIDE CONTAINING THE PREPONDERANT Z-ISOMER 未知

    公开(公告)号：DE3264588D1

    公开(公告)日：1985-08-08

    申请号：DE3264588

    申请日：1982-12-06

    Applicant: BASF AG

    Inventor： HOFFMANN WERNER DR

    IPC: C07D309/04

    Abstract: A mixture of Z- and E-2-[2-methylprop-1-en-1-yl]-4-methyltetrahydropyran isomers, of the formulae Z-I and E-I containing not less than 85% of Z-I and not more than 15% of E-I, is prepared by a process wherein 2-[2-methylprop-1-en-1-yl]-4-methylenetetrahydropyran of the formula II II is hydrogenated over a platinum dioxide or platinum/charcoal catalyst in the presence of a strongly acidic cation exchanger. The product is a useful fragrance material which also occurs naturally and is known as rose oxide.

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