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    Phenyl N-methyl:carbamate prodn. - by heating corresp. alkyl ester with phenol in inert liq. in presence of Lewis acid, with continuous distn of alkanol
    1.
    发明专利
    Phenyl N-methyl:carbamate prodn. - by heating corresp. alkyl ester with phenol in inert liq. in presence of Lewis acid, with continuous distn of alkanol 未知

    公开(公告)号：DE4022605A1

    公开(公告)日：1991-01-31

    申请号：DE4022605

    申请日：1990-07-16

    Applicant: BASF AG

    Inventor： LUKSZA MICHAEL DR ,  HARTMANN HORST

    IPC: C07C271/44

    Abstract: Phenyl N-methylcarbamate of formula MeNH-COO-Ph (I) is produced by reaction of the corresp. (1-4C alkyl)-ester (II) with phenol in the liq. phase at elevated temp. in the presence of a Lewis acid catalyst, with continuous distillation of the alcohol ROH from the reaction mixt. Catalyst is pref. Ti(OEt)4, Ti(OPh)4, Ti(OPr)4, Al(OPr)3, Bu2Sn(OMe)2 or Bu2SnO. Reaction is carried out at 100-200 deg.C and 0.02-1 bar in the presence of an inert solvent, pref. 1,2-dichlorobenzene (DCB). Excess phenol is used, and mol. ratio (II):Lewis acid = (10:1)-(100:1). USE/ADVANTAGE - (I) is useful as a blocked methyl isocyanate (III), which releases the highly toxic (III) by thermal cleavage immediately before use. A simple and safe process for the prodn. of (I).

    2.
    发明专利
    未知

    公开(公告)号：DE3604873A1

    公开(公告)日：1987-08-20

    申请号：DE3604873

    申请日：1986-02-15

    Applicant: BASF AG

    Inventor： LUKSZA MICHAEL DR

    IPC: B01J25/00 ,  B01J27/00 ,  C07B61/00 ,  C07D213/30 ,  C07D213/56

    Abstract: Pyridinol carbamate is prepared by a process in which a carbamate of the formula H3C-NH-CO-O-R where R is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl or tert.-butyl, is reacted with 2,6-bis-(hydroxymethyl)-pyridine in the presence of a transesterification catalyst of the Lewis acid type in the liquid phase at elevated temperatures.

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