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    1.
    发明专利
    未知

    公开(公告)号：DE4313174A1

    公开(公告)日：1994-10-27

    申请号：DE4313174

    申请日：1993-04-22

    Applicant: HOECHST AG

    Inventor： SEMLER GUENTHER DR ,  MEIER MICHAEL DR

    IPC: C07C227/18 ,  C07C227/22 ,  C07C229/56 ,  C07D265/26

    Abstract: Process for the preparation of alkyl 3-chloroanthranilates, by reacting 3-chloroanthranilic acid with 0.8 to 5 parts by weight of phosgene in an inert solvent and reacting the resulting 3-chloroisatoic anhydride with an alkanol, if appropriate in the presence of an esterification catalyst, to give the alkyl 3-chloroanthranilate.

    3.
    发明专利
    未知

    公开(公告)号：DE59400622D1

    公开(公告)日：1996-10-17

    申请号：DE59400622

    申请日：1994-04-19

    Applicant: HOECHST AG

    Inventor： SEMLER GUENTHER DR ,  MEIER MICHAEL DR

    IPC: C07C227/18 ,  C07C227/22 ,  C07C229/56 ,  C07D265/26

    Abstract: Process for the preparation of alkyl 3-chloroanthranilates, by reacting 3-chloroanthranilic acid with 0.8 to 5 parts by weight of phosgene in an inert solvent and reacting the resulting 3-chloroisatoic anhydride with an alkanol, if appropriate in the presence of an esterification catalyst, to give the alkyl 3-chloroanthranilate.

    5.
    发明专利
    未知

    公开(公告)号：DE3685250D1

    公开(公告)日：1992-06-17

    申请号：DE3685250

    申请日：1986-04-05

    Applicant: HOECHST AG

    Inventor： SEMLER GUENTHER DR ,  SCHAEFFER GEORGE DR

    IPC: C07C271/04 ,  C07C67/00 ,  C07C239/00 ,  C07C271/02

    Abstract: Carbamic acid chlorides of sec. amines are produced by passing phosgene in a sec amine of formula R1R3CHNHCHR2R4 (I) or its soln. at 80-160 (100-130) deg.C (R1 and R2 are each 1-20 (1-7)C alkyl and R3 and R4 are each 1-4 (1-2)C alkyl or R1 and R2 and/or R3 and R4 together form -(CH2)4- or -(CH2)5-). The pref. (I) is N,N-di-sec. butylamine and the process is pref. carried out in the absence of a solvent.

    Preventing metal corrosion during prodn. of acyl-chloride(s) - using metals with electro-negativity of above 1.2
    6.
    发明专利
    Preventing metal corrosion during prodn. of acyl-chloride(s) - using metals with electro-negativity of above 1.2 未知

    公开(公告)号：DE4006370A1

    公开(公告)日：1991-09-05

    申请号：DE4006370

    申请日：1990-03-01

    Applicant: HOECHST AG

    Inventor： SEMLER GUENTHER DR

    IPC: C07C51/64 ,  C23F11/18

    Abstract: Inhibition of corrosion of metallic workpieces in the prodn. of aliphatic, aromatic or araliphatic carboxylic acid chlorides from phosgene and corresp. carboxylic acids (anhydrides) is new. The reactions take place in the presence of dialkylated carboxylic acid amides and/or tri-substd. phosphanoxides and/or sulphides as phosgenating catalysts. - At the end of phosgenation, metal (cpds) having an electronegativity of at least 1.2 are added to the reaction mixt. in at least equi-molar amts w.r.t. the catalyst at 80-180deg.C, as corrosion inhibitors (claimed). (6pp Dwg.no.0/0)

    7.
    发明专利
    未知

    公开(公告)号：DE58907177D1

    公开(公告)日：1994-04-14

    申请号：DE58907177

    申请日：1989-11-21

    Applicant: HOECHST AG

    Inventor： MEIER MICHAEL DR ,  SEMLER GUENTHER DR

    IPC: C07D235/26

    Abstract: Process for the preparation of benzimidazolones of the formula (1) (1) in which R1 and R2 are identical or different and denote hydrogen or halogen atoms, or alkyl(C1-C4), alkoxy(c1-C4), trifluoromethyl, phenyl, phenoxy or nitro groups, by reacting o-phenylenediamines of the formula (2) (2) in which R1 and R2 have the meaning given, with phosgene in water in the presence of an alkali metal base or alkaline earth metal base or a salt of an alkali metal hydroxide or alkaline earth metal hydroxide and a weakly inorganic or organic acid or a mixture of such salts or a suitable buffer system, at a pH of about 6 to about 12, and at a temperature of about 20 DEG to 100 DEG C.

    Preventing corrosion of metal materials in prodn. of acid chloride(s)
    8.
    发明专利
    Preventing corrosion of metal materials in prodn. of acid chloride(s) 未知

    公开(公告)号：DE4036358A1

    公开(公告)日：1992-05-21

    申请号：DE4036358

    申请日：1990-11-15

    Applicant: HOECHST AG

    Inventor： SEMLER GUENTHER DR

    IPC: C07C51/64 ,  C23F11/18

    Abstract: The prevention of corrosion on metal materials in the prodn. of aliphatic, araliphatic or armoatic carboxylic acid chlorides from phosgene and the corresp. acids or anhydrides in the presence of dialkylated acid amides and/or quat. ammonium salts as phosgenation catalysts (I); the process comprises addn. to the reaction mixt., when phosgenation is complete, of cpds. of metals with electronegativity 1.2 or above or the metals themselves (II) in at least eqimol. amts. w.r.t (I) as corrosion inhibitors, and allowing them to act at about . 80-180 deg. C.

    10.
    发明专利
    未知

    公开(公告)号：DE59303468D1

    公开(公告)日：1996-09-26

    申请号：DE59303468

    申请日：1993-05-04

    Applicant: HOECHST AG

    Inventor： BILLEB GILBERT DR ,  SEMLER GUENTHER DR

    IPC: C07C209/90 ,  C07C211/05 ,  C07C211/07 ,  C07C211/27 ,  C07C211/35 ,  C07C211/45 ,  C07C211/52

    Abstract: Without added stabilisers, aminobenzotrifluorides have a low heat and storage stability. The present invention relates to preparations of a stabilised aminobenzotrifluoride, consisting essentially of a) an aminobenzotrifluoride of the formula (I) in which R and R independently of one another denote hydrogen, C1-C6-alkyl, C2-C6-alkenyl, substituted or unsubstituted aryl, halogen, CF3, nitro, amino, methoxy, hydroxyl or NR R , where R and R independently of one another represent hydrogen or C1-C5-alkyl radicals, and the NH2 group can be in the 2-, 3- or 4-position relative to the CF3 group and b) at least one base. en

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