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    Fluorine contg. asymmetric trifunctional aromatic cpds. - useful in mfr. of fluorine contg. polyamideimide or polybenzimidazole-benzimidazolone(s)
    1.
    发明专利
    Fluorine contg. asymmetric trifunctional aromatic cpds. - useful in mfr. of fluorine contg. polyamideimide or polybenzimidazole-benzimidazolone(s) 未知

    公开(公告)号：DE4041255A1

    公开(公告)日：1992-06-25

    申请号：DE4041255

    申请日：1990-12-21

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR ,  APPEL WOLFGANG K DR ,  SIEGEMUND GUENTER DR

    IPC: C07C69/76 ,  C07D307/89

    Abstract: Asymmetric hexafluoroisopropylidene gp.-contg. aromatic cpds. of formula (I) are claimed as is also the prepn. of the tri-acid form of (I) by introduction of air into hexafluoro-2(4-methylphenyl) -2(3',4'-dimethylphenyl) propane in an acid org. medium at 120-220 deg.C/5-40 bar in presence of a mixt. of Co- and Mn- cpds. and bromide ions. (a) R1-3 = COOH, carboxylic acid halide and/or a carboxylic ester in which the OH component is a 1-4C alcohol or PhOH; or (b) R2 and R3 together form a carboxylic acid anhydride gp. and R1 is as for (a) or is a mixed anhydride gp. of formula -CO-O-OC.CH3. USE/ADVANTAGE - Use of (I) is claimed in the prodn. of F-contg. polyamide-imides or polybenzimidazole-benzimidazolones. Such polymers are obtd. by reaction of (I) with aromatic di- or tetra-amines and carbine high thermal- and hydrolytic-stability and good processing characteristics with good solubility.

    2.
    发明专利
    未知

    公开(公告)号：DE3826572A1

    公开(公告)日：1990-02-08

    申请号：DE3826572

    申请日：1988-08-04

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR

    IPC: C07D307/89 ,  C07C63/72 ,  C07D493/04 ,  C08G73/10

    Abstract: A process for the preparation of high-purity perfluorinated compounds, specifically of an aromatic tetracarboxylic acid and its anhydride, 5,5'-[2,2,2-trifluoro-1-(trifluoromethyl)-ethylidene]bis-1,3-isobenzof urandione, by a multi-step treatment of the crude compounds. The metal ion content of the compounds treated is reduced considerably. After polymerization with an aromatic diamine, the anhydride is used in microelectronics.

    Tris- and tetrakis-phthalyl-silanes, useful as crosslinking agents - by oxidn. of the corresp. tris- and tetrakis-(3,4- di:methylphenyl)-silane, followed by reaction with acetic anhydride
    5.
    发明专利
    Tris- and tetrakis-phthalyl-silanes, useful as crosslinking agents - by oxidn. of the corresp. tris- and tetrakis-(3,4- di:methylphenyl)-silane, followed by reaction with acetic anhydride 未知

    公开(公告)号：DE4229086A1

    公开(公告)日：1994-03-03

    申请号：DE4229086

    申请日：1992-09-01

    Applicant: HOECHST AG

    Inventor： WOLF ARNO DR ,  ROEHRSCHEID FREIMUND DR

    IPC: C07F7/08 ,  C08G59/42 ,  D06M13/513 ,  C08K5/15 ,  C08K5/54

    Abstract: Cpds. of formula (I) are new. In formula (I) R1 = Ar, Ar'-Phe-, 1- or 2-naphthyl, Ar'-R4-Phe-, alkyl (pref. 1-12C alkyl), or a gp. of formula (X) (with Ar = phenyl substd. with R2 and R2 with R2, R3 = H, tert.-Bu or OMe; Ar' = phenyl substd. with R2; Phe = 1,4-phenylene; R4 =O or (CH2)n with n = 1-3). Also claimed are processes for the prodn. of (I), (a) by oxidn. of the corresp. 3,4-xylyl cpd. of formula R1Si(xylyl)3 (II) (with xylyl = 1-(3,4-dimethylphenyl); R1 = as above except for X), or (b) (with R1 = X), by oxidn. of Si(xylyl), (III) and reaction with Ac2O. Also claimed are (i) cpds. of formula (I) with R1 = as above or also xylyl; and (ii) the prodn. of (II) and (III) by reaction of R1SiCl3 with R1 not = X or SCl4 respectively with a xylyl Grignard reagent or xylyl-Li. USE/ADVANTAGE - (I) are useful as crosslinking reagents for amino or OH gp.-contg. cpds., and cpds. (II) are useful as starting materials for prodn. of (I) (claimed). Applications include hardeners for paints, resins and plastics, esp. epoxy resins, hardeners for reaction adhesives, and textile finishing. The invention enables the prodn., in high yield, of cpds. (I) with at least 3 phthalic acid or anhydride gps..

    6.
    发明专利
    未知

    公开(公告)号：DE3685523D1

    公开(公告)日：1992-07-09

    申请号：DE3685523

    申请日：1986-07-10

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR

    IPC: C07C47/565 ,  C01G37/02 ,  C01G45/02 ,  C01G51/04 ,  C01G53/04 ,  C07C45/00 ,  C07C45/36 ,  C07C45/78 ,  C07C45/79 ,  C07C45/80 ,  C07C45/81 ,  C07C45/82 ,  C07C67/00

    Abstract: Process is for isolation of p-hydroxybenzaldehyde (I) from a reaction mixt. obtd. by oxidn. of p-cresol (II) with O2 or O2-contg. gas in MeOH in presence of NaOH or KOH and a manganese, nickel, chromium or cobalt salt. The process comprises: (i) treating the reaction mixt. with water; (ii) heating theobtd. soln.; (iii) filtering off the obtd. ppte. of hydrated Mn, Ni, Cr or Co oxide; (iv) distilling off MeOH from the filtrate; (v) cooling the remaining aq. soln.; and (vi) allowing (I) to crystallise as the Na or K salt. Alternatively the process comprises: (i') spray-drying the reaction mixt.; (ii') dissolving the soluble components of the residue in hot water; (iii') filtering off the undissolved hydrated Mn, Ni, Cr or Co oxide; and (iv') crystallising (I) as Na or K salt by cooling the filtrate. A further alternative process comprises: (i'') diluting the reaction mixt. with MeOH; (ii'') filtering off the undissolved hydrated Mn, Ni, Cr or Co oxide; (iii'') spray-drying the filtrate; (iv'') dissolving the residue in hot water; and (v'') crystallising (I) as Na or K salt by cooling the soln.

    Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid by co-oxidation
    9.
    发明专利
    Process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid by co-oxidation 未知

    公开(公告)号：DE3134133A1

    公开(公告)日：1983-03-17

    申请号：DE3134133

    申请日：1981-08-28

    Applicant: HOECHST AG

    Inventor： ROEHRSCHEID FREIMUND DR ,  RIEMENSCHNEIDER WILHELM DR

    IPC: C07C46/04 ,  C07C51/31 ,  C07C63/40

    Abstract: The invention relates to a process for the preparation of naphthalene-1,4,5,8-tetracarboxylic acid by oxidation of pyrene. The latter is treated with a low molecular weight carbonyl compound and oxygen in the presence of a catalyst and the resulting intermediate is reacted with chlorine in aqueous-alkaline solution. Most importantly, the process according to the invention makes it possible to avoid the procedural difficulties and serious environmental concerns which are associated with the disposal of substantial quantities of concentrated sulphuric acid which has hitherto been used as the solvent for the pyrene oxidation.

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