Patents by Inventor Gilbert Billeb

Gilbert Billeb has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5446190
    Abstract: Process for the preparation of alcohol fluorobenzoates of the formula (I) ##STR1## in which R is an alkyl radical and F.sub.n is 1 to 4 fluorine atoms which, independently of one another, are bonded to the aromatic ring, by reacting a fluorobenzyl chloride of the formula (II) ##STR2## in which F.sub.n is as defined above, with an at least stoichiometric amount of an alkali metal alcoholate ROM in which R is as defined above and M is an alkali metal from the group consisting of Li, Na and K, in the corresponding alcohol ROH at temperatures from -10.degree. C. to 150.degree. C., the solvent is distilled off, if appropriate, and the alkali metal chloride formed is separated off by treating the mixture with water or by filtration.
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: August 29, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gilbert Billeb, Wolfgang Tronich
  • Patent number: 5382694
    Abstract: A process for the continuous production of aromatic aldehydes of the formula (1) ##STR1## in which Ar is an aryl radical, R.sup.1, R.sup.2 and R.sup.3 independently of one another are hydrogen, fluorine, chlorine or bromine atoms, in which dichloromethyl-substituted aromatics of the formula (2) ##STR2## in which Ar, R.sup.1, R.sup.2, R.sup.3 have the above meanings, are continuously hydrolyzed with an aqueous solution of one or more catalysts of the formula (3)MX.sub.n (3)in which M is a transition metal selected from the group comprising iron, nickel, copper, chromium, thallium, zinc and mercury, X is F, Cl, Br, I, OH, SO.sub.4, PO.sub.4 or NO.sub.3, and n depending on the oxidation state of the transition metal M is the number 1, 2, 3 or 4, in a concentration of from about 1 to about 50%, based on the weight of water in the catalyst solution, at temperatures of from about 70.degree. to about 160.degree. C.
    Type: Grant
    Filed: November 23, 1993
    Date of Patent: January 17, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gilbert Billeb, Georg Folz
  • Patent number: 5349104
    Abstract: Without added stabilizers, aminobenzotrifluorides have low thermal and storage stability.The present invention relates to preparations of a stabilized amionbenzotrifluoride, composed essentially ofa) an aminobenzotrifluoride of the formula (I), ##STR1## in which R.sup.1 and R.sup.2, independently of each other, are hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -alkenyl, substituted or unsubstituted aryl, halogen, CF.sub.3, nitro, amino, methoxy, hydroxyl or NR.sup.3 R.sup.4, where R.sup.3 and R.sup.4, independently of each other, are hydrogen or C.sub.1 -C.sub.5 -alkyl radicals, and the NH.sub.2 group can be located in the 2-, 3- or 4-position in relation to the CF.sub.3 group, andb) at least one base.
    Type: Grant
    Filed: May 4, 1993
    Date of Patent: September 20, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gilbert Billeb, Gunther Semler
  • Patent number: 5347054
    Abstract: A process for preparing aromatic aldehydes of the formula (1) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 independently of one another are H, F, Cl or Br, by hydrolyzing a dichloromethyl-substituted benzene of the formula (2) ##STR2## in which R.sup.1, R.sup.2, R.sup.3 have the abovementioned meanings with a from about 1 to about 50% strength aqueous solution of one or more zinc salts of the formula (3)ZnX.sub.n (3)in which X is F, Cl, Br, I, OH or SO.sub.4, and n is, depending on the anion X, the number 1 or 2, at temperatures of from about 70.degree. to about 160.degree. C.
    Type: Grant
    Filed: November 23, 1993
    Date of Patent: September 13, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gilbert Billeb, Peter Burg