Patents Assigned to Croda Synthetic Chemicals Limited
  • Process for the ortho-alkylation of phenols
    Patent number: 4471149
    Abstract: A phenol is ortho-alkylated by reaction with an alkanol in the presence of a catalyst comprising at least 92% w/w, calculated as Fe.sub.2 O.sub.3, of an oxide of iron, and at least one other metal oxide. By way of example, phenol can thus be converted to o-cresol and/or 2,6-xylenol.
    Type: Grant
    Filed: May 11, 1983
    Date of Patent: September 11, 1984
    Assignee: Croda Synthetic Chemicals Limited
    Inventors: Kenneth A. Adey, Frank S. Yates, John H. Young
  • Process for the ortho-alkylation of phenols
    Patent number: 4386226
    Abstract: A phenol is ortho-alkylated by reaction with an alkanol in the presence of a catalyst comprising at least 87% w/w, calculated as Fe.sub.2 O.sub.3, of an oxide of iron, and at least one other metal oxide, in which the other metal is selected from As, Cd, Co, Hg, In, Ni, Pb, lanthanide rare earths, Sc, Sn, Ti and Zr. By way of example, phenol can thus be converted to o-cresol and/or 2,6-xylenol.
    Type: Grant
    Filed: October 5, 1981
    Date of Patent: May 31, 1983
    Assignee: Croda Synthetic Chemicals Limited
    Inventors: Kenneth A. Adey, Frank S. Yates, John H. Young
  • Fused pyridines
    Patent number: 4375544
    Abstract: Aromatic-.alpha.-halo-{b} fused pyridines are made by reacting an aromatic acetamide, acid halide and amide in particular proportions, with the acid halide always in excess. The process permits the production of compounds having a wide range of substituents, that are new compounds, and that are of value as intermediates in the synthesis of, for instance, pharmaceutical compounds.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: March 1, 1983
    Assignee: Croda Synthetic Chemicals Limited
    Inventors: Otto Meth-Cohn, Brahma Narine
  • Process for preparing aralkyl halides
    Patent number: 4250340
    Abstract: A process for chlorinating m-phenoxytoluene by reaction with sulphuryl chloride in the presence of an initiator, in which the initiator is added not only at the beginning of, but also during, the reaction, and/or in which the initiator is a tert-butyl peralkanoate, and/or in which the reaction solvent is perchloroethylene and/or in which the m-phenoxytoluene and sulphuryl chloride are used in substantially equimolar amounts.
    Type: Grant
    Filed: December 20, 1978
    Date of Patent: February 10, 1981
    Assignee: Croda Synthetic Chemicals Limited
    Inventors: Philip J. McMahon, Frank S. Yates