Diels-alder Reaction Patents (Class 570/215)
  • Methods of preparing -xylene from biomass
    Patent number: 8969057
    Abstract: Methods or preparing para-xylene from biomass by carrying out a Diels-Alder cycloaddition at controlled temperatures and activity ratios. Methods of preparing bio-terephthalic acid and bio-poly(ethylene terephthalate (bio-PET) are also disclosed, as well as products formed from bio-PET.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: March 3, 2015
    Assignee: The Coca-Cola Company
    Inventors: Indra Prakash, Venkata Sai Prakash Chaturvedula, Robert M. Kriegel, Xiaoyan Huang Huang
  • Synthesis of (dibromocyclobuta) aromatic compounds
    Patent number: 7138554
    Abstract: A method for the synthesis of cyclobuta aromatic compounds by cyclizing two ortho dibromoalkyl substituents is described. Using a mediator, such as nickel metal, and continuous removal of product from contact with the mediator, high product yields are achieved. A method for bromination of ortho alkyl substituents of aromatic compounds is also described.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: November 21, 2006
    Assignee: Technion Research and Development Foundation
    Inventor: Amnon Stanger
  • Norbornene polymerization initiators and process for preparing same
    Patent number: 5281368
    Abstract: The present invention relates to a novel compound, its use as an initiator in anionic polymerizations yielding norbornene-terminated homopolymers of block copolymers, and the further use of said norbornene-terminated polymers as macromonomers in the preparation of graft copolymers.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: January 25, 1994
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Anthony J. Dias, Sudhin Datta, Joseph A. Olkusz, Fred T. Morrar
  • Diels-Alder cyclization over copper-containing ZSM-12
    Patent number: 4665247
    Abstract: The present invention provides a process which is adapted for cyclodimerization of 1,3-butadiene to 4-vinylcyclohexene-1 under Diels-Alder conditions in the presence of a copper-containing ZSM-12.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: May 12, 1987
    Assignee: Mobil Oil Corporation
    Inventor: Ralph M. Dessau
  • Substituted pyridines and their preparation
    Patent number: 4405792
    Abstract: 4-(Chlorophenyl)pyridines in which the chlorine atom is in the 3- or 4-position of the phenyl group are prepared by reacting a 4-vinyl pyridine with chloroprene to form a 4-(3- or 4-chlorocyclohex-3-enyl)pyridine and then catalytically dehydrogenating the 4-(3- or 4-chlorocyclohex-3-enyl)pyridine to form a 4-(3- or 4-chlorophenyl)pyridine. The 4-(3- and 4-monochlorocyclohex-3-enyl)pyridines are novel compounds.
    Type: Grant
    Filed: September 8, 1981
    Date of Patent: September 20, 1983
    Assignee: Ethyl Corporation
    Inventor: Thomas J. Walter
  • Synthesis 2-alkyl cyclopentenolones
    Patent number: 4359586
    Abstract: 2-Hydroxy-3-methylcyclopent-2-en-1-one was synthesized in a five-step synthesis starting from 2-methyl-1,3-butadiene. Novel intermediate steps include the hot tube isomerization of 1,1-dihalo-2-methyl-2-vinylcyclopropane to give 1-methyl-4,4-dihalocyclopent-1-ene, hydrolysis to 3-methyl-2-cyclopenten-1-one, epoxidation of the latter using a phase transfer catalyst, followed by catalyzed isomerization to produce 2-hydroxy-3-methylcyclopent-2-en-1-one in high overall yield.
    Type: Grant
    Filed: February 12, 1981
    Date of Patent: November 16, 1982
    Assignee: SCM Corporation
    Inventors: Tse-Lok Ho, Shing-Hou Liu