By Dimerization Of Vinyl Aromatic Patents (Class 585/406)
  • Patent number: 8766027
    Abstract: The present invention relates to additive composition for control and inhibition of polymerization of styrene, wherein the composition comprises amine and quinone methide, and wherein the amine is polymerization non-inhibitor amine. In one embodiment, the present invention relates to method of preparation and use of additive composition to control and inhibit polymerization of styrene, wherein the composition comprises amine and quinone methide, and wherein the amine is polymerization non-inhibitor amine. In another embodiment, the present invention relates to additive composition for control and inhibition of polymerization of styrene, wherein the composition comprises oxide treated derivative of amine and quinone methide, and wherein the amine is polymerization non-inhibitor amine, and to the method of preparation and use thereof.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: July 1, 2014
    Assignee: Dorf Ketal Chemicals (India) Private Limited
    Inventor: Mahesh Subramaniyam
  • Publication number: 20130324745
    Abstract: A process is provided which allows the synthesis of a large number of styrene derivatives with formation of C—C bonds, with use being possible of economically advantageous substrates, readily available carbon nucleophiles, and both inexpensive and environmentally unproblematic catalyst systems, permitting reaction under mild conditions and a high compatibility with functional groups on the reactants involved.
    Type: Application
    Filed: May 31, 2013
    Publication date: December 5, 2013
    Inventors: Matthias GOTTA, Bernd Wilhelm LEHNEMANN, Axel VON WANGELIN JACOBI, Samet GUELAK
  • Publication number: 20090069580
    Abstract: A reductive cross coupling reaction process for functionalization of a nucleophilic alkene can be achieved. The nucleophilic alkene and a nucleophilic cross coupling partner compound can be reacted in the presence of an oxidizable alcohol and a suitable catalyst to form a reductive coupling product. Various additives can also be useful to refine the process such as by mitigating certain undesirable intermediates, facilitating specific site selectivity for various substitutions or reaction sites, etc. Chiral additives can be optionally used which act to provide asymmetric catalysis, e.g. allow for regioselective and stereoselective production of reductive coupling products. A reductive cross coupling pathway can include oxidizing the oxidizable alcohol to form a catalyst hydride. The nucleophilic alkene can be inserted into the catalyst hydride to form a catalyst-alkyl intermediate.
    Type: Application
    Filed: June 25, 2008
    Publication date: March 12, 2009
    Inventors: Matthew S. Sigman, Keith M. Gligorich
  • Patent number: 6784331
    Abstract: Porous microcomposites have been prepared from perfluorinated ion-exchange polymer and metal oxides such as silica using the sol-gel process. Such microcomposites possess high surface area and exhibit extremely high catalytic activity.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: August 31, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mark Andrew Harmer, Qun Sun
  • Patent number: 6586599
    Abstract: A process for conducting coupling reactions of aryl halides with unsaturated silanes is described. The processes use N-heterocyclic carbenes as ancillary ligands in these coupling reactions. A coupling of an aryl halide with an unsaturated silane can be carried out by mixing, in a liquid medium, at least one strong base; at least one aryl halide or aryl pseudohalide in which all substituents are other than silyl groups, wherein the aryl halide has, directly bonded to the aromatic ring(s), at least one chlorine atom, bromine atom, or iodine atom; at least one silane wherein the silicon atom is quaternary, wherein one group bound to the silicon atom is unsaturated at the alpha or beta position, and wherein each of the remaining groups bound to the silicon atom is a saturated hydrocarbyl or a saturated hydrocarbyloxy group; at least one nickel, palladium, or platinum compound, wherein the formal oxidation state of the metal is zero or two; and at least one N-heterocyclic carbene.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: July 1, 2003
    Assignee: University of New Orleans Research and Technology Foundation
    Inventors: Steven P. Nolan, Hon Man Lee
  • Patent number: 6388153
    Abstract: The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated to a temperature in the range of 65° C. to 140° C. to form alpha methyl styrene dimers. The present invention also relates to the products produced by this inventive method.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: May 14, 2002
    Assignee: E. I. duPont Nemours and Company
    Inventor: Alexei Alexeyevich Gridnev
  • Patent number: 6294708
    Abstract: The present invention relates to a method of making alpha-methylstyrene dimers by combining a cobalt catalyst, a free-radical initiator and an alpha-methylstyrene monomer, in an inert atmosphere, to form a mixture. The mixture is heated to a temperature in the range of 5° C. to 140° C. to form alpha methyl styrene dimers. The present invention also relates to the products produced by this inventive method.
    Type: Grant
    Filed: February 5, 1999
    Date of Patent: September 25, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Alexei Alexeyevich Gridnev
  • Patent number: 5969204
    Abstract: A process for the production of compounds useful as fluorescent whitening agents of formula: ##STR1## in which X and Y, are as defined herein and n is 1 or 2, comprises A) diazotising one mole of an amine of formula: ##STR2## (2A) to produce a diazonium compound of the formula: ##STR3## (2) in which G.sub.1 is a counter ion; and diazotising one mole of an amine of formula: ##STR4## (3A) to produce a diazonium compound having the formula: ##STR5## (3); and B) reacting one mole of a divinyl compound having the formula: ##STR6## (4) with one mole of a compound having the formula (2) and with one mole of a compound having the formula (3), in the presence of an inorganic or organic palladium salt, or a mixture thereof, as catalyst-precursor.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: October 19, 1999
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Victor Eliu, Werner Kanert, Peter Baumeister, Julia Volkel
  • Patent number: 5700647
    Abstract: To provide a reagent with excellent stability under storage, which can detect a subject compound to be measured with higher specificity and sensitibity.
    Type: Grant
    Filed: December 7, 1995
    Date of Patent: December 23, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takeshi Miyazaki, Kazumi Tanaka, Tsuyoshi Santo, Toshikazu Ohnishi, Tetsuro Fukui, Tadashi Okamoto
  • Patent number: 5502264
    Abstract: 1-pentene dimers of .alpha.-methylstyrenes are produced with high selectivity in good productivity by stirring 50 to 95 parts by weight of an .alpha.-methylstyrene in the presence of 50 to 5 parts by weight of an aqueous solution of a sulfonic acid, and a 1-pentene dimer having good preservative property is then collected by removing the sulfonic acid, adjusting the resulting reaction solution to pH 8 or higher and distilling the neutralized reaction solution.
    Type: Grant
    Filed: May 18, 1994
    Date of Patent: March 26, 1996
    Assignee: Goi Chemical Company, Ltd.
    Inventors: Hiroshi Nishizawa, Takayuki Saitoh, Tatsuo Itoh, Kiyotaka Mashita
  • Patent number: 5481053
    Abstract: A process for preparing unsaturated dimers of .alpha.-methylstyrene comprising dimerizing .alpha.-methylstyrene using activated clay or acid clay as a catalyst, in which the dimerization is carried out in the presence of a carbonic acid ester, preferably ethylene carbonate, which process achieves high selectivity to unsaturated dimers with ease in controlling the reaction temperature.
    Type: Grant
    Filed: September 22, 1994
    Date of Patent: January 2, 1996
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masashi Inaba, Shiroh Inui, Hideki Kurokawa, Fujio Mizutani
  • Patent number: 4264749
    Abstract: Organo-lithium compounds of the formula: ##STR1## wherein R is an alkyl group of up to 5 carbon atoms, R' is either hydrogen or an alkyl group of up to 5 carbon atoms and n is an integer from 2 to 10. These bifunctional organo-lithium compounds are prepared without the use of any polar or complexing agent and are useful as polymerization initiators for the production of block copolymers.
    Type: Grant
    Filed: July 31, 1979
    Date of Patent: April 28, 1981
    Assignee: Societe Chimique des Charbonnages
    Inventors: Pierre Sigwalt, Patrick Guyot, Michel Fontanille, Jean-Pierre Vairon
  • Patent number: 4254292
    Abstract: A method for preparing polycyclic aromatic hydrocarbons with excellent yield and selectivity but without the formation of cyclic dimers and other undesirable by-products. In the method of the present invention, styrene, .alpha.-methylstyrene, .beta.-methylstyrene and/or vinyltoluene is dimerized and/or codimerized to produce unsaturated dimer and/or codimer in the first step reaction and said unsaturated dimer and/or codimer is caused to react with an aromatic hydrocarbon or hydrocarbons in the second step reaction, and both the first and second step reactions are carried out in the presence of a catalyst which is represented by the general formula: RCF.sub.2 SO.sub.3 H, in which the symbol R is Cl, F or C.sub.n F.sub.p CL.sub.2n+1-p, wherein n is an integer from 1 to 3 and p is also an integer from 1 to 2n+1.
    Type: Grant
    Filed: October 18, 1979
    Date of Patent: March 3, 1981
    Assignee: Nippon Petrochemicals Co., Ltd.
    Inventors: Isoo Shimizu, Okitsugu Tsuji, Eiichi Matsuzaka, Atsushi Sato
  • Patent number: 4199481
    Abstract: A process is described for providing clear extended compositions of essential oils which comprises a composition of an essential oil and an extender material miscible with said essential oil which does not appreciably alter the aroma of the essential oil insofar as its quality or strength is concerned, the proportion of essential oil in extender material being from about 70% up to about 99%, said extender material being an acylated dimerization product of an alpha methyl styrene or a methyl or other C.sub.2 -C.sub.4 lower alkyl homologue thereof or hydrogenated derivative thereof or mixture of same.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: April 22, 1980
    Assignee: International Flavors & Fragrances Inc.
    Inventors: John B. Hall, Wilhelmus J. Wiegers, Ira D. Hill, Robert M. Novak, Frederick L. Schmitt
  • Patent number: 4198535
    Abstract: A process for producing a linear unsaturated dimer of .alpha.-alkyl styrenes by heating .alpha.-alkyl styrenes in the presence of a silica-alumina catalyst, said catalyst consisting of alumina and silica in a weight ratio of 83/17.ltoreq.Al.sub.2 O.sub.3 /SiO.sub.2 .ltoreq.96/4 and being substantially free of alkali is disclosed.
    Type: Grant
    Filed: September 27, 1978
    Date of Patent: April 15, 1980
    Assignee: Mitsui Petrochemical Industries Ltd.
    Inventors: Kazunori Takahata, Hiroshi Hasui