Patents Represented by Attorney Ronald G. Brookens

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  • Preparation of fluorophenols
    Patent number: 4940821
    Abstract: Fluorophenols are prepared by heating a chlorofluorobenzene with water in the presence of a copper salt at a pH of from 3.0 to 6.5.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: July 10, 1990
    Assignee: The Dow Chemical Company
    Inventors: R. Garth Pews, James A. Gall
  • Preparation of 3,4-difluorobenzotrifluoride
    Patent number: 4937396
    Abstract: 3,4-Difluorobenzotrifluoride is prepared by contacting a 3,4-dihalobenzotrifluoride with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: R. Garth Pews, Jack C. Little, James A. Gall
  • Preparation of halofluorobenzenes
    Patent number: 4937397
    Abstract: Chlorofluorobenzenes and difluorobenzenes are prepared by contacting a dichlorobenzene with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: R. Garth Pews, James A. Gall
  • Preparation of N-(-3(((aryl)amino)suldonyl)-1H-1,2,4-triazol-5-yl)amines
    Patent number: 4937350
    Abstract: N-(3-(((2,6-Dihalophenyl)amino)sulfonyl)-1H-1,2,4-triazol-5-yl)amines, intermediates for the preparation of herbicidal substituted 1,2,4-triazolo(1,5-a)pyrimidine-2-sulfonanilides, are directly prepared from an appropriataely substituted 4-bromoaniline and a protected 5-amino-1,2,4-triazole-3-sulfonyl chloride. The improved reaction scheme involves the individual reaction steps of (a) coupling, (b) halogenation and (c) reduction.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: June 26, 1990
    Assignee: The Dow Chemical Company
    Inventors: Ravi B. Shankar, R. Garth Pews
  • Substituted triazoles and their use as fungicides
    Patent number: 4935436
    Abstract: Substituted triazole compounds, their preparation, compositions containing said compounds and the use of said compositions to control fungal infections in plants are disclosed.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: June 19, 1990
    Assignee: The Dow Chemical Company
    Inventors: Lowell D. Markley, Richard B. Rogers, Neil V. Kirby, John W. Liebeschuetz, Peter F. S. Street
  • Substituted oxirane compounds
    Patent number: 4929268
    Abstract: Herbicidal compositions and methods utilizing novel substituted oxirane compounds as active ingredients are disclosed.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: May 29, 1990
    Assignee: The Dow Chemical Company
    Inventor: R. Garth Pews
  • Substituted azoles and their use as fungicides
    Patent number: 4927833
    Abstract: Substituted azole compounds especially substituted imidazole and triazole compounds, their preparation, compositions containing said compounds and the use of said compositions to control fungal infections in plants are disclosed.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: May 22, 1990
    Assignee: The Dow Chemical Company
    Inventors: Neil V. Kirby, Peter F. S. Street, Lowell D. Markley
  • Morpholinyl silanes and use for control of plant diseases caused by fungi
    Patent number: 4927812
    Abstract: Aryl substituted morpholinyl silanes, their preparation, compositions containing said compounds and their use as agricultural fungicides are disclosed.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: May 22, 1990
    Assignees: Atochem North America, Inc., The Dow Chemical Company
    Inventors: Chrislyn M. Carson, Leonard G. Copping, Robert J. Ehr, Melvin H. Gitlitz, Maynard W. McNeil, Peter F. S. Street, John W. Liebeschuetz
  • Enrichment of optical of 2-(4-aryloxyphenoxy)-propionic acids by crystallization as hydrates
    Patent number: 4910309
    Abstract: The optical purity of an optically active 2-(4-aryloxyphenoxy)propionic acid is enriched by formation of the hydrate of the enantiomer in excess and its removal from solution.
    Type: Grant
    Filed: July 8, 1988
    Date of Patent: March 20, 1990
    Assignee: The Dow Chemical Company
    Inventors: Larry D. Kershner, Jimmy J. Tai
  • Fungicidal 4-monohaloacetoacetoacetanilides
    Patent number: 4902715
    Abstract: Compounds of the formula ##STR1## wherein X is a halogen atom, R the same or different substituents in any desired position of the benzene ring, namely, halogen atoms, C.sub.1 -C.sub.3 -alkyl groups, trifluoromethyl groups or cyano groups and n a whole number with a value of 1, 2 or 3, are fungicidally active.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: February 20, 1990
    Assignee: The Dow Chemical Company
    Inventors: Bernd Schilling, Anneliese Reutter, Norman Haberle
  • 3-halosuccinimides
    Patent number: 4900840
    Abstract: The invention concerns fungicidal compounds of the formula ##STR1## wherein R signifies a chlorine, bromine or iodine atom, n 0, 1, 2 or 3 and X, X', Y and Z have the meanings given in the description.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: February 13, 1990
    Assignee: The Dow Chemical Company
    Inventors: Norman Haberle, Anneliese Reutter
  • (Quinolinyl and quinoxalinyloxy)phenoxy alkenols and their use as post emergent herbicides
    Patent number: 4900354
    Abstract: Compounds of the class comprising (quinolinyl and quinoxalinyloxy)phenoxy) alkenols, e.g., 4-(4-((6-chloro-2-quinolinyl)oxy)phenoxy)-2-penten-1-ol; and a method of preparation, comprising reacting an appropriately substituted quinoline or quinoxaline, e.g., 2,6-dichloroquinoline, with a phenolic substituted pentenol, e.g., 4-(4-hydroxyphenoxy)-2-penten-1-ol, in the presence of a base and organic solvent under an inert atmosphere with or without heat, and then recovering the product.These compounds are useful as intermediates for preparing various known herbicidal compounds and are useful in their own right as post-emergent herbicides for controlling grassy weeds in the presence of corn plants.
    Type: Grant
    Filed: August 29, 1986
    Date of Patent: February 13, 1990
    Assignee: The Dow Chemical Company
    Inventors: James A. Turner, Paul S. Zorner, Wendy S. Jacks
  • Process for the minimization of racemization in the preparation of optically active ((aryloxy)phenoxy)propionate herbicides
    Patent number: 4897481
    Abstract: One of the routes to prepare optically active 2-(4-aryloxyphenoxy)propionic acid ester herbicide is to couple optically active 2-(4-hydrophenoxy)propionic acid esters with halogenated aromatic or heteroaromatic compounds. Conversion of the optically active 2-(4-hydroxyphenoxy)propionic acid ester into the acid salt prior to the coupling step effectively prevents the racemization that unexpectedly occurs otherwise.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: January 30, 1990
    Assignee: The Dow Chemical Company
    Inventors: Larry D. Kershner, Jimmy J. Tai
  • Herbicidal cyanofluorophenoxyphenoxyalkanoic acids and derivatives thereof
    Patent number: 4894085
    Abstract: Novel 2-(4-(2'-fluoro-4'-cyanophenoxy)phenoxy)alkanoic acids and agriculturally acceptable derivatives thereof are selective postemergent herbicides for the control of grassy weeds in valuable crops. The novel herbicides are surprisingly selective, i.e., exhibit little or no phytotoxic effects, to wheat, barley and especially rice at concentrations that control undesired weed grasses.
    Type: Grant
    Filed: November 29, 1988
    Date of Patent: January 16, 1990
    Assignee: The Dow Chemical Company
    Inventors: R. Garth Pews, Lucinda A. Jackson, Chrislyn M. Carson
  • Method and composition for enhancing the insecticidal activity of certain organophosphorus compounds
    Patent number: 4892732
    Abstract: The insecticidal activity of certain pyridinyl phosphorus compounds is enhanced by the admixture therewith of certain 2,4-disubstituted-5-pyrimidinyl phosphoramidothioates.
    Type: Grant
    Filed: January 12, 1989
    Date of Patent: January 9, 1990
    Assignee: The Dow Chemical Company
    Inventors: Doris L. Parconagian, Donald H. DeVries, Mark J. Costales, Walter Reifschneider
  • Insecticidal polymeric compositions
    Patent number: 4888174
    Abstract: The rate of migration of O-halopyridyl phosphate insecticides from polyethylene articles is retarded. Incorporation of a copolymer having a comonomer which is an unsaturated 3 to 5 carbon atom carboxylic acid, or a derivative thereof, decreases the rate of insecticide loss from such articles, particularly films.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: December 19, 1989
    Assignee: The Dow Chemical Company
    Inventors: Richard A. Farquharson, Edwina B. Mitchell
  • Dehydrohalogenation of ring-halogenated .alpha.-halocumenes
    Patent number: 4861927
    Abstract: A process for preparing ring-halogenated .alpha.-methylstyrenes from the corresponding .alpha.-halocumenes is disclosed. The dehydrohalogenation is accomplished using only water and optionally an organic solvent. The process eliminates the need for added base and a phase-transfer catalyst.
    Type: Grant
    Filed: October 5, 1988
    Date of Patent: August 29, 1989
    Assignee: The Dow Chemical Company
    Inventor: Mark R. Johnson
  • Alditol ester derivative of triclopyr, and herbicidal use thereof
    Patent number: 4857102
    Abstract: Alditol ester derivatives of triclopyr are prepared and used as postemergent herbicides in cereal grain crop areas to kill and control various weeds.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: August 15, 1989
    Assignee: The Dow Chemical Company
    Inventors: Nicholas Dennis, Donald C. Burrell
  • Substituted oxirane compounds
    Patent number: 4851594
    Abstract: Novel substituted styrene compounds of the formula ##STR1## wherein R is halogen or --CF.sub.3 ; n is an integer from 0 to 5; and X.sub.1, X.sub.2, X.sub.3, X.sub.4 and X.sub.5 are halogen, and are useful as intermediates for preparing herbicidal compounds.
    Type: Grant
    Filed: July 21, 1986
    Date of Patent: July 25, 1989
    Assignee: The Dow Chemical Company
    Inventor: R. Garth Pews
  • 2,3-Difluoropyridine and 3-fluoro-2-pyridinyloxyphenol compounds
    Patent number: 4851539
    Abstract: Certain novel pyridinyloxyphenoxy alkanoic acids, pyridinylthiophenoxy alkanoic acids, derivatives thereof and related compounds are described. More specifically, these novel compounds bear a fluorine substituent in the 3-position of the pyridinyl group and in the 5-position the substituent is selected from chlorine, CF.sub.3, CF.sub.2 Cl or CF.sub.2 H. These novel compounds exhibit surprising preemergent and postemergent activity in the control of grassy weeds.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: July 25, 1989
    Assignee: The Dow Chemical Company
    Inventors: Howard Johnston, Lillian H. Troxell