Patents Assigned to Makhteshim Chemical Works, Ltd.
  • Patent number: 5091578
    Abstract: N-n-propyl-N-2-(2,4,6-trichlorophenoxy)-ethylamine is prepared by selectively chlorinating 2-phenoxy ethanol by reacting it with chlorine either in the presence of hydrogen chloride at a temperature of from -10.degree. C. to 50.degree. C. or in the presence of urea at a temperature of from 20.degree. C. to 55.degree. C. in a water/carbon tetrachloride solvent mixture to form 2-(2,4,6-trichlorophenoxy)ethanol; reacting the 2-(2,4,6-trichlorophenoxy)ethanol with thionyl chloride in the presence of a catalytic amount of tetraalkyl ammonium chloride, optionally in the presence of a solvent to form 2-(2,4,6-trichlorophenoxy)ethyl chloride; and reacting the 2-(2,4,6-trichlorophenoxy) ethyl chloride with n-propylamine at a temperature of from 20.degree. C. to 150.degree. C., optionally in the presence of water to form N-n-propyl-N-2-(2,4,6-trichlorophenoxy) ethyl amine.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: February 25, 1992
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: Joseph Sharvit, Abraham A. Pereferkovich, Daniel Shohat
  • Patent number: 5091577
    Abstract: N-n-propyl-N-(2,4,6-trichlorophenoxy)-ethyl amine is prepared by reacting 2-phenoxy ethanol with thionyl chloride in the presence of a catalytic amount of tetraalkyl ammonium halide optionally in the presence of a solvent to form 2-phenoxy ethyl chloride; selectively chlorinating the 2-phenoxy ethyl chloride with chlorine at a temperature from 0.degree. C. to 60.degree. C. in the presence of a catalytic amount if urea to form 2-(2,4,6-trichlorophenoxy)-ethyl chloride; reacting the 2-(2,4,6-trichlorophenoxy)-ethyl chloride with n-propyl amine at a temperature of from 20.degree. C. to 150.degree. C., optionally in the presence of water; and recovering the N-n-propyl-N-2-(2,4,6-trichlorophenoxy)-ethyl amine formed.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: February 25, 1992
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: Joseph Sharvit, Abraham A. Pereferkovich
  • Patent number: 4898942
    Abstract: An improved process for the production of Diazinon substantially free of toxic by-products in high yield and very high purity which involves mixing 2-isopropyl-4-methyl-6-hydroxypyrimidine with solid sodium or potassium hydroxide in a ketone or ether solvent at a temperature of about 50.degree.-60.degree. C. until a homogeneous mixture is formed, adding diethylthiophosphoryl chloride to the homogeneous mixture, keeping the mixture at a temperature of 55.degree.-80.degree. C. until the reaction is complete, and separating the Diazinon formed.
    Type: Grant
    Filed: August 30, 1988
    Date of Patent: February 6, 1990
    Assignee: Makhteshim Chemical Works, Ltd.
    Inventors: David Ovadia, Ernestine Mandler
  • Patent number: 4854965
    Abstract: Herbicidal compositions containing 2,4-dioxo-and 2,4-dithio-1,3-dihydroquinazolines and a method of controlling broadleaved weeds in cereals applying to said weeds a herbicidally effective amount of a composition containing said dihydroquinazolines.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: August 8, 1989
    Assignee: Makhteshim Chemical Works, Ltd.
    Inventors: Peretz Bracha, Moshe Korat
  • Patent number: 4810797
    Abstract: 2,3,6-Trichloropyridine and 2,3,5,6-tetrachloropyridine are prepared by continuously reacting chlorine in the gas phase with one or more compounds such as 2,6-dichloropyridine and 2,3,6-trichloropyridine at a temperature of from about 200.degree. C. in the presence of an amount of catalyst effective to catalyze the reaction.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: March 7, 1989
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: Joseph Sharvit, David Lubetzky, Abraham A. Pereferkovich
  • Patent number: 4801716
    Abstract: Heptachloropicoline is prepared by continuously reacting chlorine in the gas phase at an elevated temperature with one or more lower-chlorinated 6-trichloromethyl pyridines in the presence of an effective amount of ferric chloride.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: January 31, 1989
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: Joseph Sharvit, David Lubetzky
  • Patent number: 4752644
    Abstract: 2-Chloropyridine, 2,6-dichloropyridine, 2,3,6-trichloropyridine, and 2,3,5,6-tetrachloropyridine are prepared by reacting alpha-picoline in the gas phase with choline at temperature from about 200.degree. C. in the presence of water and an amount of catalyst effective to catalyze the reaction.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: June 21, 1988
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: Joseph Sharvit, David Lubetzky, Abraham A. Pereferkovich
  • Patent number: 4683322
    Abstract: There is provided a process for the production of alkyl-thiolhydroxamates in high yields and purity. The reaction is effected by contacting a hydroxylamine salt and an S-alkyl thiolimidic ester salt in a suitable solvent in the presence of an ammonium, alkali or alkaline earth metal carbonate or bicarbonate at a low pH and at a temperature in the 25.degree.-50.degree. C. range until the reaction is complete, and recovering the desired product.
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: July 28, 1987
    Assignee: Makhteshim Chemical Works Ltd.
    Inventor: Zohar Oren
  • Patent number: 4551458
    Abstract: There are provided novel haloalkylthio-1,3-dihydro 2,4-dioxo-quinazolines having at least one haloalkylthio substituent in the 1- or 3-position; a process for the preparation of such compounds and fungicidal compositions containing same as active ingredient.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: November 5, 1985
    Assignee: Makhteshim Chemical Works, Ltd.
    Inventors: Peretz Bracha, Solomon Massil
  • Patent number: 4382077
    Abstract: There is provided a solvent system for application of pesticides by fogging, said solvent system being of use with both liquid and solid (wettable powder) pesticides, said solvent system comprising in combination 38 to 80 parts by weight of a glycol or a glycol ether, from 2 to 20 parts by weight of an alcohol of 1 to 3 carbon atoms and 18 to 60 parts by weight of methylene chloride.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: May 3, 1983
    Assignee: Makhteshim Chemical Works Ltd.
    Inventor: Emanuel Buchbinder
  • Patent number: 4292453
    Abstract: The present invention relates to the production of ring-halogenated styrene monomers of high purity. These are of value in the production of polymers which possess flame retardance. The process of the invention comprises reacting heterogenously ring halogenated beta-bromoethyl benzene with a strong aqueous alkali base in the presence of a quaternary phase transfer catalyst until substantially all the bromoethyl benzene has undergone reaction, separating the phases, washing and neutralizing the organic phase and recovering the ring-halogenated styrene monomer, which is the desired product.
    Type: Grant
    Filed: May 24, 1979
    Date of Patent: September 29, 1981
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: Stephen L. J. Daren, David Vofsi, Meir Asscher
  • Patent number: 4284826
    Abstract: Low viscosity chlorine containing polyether polyols, and more specifically a low molecular weight, low viscosity diol oligomer of 4,4,4-trichloro-1,2-epoxybutane of the formula ##STR1## wherein R and R' are each selected from hydrogen and --CH.sub.2 CCl.sub.3,wherein R and R' are different, and wherein n is an integer from 2 to 4; is useful in preparing flame retardant polyurethanes.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: August 18, 1981
    Assignee: Makhteshim Chemical Works Ltd.
    Inventor: David Aelony
  • Patent number: 4210592
    Abstract: The invention relates to compounds having the formula: ##STR1## wherein R is lower alkyl, cycloalkyl and aryl;R.sub.1 is lower alkyl, cycloalkyl, aryl and lower alkoxy;R.sub.2 is hydrogen, methyl, ethyl and ##STR2## R.sub.3 and R.sub.4 are independently lower alkyl, cycloalkyl, aryl or a heterocyclic ring having 5 to 6 members at least 4 of which are carbons and one of which is selected from nitrogen, oxygen and sulfur;R.sub.4 may also be hydrogen, and R.sub.3 and R.sub.4 in combination may be part of a ring having 5 to 6 members at least 4 of which are carbons and the rest are selected from carbon, nitrogen, oxygen and sulfur;Z is oxygen, sulfur, --NH or --NR; andn is 0 or 1.
    Type: Grant
    Filed: November 8, 1977
    Date of Patent: July 1, 1980
    Assignee: Makhteshim Chemical Works, Ltd.
    Inventor: Joseph H. Lesser
  • Patent number: 4110379
    Abstract: Compounds are disclosed of the formula ##STR1## wherein R designates hydrogen or an alkyl group of 1 to 6 carbon atoms, inclusive;R' designates an alkylene group of 2 to 10 carbon atoms, inclusive, or alkylene substituted by a methyl or by a halomethyl group;R" designates hydrogen, an alkyl group of 1 to 4 carbon atoms, inclusive;--R"Z, ##STR2## or C(CH.sub.2 OH).sub.3 X designates chlorine or bromine;Z designates -OH, ##STR3## n is an integer from 1 to 5; and P IS AN INTEGER FROM 0 TO 4.A process for the production of such compounds is also disclosed which comprises reacting one mole or a slight excess of a trihalogenated alkylene oxide of the formula ##STR4## wherein X, R, and p are as defined above, per mole of an alkanolamine or polyamine of the formula ##STR5## wherein R', R", Z, are as defined above, at a temperature between 30.degree. to 90.degree. C and separating the resulting halogenated nitrogen containing polyol.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: August 29, 1978
    Assignee: Makhteshim Chemical Works Ltd.
    Inventors: David Aelony, David Vofsi
  • Patent number: 4087490
    Abstract: Compounds of the formula ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen, alkyl, alkenyl, cycloalkyl, aryl, alkaryl, aralkyl, halogen, cyano, nitro, alkoxy, alkylthio, aryloxy, haloalkyl, and haloaryl, n is 0, 1, 2, 3 or 4; X is oxygen or sulfur, Y is chlorine or bromine and a process for the production of these; and for the conversion of these to valuable insecticides by reacting same with an alkanol.
    Type: Grant
    Filed: July 20, 1976
    Date of Patent: May 2, 1978
    Assignee: Makhteshim Chemical Works, Ltd.
    Inventors: Joseph Herman Lesser, Ludmila Friedman