Patents Assigned to Boots Hercules Agrochemicals Co.
  • Process for producing O,O-dialkyl dithiophosphoric acid esters
    Patent number: 4283338
    Abstract: Disclosed is a method for improving the yield of dialkyl dithiophosphoric acid esters produced by the Lewis acid catalyzed reaction of an O,O-dialkyl dithiophosphoric acid and an organic chloride. More specifically, the method concerns the improvement wherein the reaction is conducted under sufficient pressure to maintain the liberated hydrogen chloride in the reaction system during the course of the reaction.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: August 11, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: James Minn
  • Process for producing dialkyl dithiophosphoric acid esters
    Patent number: 4283335
    Abstract: Disclosed is a method for improving the yield of dialkyl dithiophosphoric acid esters produced by the Lewis acid catalyzed reaction of an O,O-dialkyl dithiophosphoric acid and an organic chloride. More specifically, the method concerns the improvement wherein the reaction is carried out in the presence of from 0.1 to 1.5 moles, per mole of organic chloride, of an anhydride of a fatty acid containing 2 to 5 carbon atoms.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: August 11, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: James Minn
  • Process for preparing esters of O,O-dialkyl dithiophosphoric acid
    Patent number: 4282153
    Abstract: Disclosed is a method for improving the yields of insecticidal compositions produced by reacting an O,O-dialkyl dithiophosphoric acid with a chloro-p-dioxane in the presence of a Lewis acid catalyst and a stoichiometric excess of the acid reactant. More specifically, the method concerns the improvement wherein certain bicyclo-heptenes are added to the system resulting from the reaction and reacted with the excess of O,O-dialkyl dithiophosphoric acid present in the system.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: August 4, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: James Minn
  • Process for hydrolyzing 5-isothiocyano-5,6-dihydro-dicyclopentadiene
    Patent number: 4263226
    Abstract: 5-Amino-5,6-dihydro-dicyclopentadiene is prepared by reacting 5-isothiocyano-5,6-dihydro-dicyclopentadiene and an aqueous caustic medium at a temperature in excess of the melting point of 1,3-bis[5-(5,6-dihydro-dicyclopentadiene)]-2-thiourea while establishing and maintaining a pressure sufficient to maintain the water in the reaction mixture in a liquid state.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: April 21, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: Melvin M. Pombo
  • Solvent process for hydrolyzing 5-isothiocyano-5,6-dihydrodicyclopentadiene
    Patent number: 4259260
    Abstract: 5-Isothiocyano-5,6-dihydro-dicyclopentadiene is hydrolyzed with caustic to 5-amino-5,6-dihydro-dicyclopentadiene in a reaction medium comprising a polar organic liquid which is inert under the reaction conditions and which at least partially dissolves the reactants and products.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: March 31, 1981
    Assignee: Boots Hercules Agrochemicals Co.
    Inventor: William R. Diveley