Plural Rings Each Having Boron, Carbon And Oxygen As Ring Members Patents (Class 558/290)
  • Heterocyclic boron compounds
    Patent number: 4751017
    Abstract: Heterocyclic boron compounds of the formula IR.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --R.sup.2 (I)can be used as components of liquid-crystal phases. A.sup.1 is --A--, --A.sup.4 --A--, or --A--A.sup.4 -- and A is ##STR1## .
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: June 14, 1988
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Andreas Wachtler, Joachim Krause, Rudolf Eidenschink, Jurgen Eichler, Bernhard Scheuble
  • Process for producing catecholborane
    Patent number: 4739096
    Abstract: A process is described in which catecholborane is produced by a reaction of a phenolic compound with a boron hydride in a solvent. Tris(catecholato)bisborane, i.e. the ester of boric acid and catechol, is reacted with an alkali metal-boron hydride in an aliphatic ether. A lithium halide is suitably used too, where sodium-boron hydride or potassium-boron hydride is employed. In a preferred embodiment, the reaction is carried out in conjunction with an activating grinding operation.
    Type: Grant
    Filed: August 7, 1986
    Date of Patent: April 19, 1988
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Heinrich Noth, Detlef Mannig
  • Catalysts for the preparation of carbodiimide foams and elastomers
    Patent number: 4611013
    Abstract: New compounds which are salts of the formula A.sup.+ B.sup.- where A.sup.+ is a quaternary ammonium cation and B.sup.- is a tetrahedral boron-oxygen complex anion are prepared from boric acid by reaction with a hydroxyl compound and a quaternary ammonium hydroxide. The salts are used as catalysts to prepare carbodiimides and isocyanurates from isocyanates which can be in the form of foamed resins.
    Type: Grant
    Filed: June 12, 1984
    Date of Patent: September 9, 1986
    Assignee: BP Chemicals Limited
    Inventor: Kaneyoshi Ashida