摘要:
Dihydrooxadiazinones are provided which can be used as blowing agents in various thermoplastic polymeric materials to produce high performance thermoplastic foams. A ketone having at least one .alpha.-hydrogen atom is halogenated and hydroxylated to produce an .alpha.-hydroxyketone. Condensation of the .alpha.-hydroxyketone with an organocarbazate produces the corresponding carboorganooxyhydrazone which is cyclized to a dihydrooxadiazinone.
摘要:
Dihydrooxadiazinones are provided which can be used as blowing agents in various thermoplastic polymeric materials to produce high performance thermoplastic foams. A ketone having at least one .alpha.-hydrogen atom is halogenated and hydroxylated to produce an .alpha.-hydroxyketone. Condensation of the .alpha.-hydroxyketone with an organocarbazate produces the corresponding carboorganooxyhydrazone which is cyclized to a dihydrooxadiazinone.
摘要:
Organic amines, amino acids, polyamides and vinylpolymers are fluorinated by the action of fluorine in liquid hydrogen fluoride optionally containing boron trifluoride or antimony pentafluoride at about -80.degree. to 15.degree. C. and optionally under irradiation with light.
摘要:
3-Fluoro-D-alanine, its pharmacologically acceptable esters, and pharmacologically acceptable salts of the foregoing, as well as other pharmacologically acceptable derivatives of 3-fluoro-D-alanine which, when administered clinically, are effective in releasing 3-fluoro-D-alanine in vivo, are potent antibacterial agents, and are prepared by fluorination of D-alanine with fluoroxyperfluoroalkanes or fluoroxypentasulfur in the presence of a free radical initiator followed by esterification and/or treatment with acids or bases.
摘要:
Dialkylaminosulfur trifluorides such as diethylaminosulfur trifluoride are useful in replacing hydroxyl group and carbonyl oxygen with fluorine in various organic compounds.
摘要:
A process for producing selected brominated aromatic or heteroaromatic compounds and fluoroform comprising reacting in the vapor phase a selected aromatic or nitrogen substituted heteroaromatic reactant and trifluoromethylbromide.
摘要:
A novel fluorination catalyst and its preparation, by reacting a hydrated oxide of trivalent chromium with hydrogen fluoride, is described as having utility in fluorinating halogenated aliphatic hydrocarbon.
摘要:
Organic compounds having at least one replaceable hydrogen atom are fluorinated in the liquid or solid state by treatment with fluoroxyperfluoroalkanes or fluoroxypentafluorosulfur under the influence of a free radical initiator.
摘要:
A PROCESS FOR THE PREPARATION OF A FLUORINATION CATALYST WHEREIN CHROMIUM AND NICKEL SALTS OF ORGANIC ACIDS ARE TREATED AT AN ELEVATED TEMPERATURE UNDER VACUUM OR IN AN INERT ATMOSPHERE TO PRODUCE NON-STOICHIOMETRIC INORGANIC COMPOUNDS IN WHICH THE CHROMIUM HAS A VALENCE BETWEEN 2 AND 3 AND THE NICKEL HAS A VALENCE BETWEEN 0 AND 2, AND THE MIXTURE OF THE NON-STOICHIOMETRIC COMPOUNDS THEREBY OBTAINED IS SHAPED AND IS THEN CONTACTED WITH ANHYDROUS HYDROGEN FLUORIDE AT AN ELEVATED TEMPERATURE. THE CATALYSTS OF THE PRESENT INVENTION ARE USEFUL IN THE PREPARATION OF PERFLUORO COMPOUNDS BY REACTION OF PERHALOGENATED COMPOUNDS WITH HYDROGEN FLUORIDE.
摘要:
FLUORINATION OF HALOGENATED ALIPHATIC HYDROCARBON IS EFFECTED BY REACTING SAID HYDROCARBONS WITH HYDROGEN FLUORIDE IN GASEOUS PHASE AT ELEVATED TEMPERATURES IN THE PRESENCE OF A CATALYST, THE EMPIRICAL COMPOSITION OF WHICH VARIES SUCH AS BETWEEN CRF1.5O1.5 AND CRF2O OR A CATALYST, THE EMPIRICAL COMPOSITION OF WHICH VARIES SUCH AS BETWEEN CRFO2 AND CRF2O.