摘要:
A Group IIA metal-Group IIIA metal-silicon substantially homogeneous liquid alkoxide is prepared from a reaction mixture of a Group IIA metal, a Group IIIA metal, a silicon tetraalkoxide, and a liquid defined by the formula ROR' where R is an alkyl group and R' is hydrogen or an alkyl group. The alkoxide can then be hydrolyzed, azeotropically distilled, dried, milled, and calcined to produce a ceramic powder. Advantageously, the ceramic powder can be compacted and sintered at relatively low temperatures which enable it to be used in electrical applications where high sintering temperatures would be deleterious.
摘要:
There are disclosed improved methods for preparing metal alkoxides from metals and alcohols. The methods involve dry-grinding the metal in an inert atmosphere prior to the addition of the alcohol. When an activator is used, it is usually ballmilled with the metal. Higher yields are obtained, particularly when the metal and alcohol are not very reactive absent an activator. Typical metals are those from Groups 2A, 2B, 3A, and 3B, particularly aluminum, magnesium, and yttrium. Typical alcohols are those which contain up to 16 carbon atoms, particularly those containing 4 or more carbon atoms.
摘要:
A pharmaceutical compound with therapeutic, prophylactic and cosmetic properties for human and veterinary use, being a zinc glycerolate complex formed as a reaction product of zinc oxide and glycerol having a platy morphology with generally hexagonal crystals (1/2/3) of relatively low thickness and high lubricity, with or without further reaction products or carriers.
摘要:
Alkyl vanadates are prepared by the reaction of vanadium pentoxide and an alkyl alcohol while heating in the presence of an alkane azeotroping agent to assist in the removal of water by-product.
摘要:
Aluminum alkoxides are prepared by the reaction of impure aluminum and monohydric alcohols in a process wherein impure metallic aluminum particles are continuously fed at a metered rate into a stoichiometric excess of alcohol. The novel apparatus disclosed permits the continuous introduction of the aluminum particles into the reactor and removal of non-reactive impurities through columns of ambient temperature alcohol which avoids contact of atmospheric oxygen with the reaction products.
摘要:
A novel process is described for the preparation of novel organic solutions of organooxy magnesium compounds of low viscosity, which solutions are formed in the presence of at least 5 mol % based on the magnesium compound of an organooxy compound of a transition metal of Groups IV through VI of the Periodic Table.
摘要:
An improved method for preparing organic vanadates by reacting vanadium oxytrichloride with an alcohol in the presence of ammonia and a hydrocarbon solvent and thereafter adding dimethyl sulfoxide to form two phases, one phase containing the organic vanadates and the other phase being an ammonium chloride-dimethyl sulfoxide suspension.
摘要:
An improved method for preparing ethyl vanadate by reacting vanadium oxytrichloride with ethanol in the presence of ammonia and a hydrocarbon solvent and thereafter adding an amide which forms two liquid phases, one phase containing the ethyl vanadate and the other containing the undissolved ammonium chloride.
摘要:
A method is disclosed for forming stannic tetra-(tertiary-alkoxides) wherein the alkoxide groups contain from 4 to 8 carbon atoms, which process includes starting with a tin tetrahalide and involves reactions with an alkylamine and a tertiary alcohol. The resulting products are volatile tin compounds and find utility as a source of tin oxide. For example, the compounds may be hydrolyzed with water and then pyrolyzed to provide a source of ultra high purity tin oxide.
摘要:
DOUBLE METAL ALKOXIDES OF THE FORMULA M(AI(OR)4)2 ARE CONVERTED BY PYROLYSIS, OR HYDROLYSIS AND PYROLYSIS, TO ULTRA-PURE COMPOUNDS CORESSPONDING TO THE FORMULA MAI2O4 WHEREIN M IS MAGNESIUM OR CALCIUM AND R IS AN ALKYL GROUP CONTAINING FROM 1 TO 7 CARBON ATOMS.