摘要:
The present invention relates to a new chemical synthesis, intermediates and catalysts useful for the preparation of the neprilysin (NEP) inhibitor sacubitril. It further relates to new intermediate compounds and their use for said new chemical synthesis route.
摘要:
A biphenyl diester useful as a plasticizer having the formula (I): wherein R1 is an alkyl group having 5 to 15 carbon atoms and R2 is a methyl group or a phenyl group.
摘要:
The synthesis of discrete, air, protic, and thermally stable transition metal NNC complexes that catalyze the CH activation and functionalization of alkanes and arenes is disclosed. Methods for the selective conversion of methane to methanol or methyl esters in acidic and neutral media are disclosed.
摘要:
A process for the oxidation of methane to methanol has been developed. The process involves contacting a gas stream, comprising methane, a solvent and an oxidizing agent with a bimetallic catalyst at oxidation conditions to produce a methyl ester. Finally, the methyl ester is hydrolyzed to yield a methanol product stream. The bimetallic catalyst comprises at least two transition metal components. One example of the catalytic component is a combination of cobalt and manganese.
摘要:
Methanol is produced from bacterially oxidized waste methane by reaction with Pd+2, Cu+2 air, and molten phthalic anhydride in an entrained oxidizer generating half ester of methyl phthalate which is reaction distilled to prodtice methanol and recycle phthalic anliydride containing the Pd+2,Cu+2 phthalate catalyst.
摘要:
A new process for the production of triiodotrimesic acid that is used as an intermediate product for the synthesis of x-ray contrast media is described.
摘要:
This invention is a process for converting lower alkanes into their corresponding esters and optionally into various intermediates (such as methanol) and other liquid hydrocarbons. The alkanes are oxidatively converted to oxy-esters at high selectivity using catalytic amounts of a Group VIII noble metal. If so desired, the alkyl oxy-esters may be converted to alcohols or other intermediates such as alkyl halides. The oxy-esters, alcohols, and other intermediates may optionally be converted to liquid hydrocarbons such as gasoline.
摘要:
Disclosed is a vapor phase catalytic oxidation process for preparing an aliphatic carboxylic acid ester of a monoaromatic compound having 1 to 2 hydroxymethyl substituents, such as benzyl acetate, p-methylbenzyl acetate, p-xylylenediacetate, benzyl propionate and benzyl butyrate. A gaseous feed comprised of a benzene compound having 1 to 2 methyl substituents, an aliphatic monocarboxylic acid having 2 to 4 carbon atoms and molecular oxygen is contacted with an improved catalyst. The metal ingredients of the catalyst consist essentially of (a) palladium, (b) arsenic and (c) at least one metal selected from alkali metals and alkali earth metals, and the atomic ratio of palladium:arsenic:the alkali or alkali earth metal is 1:0.05-4:0.1-10.
摘要:
A carboxylic ester of a substituted benzene compound having one or two hydroxymethyl groups on the benzene ring is prepared by reacting a benzene compound selected from the group consisting of toluene and xylene, an aliphatic carboxylic acid, and molecular oxygen in the gaseous phase, in the presence of a catalyst, wherein the improvement comprises reacting said reactants over a supported catalyst wherein the active constituents comprise (1) palladium, (2) an antimony component substantially as the oxide thereof and (3) at least one carboxylic acid salt of an alkali metal, alkaline earth metal, zinc, cadmium or lead, on a carrier.
摘要:
A carboxylic ester is prepared by reacting a hydrocarbon selected from monoolefins having 2 to 6 carbon atoms, benzene, toluene and xylene with an aliphatic saturated carboxylic acid having 2 to 4 carbon atoms and molecular oxygen in the vapor phase in the presence of a supported solid catalyst of palladium metal, an antimony component and a carboxylic acid salt of alkali metal, alkaline earth metal, zinc, cadmium, lead or tin, with the improvement comprising: adding said antimony compound to the support of said catalyst by dipping a carrier into an aqueous solution of water-soluble antimony compound selected from the group consisting of antimonic acid, antimonates and antimony complexes of organic acids.