摘要:
This invention relates to a process for producing a mixture of levulinic acid esters and formic acid esters from biomass and olefins, and the composition prepared therefrom. This invention also relates to usage of the mixture of these esters as fuel additives for gasoline fuel, diesel fuel, and biofuel.
摘要:
This invention relates to a process for separating one or more orgnnophosphorus ligand degradation products, one or more reaction byproducts and one or more formylester products from a reaction product fluid comprising one or more unreacted unsaturated ester reactants, a metal-organophosphorus ligand complex catalyst, optionally free organophosphorus ligand, said one or more organophosphorus ligand degradation products, said one or more reaction byproducts, said one or more products, a polar solvent and a nonpolar solvent by phase separation wherein (i) the selectivity of the polar phase for the organophosphorus ligand with respect to the one or more products is expressed by a partition coefficient ratio Ef1 which is a value greater than about 2.5, (ii) the selectivity of the polar phase for the organophosphorus ligand with respect to the one or more organophosphorus ligand degradation products is expressed by a partition coefficient ratio Ef2 which is a value greater than about 2.5, and (iii) the selectivity of the polar phase for the organophosphorus ligand with respect to the one or more reaction byproducts is expressed by a partition coefficient ration Ef3 which is a value greater than about 2.5.
摘要:
The invention relates to synthesis methods for the preparation of the intermediates, which are suitable for the preparation of statin derivatives, especially to synthesis methods of the intermediate of formula (VI) wherein Ra' and Rc' are each independently of the other hydrogen or hydroxy-protecting group or together are a bridging hydroxy-protecting group, and Rb is a carboxy-protecting group, which methods are carried out by conversion of the intermediate of formula (XVI) wherein Ra' and Rc' are each independently of the other hydrogen or a hydroxy-protecting group, R* and R** are each independently of the other hydrogen or an amide-protecting group, and Rb is a carboxy-protecting group; which methods proceed to further intermediates and methods for their preparation.
摘要:
Verfahren zur Herstellung von Mono- oder Biscarbonyl- oder Hydroxylverbindungen durch Ozonisierung von ungesättigten organischen Kohlenstoffverbindungen, die eine oder mehrere durch Ozon spaltbare olefinischen aromatischen Doppelbindungen im Molekül aufweisen und anschließender Aufarbeitung der Ozonisierungsprodukte, wobei ungesättigte organische Kohlenstoffverbindungen, die eine oder mehrere durch Ozon spaltbare olefinische oder aromatische Doppelbindung im Molekül aufweisen, (a) in einem organischen Lösungsmittel oder in einer wässrigen Lösung in 1 bis 2 Schritten kontinuierlich in einer Vorrichtung bestehend aus ein bis zwei Absorptionsapparaturen, Vorrichtungen zur Abfuhr der Reaktionswärme und Vorrichtungen zum Trennen von Gas- und Flüssigphase, mit gegenläufigen Eduktströmen mit Ozon in stöchiometrischen Mengen oder im Überschuss umgesetzt und (b) die dabei entstehenden Peroxide in Abhängigkeit von den Reaktionsparametern aus Schritt (a) entweder durch kontinuierliche oder diskontinuierliche Hydrierung, Oxidation oder Erwärmen in die entsprechenden Mono- oder Biscarbonyl- oder Hydroxylverbindungen überführt werden.
摘要:
Compounds having the formula or therapeutically acceptable salts thereof, are histone deacetylase (HDAC) inhibitors. Preparation of the compounds, compositions containing the compounds, and treatment of diseases using the compounds are disclosed.
摘要:
Processes for the preparation of pyrrolidones (7 and 8) and pyrrolidines (9 and 10) from tri-O-acetyl-D- erythro -4-pentulosonic acid esters are described. The compounds are aza sugar analogs of D-ribofuranoside and are intermediates to drugs which regulate nucleoside and nucleic acid synthesis.
摘要:
The invention relates to a method for producing compounds of general formula (I) wherein R represents a C1-C20 alkyl group, a C3-C12 cycloalkylgroup, a C7-C12 aralkyl group, or a mono or bicyclic aryl group. A ketone of formula (II) wherein R has the aforementioned meaning is asymmetrically hydrogenated.
摘要:
A 2-fluoro-2-(3-oxocyclopentyl)acetate derivative represented by the formula (1). The compound is useful in the efficient synthesis of a 2-amino-6-fluorobicyclo[3.1.0]hexane-2,6-dicarboxylic acid derivative.
摘要:
This invention relates to a process for separating one or more orgnnophosphorus ligand degradation products, one or more reaction byproducts and one or more formylester products from a reaction product fluid comprising one or more unreacted unsaturated ester reactants, a metal-organophosphorus ligand complex catalyst, optionally free organophosphorus ligand, said one or more organophosphorus ligand degradation products, said one or more reaction byproducts, said one or more products, a polar solvent and a nonpolar solvent by phase separation wherein (i) the selectivity of the polar phase for the organophosphorus ligand with respect to the one or more products is expressed by a partition coefficient ratio Ef1 which is a value greater than about 2.5, (ii) the selectivity of the polar phase for the organophosphorus ligand with respect to the one or more organophosphorus ligand degradation products is expressed by a partition coefficient ratio Ef2 which is a value greater than about 2.5, and (iii) the selectivity of the polar phase for the organophosphorus ligand with respect to the one or more reaction byproducts is expressed by a partition coefficient ration Ef3 which is a value greater than about 2.5.
摘要:
A process for producing an oxide having a higher degree of oxidation than an alcohol, characterized by depositing the alcohol compound and an oxidation catalyst on silica gel and oxidizing the compound with an oxidizing agent; and a process for producing an oxide having a higher degree of oxidation than an alcohol, characterized by depositing the alcohol compound on silica gel and then electrolytically oxidizing the compound.