Abstract:
A PROCESS FOR PRODUCING LACTAMS FROM CYCLOALKANES IS DISCLOSED. CYCLOALKANES ARE REACTED WITH NITROSYL CHLORIDE WHILE SUBJECTED TO IRRADIATION, IN THE PRESENCE OF A NITRILE WHICH DOES NOT CONTAIN ANY METHYLENE GROUPS CAPABLE OF REACTING WITH NITROSYL UNDER THE REACTION CONDITIONS. WLACTAMS ARE DIRECTLY PRODUCED BY HEATING THE REACTION PRODUCT.
Abstract:
The present invention relates to certain salts of a 11-(2-pyrrolidin-1-yl-ethoxy)-14,19-dioxa-5,7,26-triaza-tetracyclo[19.3.1.1(2,6).1(8,12)]heptacosa-1(25),2(26),3,5,8,10,12(27),16,21,23-decaene (Compound I) which have been found to have improved properties. In particular the present invention relates to the citrate salt of this compound. The invention also relates to pharmaceutical compositions containing the citrate salt and methods of use of the citrate salt in the treatment of certain medical conditions.
Abstract:
ε-Caprolactam is produced by the method comprising the step of introducing a gas comprising cyclohexanone oxime into a layer of solid catalyst particles through a plurality of holes of a gas diffusion plate so that the solid catalyst particles are brought into contact with the gas, while fluidizing the catalyst layer, wherein the holes have an average diameter of about 3 mm or smaller. In accordance with the production method, ε-caprolactam can be produced from a raw material gas comprising cyclohexanone oxime with a high conversion of cyclohexanone oxime and a high selectivity to ε-caprolactam.
Abstract:
Process for the preparation of .omega.-lactams (in particular caprolactam)ith improved yields, by reaction of cycloaliphatic derivatives having the general formula: ##STR1## wherein n=3-13 with nitrosating agents in the presence of dehydrating agents, characterized by the fact that the reaction is carried out a low temperature which is constant between stages, and in all the zones of a stage and with particular concentrations of the dehydrating agent.
Abstract:
The invention relates to a process for the preparation of lactames according to the so-called "Beckmann rearrangement" which consists in isomerizing oximes in a sulfuric solution, the weight ratio percentage of sulfuric acid to the combined amount of sulfuric acid and water being raised to a value above that of the sulfuric solution feed.
Abstract:
A METHOD FOR PREPARING CAPROLACTAM BY THE STEPS OF (1) NITRO-OXIDIZING CYCLOHEXENE TO 2-NITROCYCOLHEXANONE, (2) CLEAVING AND ESTERIFYING 2-NITROCYCLOHEXANONE WITH AN ALCOHOL TO FORM AN ALKYL 6-NITROHEXANOATE AND (3) CATALYTICALLY HYDROGENATING AND CYCLIZING THE NITROESTER TO CAPROLACTAM.
Abstract:
THERE IS DESCRIBED A PROCESS FOR THE PREPARATION OF OMEGA-LACTAMS HAVING THE GENERAL FORMULA:
O=C WHEREIN N= FROM 2 TO 13, AND/OR OF THEIR LACTAMIZABLE PRECURSORS, WHICH MAY BE CYCLOALIPHATIC OXIMES OR CYCLOALIPHATIC NITROSO DERIVATIVES, MONOMERS OR DIMERS CHARACTERIZED BY THE FACT THAT THE CORRESPONDING CYCLOMETHYLENE KETENE, HAVING THE GENERAL FORMULA
O=C=C WHERE N HAS THE AFOREMENTIONED VALUE, IS SUBJECTED TO NITROSATION WITH A NITROSATING AGENT OF THE FORMULLA NOX, WHERE X CAN BE -HSOBJ4, -CL, -NO2, -OR (IN WHICH R INDICATES AN ALKYL OR ARYL ORGANIC SUBSTITUENT), AT A TEMPERATURE COMPRISED BETWEEN -60*C. AND + 100*C.
Abstract:
E-CAPROLACTAM IS PREPARED FROM A CYCLOHEXANE OXIDATION PRODUCT CONTAINING CYCLOHEXYL HYDROPEROXIDE AND OXIDATION BY-PRODUCTS INCLUDING 6-HYDROPEROXY-HEXANOIC ACID, WHICH HAS BEEN OBTAINED BY LIQUID PHASE OXIDATION OF CYCLOHEXANE, WITHOUT A METAL CATALYST, USING A MOLECULAR OXYGEN CONTAINING GAS, BY WASHING THE OXIDATION PRODUCT WITH WATER, SEPARATING THE RESULTING AQUEOUS PHASE CONTAINING 6-HYDROPEROXYHEXANOIC ACID AND HEATING THE ACID UNDER PRESSURE WITH AMMONIA AND HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST.