Abstract:
Substituted lactams of the formula ##STR1## can be prepared from lactam N-carboxylates or lactim O-carboxylates of the formulae ##STR2## by thermal or mixed thermal and catalysed CO.sub.2 elimination at 80.degree.-450.degree. C. Lactams substituted on the N atom by aliphatic groups such as those produced herein are useful as industrial aprotic solvents.
Abstract:
This invention concerns processes for preparing cyclic, 5-membered ring, lactams through the carbonylation of allylic substrates in the presence of rhodium catalysts.
Abstract:
Compounds of formula ##EQU1## where X,X' are divalent aliphatic radicals which may be the same or different are heated to decompose them to lactams.
Abstract:
A PROCESS FOR THE PREPARATION OF LACTAMS AND SULFONIC ACID DERIVATIVES OF ACTIVE HYDROGEN-CONTAINING ORGANIC COMPOUNDS OF THE GROUP CONSISTING OF OXIMES, ALCOHOLS, PHENOLS, THIOLS, PRIMARY AMINES AND SECONDARY AMINES, WHICH COMPRISES REACTING A LACTAM-O-SULFONIC ACID WITH A COMPOUND SELECTED FROM THE SPECIFIED ORGANIC COMPOUNDS UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS.
Abstract:
CYCLOHEXANONE IS CONVERTED TO 1,1''-PEROXYDICYCLOHEXYLAMINE WHICH IS THEN HEATED IN THE LIQUID PHASE TO PRODUCE CAPROLACTAM AND CYCLOHEXANONE, WHICH CYCLOHEXAMONE IS RECYCLED AS FEED TO THE PROCESS.
Abstract:
CAPROLACTAM IS PREPARED IN A SINGLE STEP WITHOUT FORMATION OF BY-PRODUCT AMMONIUM SULFATE BY CONTACTING 2-NITROCYCLOHEXANONE AND/OR 2-NITROCYCLOHEXEN-1-O1 WITH HYDROGEN AT A TEMPERATURE RANGING FROM 150* TO 300* C. IN THE PRESENCE OF A LIQUID MEDIUM SUCH AS WATER, ALCOHOLS, ETHERS, BENZENE OR MIXTURES THEREOF AND OF AN ACTIVE HYDROGENATION CATALYST, PERFERABLY IN THE FURTHER PRESENCE OF A NITROGEN-CONTAINING BASIC SUBSTANCE SUCH AS AMMONIA. THIS INVENTION RELATS TO A NOVEL PROCESS FOR THE PREPARATION OF E-CAPROLACTAM.
Abstract:
Catalytic processes for preparing caprolactam, pipecolinic acid, and their derivatives, from lysine or alpha-amino-epsilon-caprolactam starting materials, and products produced thereby. A process for preparing caprolactam or a derivative thereof, the process comprising contacting a reactant comprising lysine or alpha aminocaprolactam with a catalyst and a gas comprising hydrogen gas, in the presence of a solvent. The catalyst may be provided on a support material, such as a transition metal.
Abstract:
The invention relates to a method for the joint production of a cyclic lactam and a cyclic amine by reacting an aliphatic alpha, omega diamine in the gas phase with water and in the presence of a heterogeneous catalyst.