Abstract:
PROBLEM TO BE SOLVED: To provide a method for commercially and efficiently manufacturing a lactam from a cycloalkane at a high yield using a catalyst being friendly to the environment. SOLUTION: The method for manufacturing a lactam comprising a process A of synthesizing a corresponding cycloalkanone oxime by causing a cycloalkane and a nitrous acid ester to react with each other in the presence of a nitrogen-atom-containing cyclic compound (a) comprising a skeleton represented by formula (i) [wherein X represents an oxygen atom or an -OR group (R represents a hydrogen atom or a protective group of a hydroxy group)] as a component constituting the ring thereof and a process B of converting the resulting cycloalkanone oxime obtained in the process A to form a corresponding lactam by virtue of the Beckmann rearrangement, and also comprises a process of removing the nitrogen-atom-containing cyclic compound (a) in the midst of the process A and/or after completing the process A. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
A method for preparing omega-aminoalkanoic acids by the steps of (1) nitro-oxidizing a cycloalkene to a cyclic alpha-nitroketone, (2) cleaving and esterifying a cyclic alpha-nitroketone with an alcohol to form an alkyl omega-nitroester, (3) catalytically hydrogenating the nitroester to an aminoester and (4) hydrolyzing the aminoester to an aminoalkanoic acid.
Abstract:
A method for the preparation of omega lactams is disclosed, more particularly epsilon caprolactam or a precursor thereof (such as cyclohexanone oxime), using as the starting material a cyclomethylene ketene, with the simultaneous formation of side products such as cyclohexanecarboxylic acid, wherein an adduct is preliminarly formed between cyclomethylene ketene and sulphur dioxide. The adduct is then reacted with a nitrosating agent so as to obtain, under the appropriate reaction conditions, the expected lactam, more specifically epsilon caprolactam.
Abstract:
CYCLODODECYLMETHYL CYCLODOECANECARBOXYLATE IS DISCLOSED AS A NOVEL COMPOSITION OF MATTER WHICH MAY BE NITROSATED WITH NITROSYLSULFURIC ACID TO LAURINLACTAM. THE LACTAM IS CONVERTED BY CONVENTIONAL METHODS INTO NYLON 12. NYLON 12 IS BECOMING AN INCREASINGLY IMPORTANT POLYMER COMPOSITION FOR THE MANUFACTURE OF MOLDED ARTICLES, FIBERS AND THE LIKE. THE PRESENT INVENTION RELATES TO A NOVEL ESTER COMPOSITION OF MATTER WHICH MAY BE EMPLOYED IN THE SYNTHESIS OF LAURINLACTAM WHICH IN TURN IS USED IN THE MANFACTURE OF NYLON 12. THE PRESENT INVENTION ALSO RELATES TO A METHOD FOR MANUFACTURING SUCH ESTER COMPOSITIONS.
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.