Abstract:
A process for preparing a polymer, which comprises a) reacting a mixture (I) containing 6-aminocapronitrile and water in the presence of a catalyst to obtain a mixture (II) containing caprolactam, ammonia, water, high boilers and low boilers, then b) removing ammonia from mixture (II) to obtain a mixture (III) containing caprolactam, water, high boilers and low boilers, then c) removing all or some of the water from mixture (III) to obtain a mixture (IV) containing caprolactam, high boilers and low boilers and then d) feeding mixture (IV) to a polymerization reaction,and also the polymer obtainable by this process, the use of the polymer for producing fibers, sheetlike structures and moldings, and also fibers, sheetlike structures and moldings obtainable using such a polymer.
Abstract:
A process for the preparation of caprolactam is provided, wherein a) a mixture (I) containing 6-aminocapronitrile and water is reacted in the liquid phase, in the presence of a catalyst, to give a mixture (II) containing caprolactam, ammonia, water, high-boiling components and low-boiling components, b) ammonia is then removed from the mixture (II) to give a mixture (III) containing caprolactam, water, high-boiling components and low-boiling components, c) water is then removed from the mixture (III) to give a mixture (IV) containing caprolactam, high-boiling components and low-boiling components, and d) a solid (V) containing caprolactam is then obtained from the mixture (IV) by crystallization, the proportion by weight of caprolactam in the solid (V) being greater than in the mixture (IV).
Abstract:
Process for the preparation of a mixture of .epsilon.-caprolactam, 6-aminocaproic acid and 6-aminocaproic amide by heating an aqueous mixture containing ammonia and oligomers of 6-aminocaproic acid and/or of 6-aminocaproic amide, the aqueous mixture containing 0.5-7 wt. % of equivalent ammonia (calculated as NH.sub.3) and the temperature lying between 280.degree. C. and 330.degree. C., in which by "equivalent ammonia" is meant free ammonia and ammonia present in the form of a terminal amide group of one of the compounds present in the aqueous mixture.
Abstract:
This invention relates in part to processes for producing one or more substituted or unsubstituted epsilon caprolactams, e.g., epsilon caprolactam, which comprises: (a) subjecting one or more substituted or unsubstituted alkadienes to hydroxycarbonylation in the presence of a hydroxycarbonylation catalyst, e.g., a metal-organophosphorus ligand complex catalyst, and neutralization with a base to produce one or more substituted or unsubstituted pentenoic acid salts; (b) subjecting said one or more substituted or unsubstituted pentenoic acid salts to hydroformylation in the presence of a hydroformylation catalyst, e.g., a metal-organophosphorus ligand complex catalyst, to produce one or more substituted or unsubstituted formylvaleric acid salts and/or one or more substituted or unsubstituted epsilon caprolactam precursors; and (c) subjecting said one or more substituted or unsubstituted formylvaleric acid salts and/or said one or more substituted or unsubstituted epsilon caprolactam precursors to reductive amination in the presence of a reductive amination catalyst and cyclization optionally in the presence of a cyclization catalyst to produce said one or more substituted or unsubstituted epsilon caprolactams. This invention also relates in part to reaction mixtures containing one or more substituted or unsubstituted epsilon caprolactams as the principal product(s) of reaction.
Abstract:
The invention relates to novel 2-bromo- and 2-nitroxy derivatives of 3-,bromo- and 3-dibromo-4-oxo-azetidines, to processes for the preparation thereof and to the use thereof.According to the invention 2-bromo- and 2-nitroxy derivatives of 3-bromo- and 3-dibromo-4-oxo-azetidines are prepared by reacting derivatives of protected penicillanic lanic acid 1,1-dioxides with DBN reactant (1,5-diazabicyclo/3.4.0/non-5-ene) and then the obtained DBN salt of sulfinic acid or isolated sulfinic acid is treated with thionyl chloride and, after eliminating thionyl chloride by evaporation, the obtained residue is passed through a silica gel column with methylene chloride or some other solvent as eluant or the obtained residue is dissolved in tetrahydrofuran or some other suitable solvent and treated with tetrabutyl ammonium bromide and after the treatment a derivative of 2-bromo, 3-bromo or 2-bromo-3,3-dibromo-4oxo-azetidine is isolated, which derivative may be subjected to a reaction with silver nitrate in 2-propanol and, after the treatment of the reaction mixture, derivatives of 2-nitroxy-, 3-bromo- or 2-nitroxy-3,3-dibromo-4-oxo-azetidine are isolated.The obtained substances are useful intermediates in the syntheses of beta lactam analogons or as components in formulations having antibacterial, inhibitory, anti-tumour or antagonistic action.
Abstract:
The azetidines of the present invention have the formula I ##STR1## wherein R.sup.1 is hydrogen or bromine, R.sup.2 is hydrogen or bromine, wherein at least one of R.sup.1 or R.sup.2 is bromine, R.sup.3 is hydrogen; Me.sub.2 --C.dbd.C--COOR.sup.4 wherein R.sup.4 is hydrogen, methyl, benzyl or some other carboxy-protective group, and X is bromine or nitroxy group (--ONO.sub.2). According to the invention 2-bromo- and 2-nitroxy derivatives of 3-bromo- and 3-dibromo-4-oxo-azetidines are prepared by reacting derivatives of protected penicillanic acid 1,1-dioxides with DBN reactant (1,5-diazabicyclo/3.4.0/non-5-ene) and then the obtained DBN salt of sulfinic acid or isolated sulfinic acid is treated with thionyl chloride and, after eliminating thionyl chloride by evaporation, the obtained residue is passed through a silica gel column with methylene chloride or some other solvent as eluant or the obtained residue is dissolved in tetrahydrofuran or some other suitable solvent and treated with tetrabutyl ammonium bromide and after the treatment a derivative of 2-bromo, 3-bromo or 2-bromo-3,3-dibromo-4-oxo-azetidine is isolated, which derivative may be subjected to a reaction with silver nitrate in 2-propanol and, after the treatment of the reaction mixture, derivatives of 2-nitroxy-, 3-bromo- or 2-nitroxy-3,3-dibromo-4-oxo-azetidine are isolated. The obtained substances are useful intermediates in the syntheses of beta lactam analogons or as components in formulations having antibacterial, inhibitory, antitumour or antagonistic action.
Abstract:
Pyrrolidone-2, or N-substituted derivatives thereof, is prepared by heating an aqueous solution of the corresponding 2-amino-.DELTA. .sup.1 -pyrroline at a temperature of 90.degree.-290.degree. C. The process does not require the use of a Raney nickel catalyst and produces the pyrrolidone-2 product in substantial yields.
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 new species of Micromonospora, designated Micromonospora lacustris sp. nov. Routien, when subjected to submerged aerobic fermentation under controlled conditions, produces a mixture of at least 13 antibiotics. Two of these antibiotics are rifamycin S and rifamycin SV. Two other members of the antibiotic mixture are the 3-thiomethyl derivatives of rifamycin S and rifamycin SV.