Abstract:
Gegenstand der Erfindung ist ein Verfahren zur Herstellung von L-Methionin, D-Methionin oder einer beliebigen Mischung von L- und D-Methionin durch chemische Umwandlung von L- oder D-Homoserin oder entsprechenden Mischungen von L- und D-Homoserin, wobei keine der Zwischenstufen N-Carbamoylhomoserin, 4-(2-Brommethyl)hydantoin und 4-(2-Methylthioethyl)hydantoin durchlaufen werden.
Abstract:
The present invention relates to a novel process for the preparation of compounds of the formula (I) by reacting in a first step amino alcohols of the formula (II) with chlorosulfonic acid to give sulfuric acid esters of the general formula (III) and by reacting these sulfuric acid esters in a second step with mercaptans or salts thereof of the general formula (IV): RSM in each formula, where applicable, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R, n and M have the meanings given in the description, in the presence of a diluent and in the presence of a base.
Abstract:
Severely sterically hindered secondary aminoether alcohols are prepared by reacting an organic carboxylic acid or alkali metal salt of an organic carboxylic acid with a sulfonyl halide, a sulfuryl halide, a mixed sulfuryl ester halide or a mixed sulfuryl amide halide to yield a sulfonic-carboxylic anhydride compound which is then reacted with a dioxane to cleave the ring of the dioxane, yielding a cleavage product which cleavage product is then aminated with an alkylamine and hydrolyzed with base to yield the severely sterically hindered secondary aminoether alcohol.
Abstract:
3,3-Dimethylbutanal is prepared from 3,3-dimethylbutanol. Intermediate 3,3-dimethylbutanol is obtained by reacting ethylene, isopropylene and a mineral acid to produce a 3,3-dimethylbutyl ester which is hydrolyzed to the alcohol. The hydrolysis step is effectively carried out by reactive distillation. Alternatively, 3,3-dimethylbutanal is prepared from 3,3-dimethylbutanol obtained by reduction of the corresponding carboxylic acid or 1,2-epoxy-3,3-dimethylbutane, or by hydrolysis of 1-halo-3,3-dimethylbutane. Fixed bed gas phase and stirred tank liquid phase processes are provided for converting 3,3-dimethylbutanol to 3,3-dimethylbutanal by catalytic dehydrogenation.
Abstract:
A method for preparing a fullerene derivative, wherein a fullerene derivative having a group capable of liberating a proton introduced to a carbon atom constituting the fullerene molecule is formed by using a halogenated fullerene formed by halogenating a fullerene molecule as a precursor; a method for preparing a polymerized fullerene derivative, wherein a plurality of fullerene molecules are reacted with an aromatic compound molecule to form a polymer comprising a plurality of fullerene molecules which are bound to one another via the aromatic group of the aromatic compound; a novel and useful proton conductor obtained by using the method; and an electrochemical device, such as a fuel cell, using the proton conductor. The above methods allow the efficient preparation of a fullerene having OH groups or SO3H groups such as fullerenol suitable as a proton conductor. A fullerene derivative prepared by these production methods acts as a proton conductor. The electrochemical device is free from the restriction of atmosphere and thus can be miniaturized and simplified.
Abstract:
The present invention relates to a sulfation process comprising the steps of: a) reacting a tertiary amine with a sulfation precursor having the formula: wherein R1is C1-C22 alkyl, C6-C22 aryl, C7-C22alkylenearyl, and mixtures thereof; to form an admixture comprising a quaternized amine and a sulfating species; and b) reacting a hydroxyl species with said admixture to form a sulfated hydroxyl species. The process of the present invention is adaptable to sulfating a wide range of alcohols including the hydroxyl unit which terminates a polyalkoxylate moiety which are prevalent in the area of surfactants, inter alia, alkyl ethoxy sulfates.
Abstract:
The invention relates to a method for producing alcohol surfactants and alcohol ether surfactants which are inter alia suitable as surfactants or for producing surfactants. According to the inventive method, olefinic mixtures with a defined minimum content of linear hexene mixtures with a prevailing amount of branched dodecenes are produced which are converted to alcohol surfactants and are then optionally alkoxylated. The alcohol surfactant mixture obtained by the inventive method is characterized by a branching degree of 2.0 to 3.0 and has specifically advantageous properties in terms of its ecotoxicity and biodegradability. The invention further relates to the use of the alcohol surfactants and alcohol ether surfactants as surfactants by glycosidation or polyglycosidation, sulfation or phosphatization.
Abstract:
Polyhydroxy fatty acid amide nonionic surfactants are converted in high yields to their sulfated analog surfactants using an SO3/pyridine complex as a sulfating agent. Thus, C12-C18N-methyl glucamide is sulfated in methylene chloride or pyridine solvent to form the corresponding sulfated glucamide in yields of 80 % or higher.
Abstract:
In a process for producing new anionic tensides with a sulphate structure, reaction products of epoxidized fatty acid glycerin esters with a compound from the group consisting of hydrogen, water, aliphatic alcohols and their ethylene oxide adducts as well as aliphatic carboxylic acids are sulphatized following addition of ethylene oxide, and the sulphuric acid semi-esters formed are neutralized with bases. The products exhibit good surface active properties and can be used in liquid washing and cleaning agents.