摘要:
4-Hydroxydiphenyl (mono-OD) and 4,4'-dihydroxydiphenyl (DOD) are obtained simultaneously from a mixture which contains these two substances, if such a mixture is treated with an aqueous alkali, and the resulting solution and the solid phase formed are separated at a temperature from -28.degree. C. to +40.degree. C. and the solution and the solid phase are acidified separately in order to form the free mono-OD and DOD. Mono-OD and DOD can be present in the starting mixture in the free form or in the form of the alkali metal phenolates. After formation of the alkali metal phenolates, where this is required, the aqueous alkali still contains 1-15 mol of alkali metal hydroxide per mol of the diphenyl compounds. The concentration of alkali metal hydroxide should be 4-25% by weight, relative to the amount of water present. In this process, it is also possible to employ industrial mixtures of the alkali melts of the associated diphenyl-sulphonic acids.
摘要:
Improved process for the preparation of nitronaphthalene-sulphonic acids by reacting the corresponding naphthalene-sulphonic acids with nitric acid and working up the nitration mixture, characterized by the features that the reaction of the naphthalene-sulphonic acids with nitric acid is already interrupted before the nitration reaction has ended and that the nitration mixture is treated, optionally after dilution with water, with bases at a pH value of 5 to 14.
摘要:
A process for the preparation of neopentylamine which is virtually free from amines with a higher degree of alkylation which comprises contacting neopentanol with ammonia at a temperature of 200.degree. to 300.degree. C. in the presence of a hydrogenation catalyst. The process can be carried out under increased pressure and in the presence of catalytic amounts of hydrogen.
摘要:
The process for preparing 1-amino-2-naphthol-4-sulphonic acid by acidifying 3-oxo-4-hydroxyimino-1,2,3,4-tetrahydronaphthalene-1-sulphonic acid or its alkali metal salt in the presence of hydrogen sulphite is carried out in the presence of iron ions.
摘要:
The herbicidal 3,6-substituted 4-amino-1,2,4-triazin-5-one of the general formula ##STR1## wherein R.sup.1 and R.sup.2 have the meaning given in the description,is obtained in good yields by a new two-stage cyclization reaction if an .alpha.-ketocarboxylic acid amide of the general formulaR.sup.1 --CO--CO--NHR.sup.3 (II)is reacted with a hydrazidine of the general formula ##STR2## if appropriate in the presence of a diluent at temperatures between 0.degree. and 150.degree. C., whereby in the first process stage a condensation reaction takes place to give condensation products which still have open chains, and in the second process stage an elimination reaction with ring closure takes place to give the end product of formula (I).
摘要:
Process for the preparation of a bis-(amino-phenyl)-disulphide of the formula ##STR1## in which R represents hydrogen or halogen,which comprises contacting an amino-thiophenol of the formula ##STR2## or a salt thereof in which R has the abovementioned meaningwith sulphur or a sulphur-donating substance in an aqueous dispersion at a temperature of 10.degree. to 120.degree. C. and a pH value of 3 to 9.
摘要:
In a process for the preparation of an aromatic chloroformic acid ester by contacting a phenol and phosgene, the improvement wherein the reaction is carried out in a homogeneous liquid phase at a temperature of 60.degree. to 180.degree. C. in the presence of organic phosphorus compound of the formulaR.sup.1 R.sup.2 R.sup.3 PR.sup.4.sub.n X.sub.nin whichR.sup.1, R.sup.2 and R.sup.3 independently of one another represent hydrogen, alkyl, alkenyl, aralkyl, aryl or halogen and two of the said radicals together with the phosphorus atom can form a 5-membered or 6-membered phosphorus-containing saturated or unsaturated heterocyclic radical,X represents OH, homopolar-bonded halogen or an inorganic or organic acid anion,R.sup.4 denotes hydrogen or alkyl or, if X denotes halogen, can also denote halogen and n denotes 0 or 1,and in which, furthermore,R.sup.4 and X together can represent oxygen or sulfur.
摘要翻译:在通过使苯酚和光气接触来制备芳族氯甲酸酯的方法中,其中反应在有机磷化合物存在下在60-180℃的温度下在均相液相中进行 其中R 1,R 2和R 3彼此独立地表示氢,烷基,烯基,芳烷基,芳基或卤素,并且所述基团中的两个与磷原子一起形成式R 1 R 2 R 3 PR 4 n X n可以形成5元或6元磷 - 含有饱和或不饱和杂环基,X表示OH,单键键合的卤素或无机或有机酸阴离子,R4表示氢或烷基,或者如果X表示卤素,也可以表示卤素,n表示0或1, 此外,R4和X可以一起代表氧或硫。
摘要:
An improvement in a process for the preparation of a sulphonic acid chloride of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are independently hydrogen, a lower alkyl radical or a cycloalkyl radical, halogen, aryl, aralkyl, aryl ether or a radical --SO.sub.2 Cl, --SO.sub.2 -aryl ##STR2## or wherein adjacent radicals R.sup.1 and R.sup.2 are linked to form a cycloaliphatic, aromatic or hetero-aromatic ring which is optionally substituted by a sulphonic acid chloride group wherein an aromatic compound of the formula ##STR3## wherein R.sup.1, R.sup.2 and R.sup.3 have the above-identified meanings is reacted initially with chlorosulphonic acid and thereafter the reaction product is reacted with phosgene in the presence of a catalyst.
摘要:
An improvement in the process for preparing benzenesulphonic acid chloride by reacting benzenesulphonic acid with thionyl chloride, the improvement residing in carrying out the process in the presence of a sulphonating agent.
摘要:
Aminomethylene compounds of the formula ##STR1## can be prepared by reaction of C-H acid compounds of the formula ##STR2## with salts of the formula ##STR3## in the presence of alkoxides of the formulaM.sup.1 OR.sup.10 (IV)where the radicals R.sup.1 to R.sup.4, R.sup.7, R.sup.10, X.sup.- and M.sup.1 have the meaning mentioned in the description.