Abstract:
3-Chloro-3'-nitro-4'-methoxybenzophenone with substantially lower contents of dinitro derivatives than hitherto is obtained if 3-chloro-4'-methoxybenzophenone is nitrated in from 65 to 85% strength by weight sulfuric acid with nitric acid at temperatures in the range from -20.degree. to +60.degree. C.
Abstract:
Isobenzofurandiones are obtained in particularly advantageous manner by the dehydrogenation of tetrahydroisobenzofurandiones in the presence of catalysts at elevated temperature by a process in which distilled tetrahydro-isobenzofurandiones are heated to temperatures of between 120.degree. and 300.degree. C. in the presence of supported palladium and/or platinum catalysts and in the presence of maleic acid derivatives in a trickle-phase or liquid-phase procedure, the temperature in the liquid-phase procedure being increased at a rate of 0.6.degree. to 3.degree. C. per minute above 80.degree. to 110.degree. C.
Abstract translation:通过在催化剂存在下,在升高的温度下,通过四氢异苯并呋喃二酸脱氢的方法,通过在负载的钯和/或碱存在下将蒸馏的四氢异苯并呋喃二酸加热至120-300℃的温度, 或铂催化剂,并且在涓流或液相方法中存在马来酸衍生物时,液相方法中的温度以每分钟高于80℃至110℃的速度增加至110℃ DEG C.
Abstract:
N-arylaminoacrylic acid derivatives are obtained in good yields and in high purities when benzoylacetic acid derivatives are reacted with N-arylimino ethers. The products thus prepared are used, in particular, for the preparation of 4-quinolone-3-carboxylic acid derivatives, which have an outstanding bactericidal action.
Abstract:
Methylene compounds are preferably prepared by reducing an aluminum halide complex of the formula ##STR1## in which R.sup.1 represents a C.sub.6 -C.sub.10 -aryl radical which is optionally substituted by 1 to 4 C.sub.1 -C.sub.4 -alkyl radicals, 1 to 4 fluorine, chlorine and/or bromine atoms, one C.sub.1 -C.sub.8 -alkoxy group and/or one acetoxy group, or represents a heteroaryl radical which is optionally substituted by one C.sub.1 -C.sub.4 -alkyl radical and/or one fluorine, chlorine or bromine atom and contains 5 to 10 C atoms and one O or S atom andR.sup.2 represents a C.sub.1 -C.sub.12 -alkyl radical which is optionally substituted by 1 to 5 fluorine, chlorine and/or bromine atoms, independently of R.sup.1 represents a radical as defined for R.sup.1 and, in the case where R.sup.1 =a C.sub.6 -C.sub.10 -aryl radical which is substituted by 1 to 4 fluorine, chlorine and/or bromine atoms, also represents a furyl or thienyl radical,Y represents fluorine, chlorine or bromine,with an amineborane of the formula ##STR2## in which R.sup.3 represents C.sub.1 -C.sub.4 -alkyl andR.sup.4 represents hydrogen or C.sub.1 -C.sub.4 -alkyl and/orwith sodium borohydride and/or with potassium borohydride.2-(2,4-Dichloro-5-fluorobenzyl)thiophene is obtainable in this way for the first time.
Abstract:
2,2'-Dinitrodiphenyl disulphide is obtained in particularly good yields and purities in a simple manner by reacting 2-chloronitrobenzene with an aqueous alkali metal disulphide solution in the presence of phase transfer catalysts and an organic solvent.
Abstract:
Alkyl-(3-chlorophenyl)-sulphones are particularly advantageously obtained by chlorination of alkylphenylsulphones if alkylphenylsulphones are chlorinated in molten form with elemental chlorine in the presence of iron(III) chloride and optionally iodine and/or sulphur.
Abstract:
In a particularly advantageous process for isolating m-dichlorobenzene from mixtures of dichlorobenzene isomers by crystallization as eutectic crystals using a processing aid, the processing aid used is a compound of the formula (I) ##STR1## in which R.sup.1 to R.sup.6 are, independently of one another, hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl, hydroxyl, NH.sub.2 or R--CO-- having R=C.sub.1 -C.sub.4 -alkyl,with 1-bromo-4-chlorobenzene and 1,4-dibromobenzene being excepted.
Abstract:
Alkylaromatics are subjected to nuclear chlorination in the liquid phase in the presence of Friedel-Crafts catalyst mixtures comprising compounds of iron and antimony and cocatalysts of the formula (II) ##STR1## wherein the substituents have the meaning given in the description.
Abstract:
A process for the preparation of a compound of the formula ##STR1## in which R is hydrogen, alkoxy, alkylamino, dialkylamino or an optionally substituted radical from the group consisting of alkyl, cycloalkyl, aralkyl and aryl,R.sup.1 is an optionally substituted radical from the group consisting of alkyl, alkoxy, alkylthio, mono- or dialkylamino and phenyl,R.sup.2 is optionally substituted alkyl, andY is oxygen or sulphur,comprising(a1) reacting a compound of the formula ##STR2## with ##STR3## or withR.sup.5 COOHin whichR.sup.5 is R except for hydrogen, or equivalent, to produce ##STR4## oxidizing that compound or its salt to ##STR5## and phosphorylating. Several of the intermediates are new.
Abstract:
4-Methyl-2-cyclohexylphenol can be prepared by alkylation of p-cresol with cyclohexanol or cyclohexene by performing the reaction in the liquid phase in the presence of 1-10% by weight, based on the amount of p-cresol, of a large pore, acidic zeolite.