摘要:
Novel process for the preparation of an arylglyoxylic acid compound, e.g., phenylglyoxylic acid, which comprises oxidizing an .alpha.-hydroxyarylacetic acid, e.g., mandelic acid, of the formula ##STR1## in which m is 1, 2 or 3,each R individually is hydrogen, alkyl, cycloalkyl,aryl, aralkyl, alkoxy, cycloakoxy, aryloxy, hydroxyl,halogen, aminoalkyl or carboxyl,with the proviso thattwo R's together can represent the methylenedioxygroup or a fused-on, optionally heterocyclic andoptionally substituted ring,with oxygen or a gas containing molecular oxygen in aqueous alkaline medium in the presence of a catalyst comprising a platinum-group metal in the presence as an activator of at least one of lead, a lead compound, bismuth and a bismuth compound at a temperature of up to the boiling point of the resulting reaction mixture.
摘要:
Phenols, meta-substituted by halogen are prepared by reacting halogenophenols of the formula ##STR1## wherein X.sup.1 and X.sup.2 are identical or different and represent halogen, hydrogen or optionally substituted aryl or aralkyl, with at least one of the radicals X.sup.1 orX.sup.2 representing halogen, andR.sup.1, r.sup.2 and R.sup.3 are identical or different and represent hydrogen or optionally monosubstituted or polysubstituted aryl or aralkyl or chlorine, bromine or iodine, with at least one of the radicals R.sup.1, R.sup.2 and R.sup.3 representing chlorine, bromine or iodine,With hydrogen under pressure at elevated temperature in the presence of elemental sulfur, or compounds thereof optionally in the presence of active charcoal and/or iron salts.
摘要:
1,2-Dichlorobenzene can be prepared by reacting 1,2,4-trichlorobenzene in the gas phase with hydrogen. The reaction is carried out at a temperature from the boiling point of the starting material up to about 400.degree. C. and over a platinum-spinel catalyst.
摘要:
The present invention relates to the preparation of thiocyanatomethylthiobenzothiazoles by the reaction of halomethylthiobenzothiazoles with thiocyanates at elevated temperature in aqueous solution in the presence of a phase transfer catalyst.
摘要:
Thermotropic aromatic polyesters which contain 3,3'-diphenyl-4,4'-dihydroxydiphenyl radicals as diphenol radicals can be processed by thermoplastic methods without decomposition, in spite of the high heat distortion resistance.
摘要:
The invention relates to a process for the preparation of anilines which are m-substituted by chlorine, by selective dehalogenation of more highly chlorinated anilines in an acid medium in the presence of noble metal catalysts and in the presence of optionally substituted phenols.The 3-chloro- or 3,5-dichloroanilines obtainable by the process according to the invention are known intermediate products, and can be used for the preparation of plant protection agents.
摘要:
A process for the preparation of a 4-aminodiphenyl amino derivative which comprises:(a) contacting a hydroxybenzene of the formula ##STR1## wherein R is hydroxyl or amino with an aniline compound of the formula ##STR2## wherein R.sub.1 represents hydrogen or an alkyl radical in the presence of a .gamma.-aluminum oxide containing catalyst; and(b) contacting the product from step (a) with ammonia in the presence of the same .gamma.-aluminum oxide containing catalyst used in step (a).
摘要:
1,1-Dimethyl-indan-4-yl N-alkyl-carbamic acid esters of the formula ##STR1## in which R.sup.1 is alkyl, andR.sup.2 and R.sup.3 each independently is hydrogen or alkyl, which possess fungicidal and arthropod development-inhibiting properties.
摘要:
Process for the preparation of an arylglyoxylic acid of the formula Ar--CO--COOH, wherein Ar is optionally substituted aryl, which process comprises oxidizing the corresponding arylethane-1,2-diol of the formula ##STR1## with oxygen or a gas containing molecular oxygen, in an aqueous alkaline medium and in the presence of a platinum-group metal catalyst and, as an activator, a material selected from lead, lead compounds, bismuth and bismuth compounds, at a temperature of up to the boiling point of the reaction mixture; e.g. phenylglyoxylic acid is produced from phenylethane-1,2-glycol preferably using platinum activated with lead, bismuth, or compounds thereof.
摘要:
Indan-5-yl-N-methylcarbamic acid esters of the formula ##STR1## in which R represents hydrogen or C.sub.1 -C.sub.4 alkyl,R.sup.1 represents hydrogen or C.sub.1 -C.sub.4 alkyl,R.sup.2 represents C.sub.1 -C.sub.4 alkyl,R.sup.3 represents hydrogen or C.sub.1 -C.sub.4 alkyl andR.sup.4 represents hydrogen, chlorine, bromine, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy,Which possess arthropodicidal and fungicidal properties.