摘要:
O,N-Disubstituted hydroxylamines are prepared by reacting O-substituted ketoximes with hydrogen in the presence of a platinum catalyst at from 35 to 50 bar, in a medium containing a mineral acid.The O,N-disubstituted hydroxylamines I obtained by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and drugs.
摘要:
A process for removing impurities from 3-(2′-acetoxyethyl)dihydro-2(3H)furanone (I), where the 3-(2′-acetoxyethyl)dihydro-2(3H)furanone containing the undesirable impurities is initially prepared in a manner known per se by acetylation of 3-(2′-hydroxyethyl)dihydro-2(3H)furanone and the resulting product is subsequently subjected to a distillation or rectification, includes carrying out the distillation or rectification in a plurality of steps, where high-boiling impurities are removed in a first step, the product which is drawn off via the top is subsequently subjected to at least one further step in which low-boilers and intermediate boilers are drawn off via the top and the desired pure I is obtained as bottom product.
摘要:
Aniline derivatives of the formula ##STR1## where R.sup.1, Y, A, Z and n have the meanings given in the description, are used for controlling undesirable plant growth.
摘要:
Alkyl anthranilates are prepared by reacting an isatin with an alkanol and hydrogen peroxide in the presence of an alkali metal alkanolate.The alkyl anthranilates obtainable by the process of the invention are valuable starting materials for the preparation of pesticides, dyes and drugs.
摘要:
.alpha.,.beta.-Unsaturated ketones of the general formula I ##STR1## where R is an organic radical, are prepared by reacting a corresponding aldehyde R--CHO with acetoacetic acid or one of its salts in the presence of an amine in a two-phase reaction mixture by a process in which the reaction is carried out at a pH of from 6 to 8 in the presence of a catalytic amount of a primary amine.
摘要:
A batchwise or continuous process for separating water from a mixture of water and 1-methoxy-2-propanol by passing a heated mixture in liquid or gaseous form over a hydrophilic membrane which is selective to the passage of water.
摘要:
O-(1-Methoxy-2-chloro)ethoxyphenyl N-methylcarbamate is prepared by reacting pyrocatechol carbonate with methylamine and then reacting the resulting pyrocatechol monomethylcarbamate with 1,2-dichloroethyl methyl ether in the presence of a secondary amine.
摘要:
A process for the preparation of isatoic anhydrides of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is hydrogen, alkyl, alkoxy, halogen, nitro, haloalkyl or haloalkoxy, by reacting an isatin of the formula ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the stated meanings, with hydrogen peroxide in an acid medium.
摘要:
A process for the preparation of &agr;-chloromethylene-triorganylphosphorane derivatives I (radicals R are C-organic substituents and A stands for CN or CO-B where B is a C-organic or O-organic radical which is inert under chlorination conditions) by chlorination of phosphoranes II with chlorine, wherein the chlorination is carried out in the presence of a mineral base as hydrogen chloride acceptor and the chlorine and base are fed to the reaction mixture concurrently but separately at the rates at which they are consumed. The reaction products I are important intermediates for plant protectants.
摘要翻译:制备α-氯亚甲基 - 三有机基磷烷衍生物I(自由基R是<有机取代基)的方法,A代表 CN SMALLCAPS>或 CO SMALLCAPS> - B,其中B是在氯化条件下为惰性的 SMALLCAPS> - 有机或 O SMALLCAPS> - 有机基团),其中氯化在存在下进行, 的矿物碱作为氯化氢受体,氯和碱同时进料到反应混合物中,但分别以它们被消耗的速率进料。反应产物I是植物保护剂的重要中间体。
摘要:
Pyridazinone derivatives of the formula ##STR1## where R.sup.1 is alkyl, alkenyl, cycloalkyl or unsubstituted or substituted phenyl, R.sup.2 is chlorine or bromine, R.sup.3 is hydrogen, alkyl, cycloalkyl or unsubstituted or substituted phenyl and X is SO or SO.sub.2, with the proviso that R.sup.1 is not methyl when X is SO.sub.2, R.sup.2 is chlorine and R.sup.3 is phenyl, and fungicides containing these compounds.