摘要:
Supported catalysts which are suitable for ammonoxidation, comprising a) a spherical or approximately spherical support material which essentially comprises aluminum oxide, silicon dioxide, titanium dioxide and/or zirconium dioxide and whose bulk density is from 0.6 to 1.2 kg/l, and b) an active material which comprises, as essential components, vanadium and antimony in oxidic form.
摘要:
A process for the preparation of dicyanobenzenes of the formula ##STR1## in which x denotes hydroxy, C.sub.1 -C.sub.4 alkoxy, nitro, amino, mono- or di-(C.sub.1 -C.sub.4 alkyl)amino, phthalimido or a nitrogenous saturated 5-membered or 6-membered heterocyclic radical, which is attached to the phenyl ring via a nitrogen atomin which a xylene of the formula ##STR2## in which x has the meaning stated above,is oxidized at a temperature of from 400.degree. to 500.degree. C. with oxygen in the presence of ammonia and a catalyst.
摘要:
Polyisocyanates containing isocyanurate groups are prepared by a partial trimerization of (cyclo)aliphatic diisocyanates in the presence of at least one trimerization catalyst selected from the group consisting of tetraalkylammonium alkyl carbonates of the formula (I) ##STR1## (quaternary ammonioalkyl) carbonates having a betaine structure of the formula (II) ##STR2## and the preferred use of the polyisocyanates containing isocyanurate groups which are obtainable in this way is aspolyisocyanate component in polyurethane finishes.
摘要:
Preparation of N-(2-hydroxyethyl)-piperazine by reacting triethanolamine with ammonia in the presence of hydrogen at from 100.degree. to 500.degree. C. and from 10 to 500 bar over a heterogeneous catalyst in which the catalytically active material contains from 20 to 85% by weight of ZrO.sub.2 or Al.sub.2 O.sub.3 or mixtures thereof, from 1 to 30% by weight of at least one copper oxide, calculated as CuO, and from 1 to 60% by weight of at least one oxide of cobalt, nickel or molybdenum, calculated as CoO, NiO and MoO.sub.3, respectively.
摘要翻译:通过使三乙醇胺与氨在100〜500℃的氢气和10〜500巴的存在下,在非均相催化剂上制备N-(2-羟乙基) - 哌嗪,其中催化活性物质含有20〜 85重量%的ZrO 2或Al 2 O 3或其混合物,1至30重量%的以CuO计算的至少一种氧化铜和1至60重量%的至少一种钴,镍或钼的氧化物, 分别计算为CoO,NiO和MoO3。
摘要:
Preparation of vinyl glycols (I) ##STR1## (R.sup.1 to R.sup.6 =H, a carbo-organic radical, optionally substituted) in which an unsaturated diol of formula II ##STR2## is isomerized in the presence of a rhenium catalyst under neutral conditions. The compounds (I) serve as intermediates for the preparation of active substances and for the preparation of polymers.
摘要:
Arylpolyenecarboxylic acids and their derivatives of the formula I ##STR1## where Ar is phenyl, biphenylyl or naphthyl, each of which can be substituted by one to three C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, hydroxyl or phenoxy groups, or amino groups which can be mono- or di-substituted by C.sub.1 -C.sub.4 -alkyl groups, or one methylenedioxy group, it being possible for the substituents to be identical or different,R.sup.1 is hydrogen, an alkali metal or ammonium cation, C.sub.1 -C.sub.20 -alkyl or C.sub.2 -C.sub.20 -alkenyl,R.sup.2 is C.sub.1 -C.sub.8 -alkyl,R.sup.3 to R.sup.7 are each hydrogen or C.sub.1 -C.sub.4 -alkyl, andn is 0 or 1are used as sunscreen agents in cosmetic preparations.
摘要:
Cyclohexenone derivatives of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and A have the meanings stated in the description, herbicides which contain these compounds as active ingredients, and a method for controlling undesirable plant growth.
摘要:
A process for preparing 1,1,3,4,4,6-hexamethyl-1,2,3,4-tetrahydronaphthalene of the formula I ##STR1## comprises reacting p-cymene of the formula II ##STR2## with a hexene of the formula IIIa, IIIb and/or IIIc ##STR3## in the presence of a catalytic amount of aluminum halide and a catalytic amount of a triphenylmethyl compound of the formula IV ##STR4## wherein R.sup.1, R.sup.2 and R.sup.3 are each, independently of one another, hydrogen, C.sub.1 -C.sub.4 -alkyl, nitro or halogen and X is hydrogen or halogen.
摘要:
Dihydroxydiones of the general formulaR--CO--CH(OH)--CH(OH)--CO--R Iwhere R is alkyl, are prepared by a process in which an aldehyde of the general formula ##STR1## where R has the abovementioned meaning, is subjected to electrolysis in a water-containing electrolyte which has a pH of less than 7.
摘要:
Cyclohexane-1,3-dione derivatives of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the meanings given in the disclosure, and the use thereof for combating unwanted plants, especially Gramineae.