摘要:
Cyclic 6-membered to 8-membered 1,2-vinylenedioxy compounds of the general formula I ##STR1## where A is ##STR2## R.sup.1 to R.sup.7 independently of one another are each hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.2 -C.sub.16 -alkoxyalkyl, C.sub.2 -C.sub.8 -alkenyl, C.sub.2 -C.sub.8 -alkynyl, C.sub.5 -C.sub.8 -cycloalkyl, aryl, C.sub.7 -C.sub.10 -alkylphenyl, C.sub.7 -C.sub.10 -phenalkyl, C.sub.8 -C.sub.10 -phenalkenyl or a heterocyclic structure, or R.sup.2 and R.sup.3, R.sup.2 and R.sup.4, R.sup.3 and R.sup.4, R.sup.2 and R.sup.6, R.sup.3 and R.sup.6, R.sup.4 and R.sup.5 or R.sup.6 and R.sup.7 together form a cycloaliphatic or heterocyclic ring, and R.sup.1 to R.sup.7 may furthermore carry substituents which are inert under the reaction conditions, and n is 0 or 1, are prepared by a process in which a cyclic 2-oxymethyl-1,3-dioxa compound or one of its derivatives of the general formula II ##STR3## where R.sup.1 to R.sup.7, A and n have the abovementioned meanings, and R.sup.8 is hydrogen or C.sub.1 -C.sub.12 -alkyl, is converted in the presence of an acidic catalyst at from 150.degree. to 450.degree. C. and under from 0.001 to 50 bar, some of the compounds obtained being novel.
摘要:
Tertiary phosphine oxides, phosphine sulfides and/or phosphine dihalides are reduced to tertiary phosphines by reaction with a hydrocarbon in the presence of carbon at elevated temperatures.
摘要:
2-Alkyl-4,5-dihydroxymethyl-imidazoles of the formula ##STR1## where R is alkyl, are prepared by a process in which an imidazole of the formula ##STR2## is reacted with not less than 2 moles of formaldehyde in the presence of a base.
摘要:
Quinoline and substituted quinolines are prepared by reacting aniline or a substituted aniline with an .alpha., .beta.-monounsaturated aldehyde in a high-boiling mineral oil by a method in which the high-boiling mineral oil is replaced when it becomes enriched with by-products, and the said mineral oil enriched with by-products is removed.
摘要:
Substituted benzylimidazolium salts of the formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are identical or different and are each hydrogen, C.sub.1 -C.sub.4 -alkyl or halogen, R.sup.4 is alkyl of 8 to 14 carbon atoms or benzyl which is unsubstituted or substituted by halogen or alkyl, R.sup.5 is hydrogen, alkyl of 1 to 8 carbon atoms, phenyl or benzyl, R.sup.6 is alkyl of 1 to 4 carbon atoms or halogen, R.sup.7 is alkyl of 1 to 4 carbon atoms or halogen and X is an anion of an acid, in particular of a hydrohalic acid, and microbicides containing these compounds.
摘要:
Carbamates are manufactured by reaction of alcohols with urea in the presence of ion exchangers containing nickel.The products are starting materials for the manufacture of textile finishing agents, dyes and plant protection agents.
摘要:
Production of N-alkylated cyclic alkylenimines by reaction of cyclic alkylenimines with an alcohol or ether in the gas phase in the presence of a high-area SiO.sub.2 /P.sub.2 O.sub.5 catalyst.
摘要:
Aziridinocarboxylic acid esters of polyols are manufactured by trans-esterification of the corresponding esters of lower alcohols, using magnesium oxide or calcium oxide as the trans-esterification catalyst; this method gives a higher yield and a purer product.
摘要:
A process for preparing bisphenol alkoxylates comprises reacting at least one bisphenol with alkylene oxide in the presence of a phosphine catalyst which is essentially free of alkali metal hydroxide.
摘要:
A process for the continuous production of 1,3-dioxolan-2-ones such as ethylene carbonate or propylene carbonate by reacting a corresponding oxirane with carbon dioxide in the liquid phase in the presence of a catalyst comprises conducting the reaction in a two-part reactor in whose first part the reaction is taken with backmixing to a conversion of not less than 80% of the oxirane II and in whose second part the reaction is completed under nonbackmixing conditions, and passing the carbon dioxide in countercurrent to the oxirane II in the entire reactor.