Abstract: Novel substituted hydroxyalkylpyridines of the formula (I), ##STR1## in which x, A and Ar have the meanings given in the description and their acid addition salts and metal salt complexes and their use for combating pests, in particular in the field of plant protection and in the protection of materials.The compounds of the formula (I) may be prepared according to known processes, for example from suitable cyclopropyl ketones and organometallic pyridine compounds.

Abstract: A new process for the preparation of 1-fluorocyclopropyl methyl ketone of the formula ##STR1## which process comprises a) in a first step, reacting 2-acetyl-2-chloro-4-butanolide of the formula ##STR2## with an addition product of triethylamine and hydrogen fluoride of the formula(C.sub.2 H.sub.5).sub.3 N.multidot.n HFin whichn represents the numbers 1, 2 or 3,in the presence of a diluent at a temperature between 20.degree. C. and 120.degree. C. andb) in a second step, reacting the resulting 2-acetyl-2-fluoro-4-butanolide of the formula ##STR3## with a nucleophilic agent in the presence of a diluent at a temperature between 50.degree. C. and 200.degree. C.New halogenoketones of the formula ##STR4## in which Hal represents chlorine or bromine.

Abstract: There are provided new 3-hydroxy-4-aryl-5-oxo-pyrazoline derivatives of the formula (I) ##STR1## The new 3-hydroxy-4-aryl-5-oxo-pyrazoline derivatives of the formula (I) have a particularly pronounced activity against animal pests, in particular against insects and arachnids, and against weeds.

Abstract: Substituted oxazolidinones, some of which are known, of the formula (I) ##STR1## in which R.sup.1 to R.sup.4 have the meanings given in the description, are used for combating pests.The new compounds and those which are known can be prepared by analogous processes by reacting suitable substituted isocyanates with suitable oxiranes or by oxidising suitable oxazolidinones.

Abstract: Process for the preparation of .beta.-fluoroalcohols of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 represent straight-chain or branched alkyl andR.sup.3 and R.sup.4 represent hydrogen or alkyl,in which epoxides of the formula (II) ##STR2## are reacted with sodium hydrogen fluoride or potassium hydrogen fluoride under pressure in the presence of diluents.

Abstract: Solutions of a) a fluorine-containing polyisocyanate in b) an isocyanate-inert solvent are used to impart water, oil and dirt resistance to porous inorganic substrates impregnated therewith. The fluorine-containing polyisocyanate is preferably selected from fluorine-containing polyisocyanates having a fluorine content in the form of perfluorinated alkyl groups of from about 15 to about 60% by weight and an isocyanate content of from about 0.5 to about 15% by weight. These isocyanates are obtained by reaction of (cyclo)aliphatic isocyanates with fluorine-containing mono- and polyhydric alcohols, and selected fluorine-containing alcohols suitable for the production of these polyisocyanates.

Abstract: The present invention relates to a multi-step process for the preparation of 1,1-difluoroalkanesulphenyl chlorides of the general formula (I):R--CH.sub.2 --CF.sub.2 --S--ClThe process comprises the following steps:(1) R.sup.1 --SH+R--CH.dbd.CF.sub.2 .fwdarw.R.sup.1 --S--CF.sub.2 --CH.sub.2 --R(2) R.sup.1 --S--CF.sub.2 --CH.sub.2 --R+chlorine agent.fwdarw.Cl--S--CF.sub.2 --CH.sub.2 --RStep (1) is carried out in a base at 0.degree. C.-250.degree. C., optionally in the presence of a solvent and/or a phase transfer catalyst. Step (2) is carried out at -78.degree. C.-100.degree. C., optionally in a solvent and optionally after the product of step (1) has been isolated. The final products are intermediates for organic syntheses.