Abstract: 5-Aryloxy-5-azolyl-3,3-dimethylpent-1-en-4-ones and -ols of the formula ##STR1## in which Ar is an optionally substituted aryl group,Az is a 1,2,4-triazol-1-yl, 1,2,4-triazol-4-yl or imidazol-1-yl group, andB is a keto group of a CH(OH) grouping,or addition products thereof with physiologically acceptable acids or metal salts are suitable for use as plant protection agents, and can be employed with particularly good success for combating those fungi which cause powdery mildew diseases, thus for combating Erysiphe species, Sphaerotheca species and Podosphaera species, and for combating diseases of rice.

Abstract: Perchloroethylene, phosgene, and silicon tetrachloride are coproduced by passing vaporous carbon tetrachloride into contact with porous silica at a temperature of 800.degree. to 950.degree. C. The silica is disposed as a bed of granules have a surface area of from 0.1 to 30 m.sup.2 /g. It should be at least 90 percent pure and free of elemental carbon. Molecular oxygen and water vapor are excluded. The carbon tetrachloride is supplied in a proportion more than two mols per mol of silica consumed.

Abstract: A reagent comprising the product of the reaction of an alkali metal hydroxide with a polyglycol or a polyglycol monoalkyl ether and oxygen, effects complete decomposition of halogenated organic compounds, such as polychlorinated biphenyls (PCBs), when mixed therewith in the presence of oxygen.

Abstract: Monohalogenated olefins are prepared from halo-alkanes containing 2 to 6 carbon atoms and at least two hydrogen atoms on adjacent carbons by dehydrogenation of the halo-alkanes at a temperature from about 400.degree. to about 700.degree. C. in the presence of oxygen and in contact with a catalyst comprising a halide of copper and an alkali metal phosphate, particularly potassium phosphate, deposited upon an inorganic support. Typically, vinyl chloride is prepared from ethyl chloride.

Abstract: A process is described for the preparation of cis-pent-2-enyl-1-chloride according to the reaction: ##STR1##

Abstract: There is disclosed a process for the production of hexachlorocyclopentadiene comprising the steps of:1. Reacting liquid cyclopentadiene and chlorine at a temperature of from about 0.degree. to about 100.degree. C. until an average of at least 4 chlorine atoms has been added per mole of cyclopentadiene to form a first-stage product;2. heating the resultant liquid reaction product of Step 1 in a second stage at a temperature of from about 140.degree. C. to below about 200.degree. C. with chlorine in the presence of from about 0.0001% to about 5.0% (by weight) of an aromatic compound until the reaction products of Step 1 contain an average of about 6 chlorine atoms per molecule, based on cyclopentadiene starting material; wherein said aromatic compound contains from 1 to 3 aromatic rings; at least one of the rings containing a nitrogen atom;3. vaporizing and heating the resulting reaction products of Step 2 in a third stage in the presence of chlorine to a temperature of above 450.degree. C.

Abstract: Hexachlorocyclopentadiene is produced by the use of a molten salt mixture of cuprous and cupric chloride, with the reaction effluent including the product, chlorine, hydrogen chloride, unreacted feed and organic byproduct, as well as entrained molten salt. The effluent is cooled at a temperature and pressure to effect condensation of organics, with the salt being present in the condensate. The salt is then separated from the organics for re-use in the process. Hydrogen chloride and chlorine present in the effluent are also recovered for re-use in the process.