Abstract: Alkylbenzenes of the general formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.4 -alkyl, preferably methyl, and R.sup.2 is hydrogen or C.sub.1 -C.sub.4 -alkyl, preferably methyl, are prepared by catalytic aromatization of the corresponding alkenylcyclohexenes of the general formula II ##STR2## by carrying out the conversion in the gas phase at 150.degree.-400.degree. C. over a catalyst which contains palladium oxide and sulfur and/or selenium or selenium oxide on active carbon.

Abstract: A positioning apparatus has a guidance system including first and second bearing means in which a pressure on one side of a guide plate and a height adjustment on its other side to be positioned are sufficient to provide an unambiguous controlled guidance virtually without deviation from the axis of movement of the guide plate. An advantageous construction is provided by a rotary bearing arrangement substantially in the form of an isosceles triangle. A particular mounting pivot point on the bearing support simplifies the assembly of an apparatus having a band drive means. The apparatus is suitable for all types of information recording and playback apparatuses employing disks or disk-shaped media, and also for positioning purposes in robots, etc.

Abstract: The novel colorants of the formula (I) ##STR1## where the rings A, B and C independently of one another are unsubstituted or substituted by groups which impart insolubility, possess high color strength, very good fastness to migration and excellent lightfastness and weatherfastness and are therefore very useful for pigmenting plastics and surface coatings.

Abstract: Acylphosphine compounds of the formula I ##STR1## where X is oxygen, sulfur or an electron pair, R.sup.1 is R.sub.4 or OR.sup.4, R.sup.2 is --OM, where M is a monovalent cation, R.sup.3 is aryl which is substituted at least at the two positions ortho to the carbonyl group, and R.sup.4 is hydrogen, alkyl or aryl, are very effective photoinitiators for photopolymerizable materials, such as coating compositions, finishes, printing inks, unsaturated polyesters, recording media and preferably aqueous polymer dispersions or solutions.

Abstract: 6-(3-Thienylmethylamino)-purine of the formula ##STR1## a process for its manufacture, and agents for regulating plant growth containing a compound of the formula I.

Abstract: Imidazoles are prepared by subjecting an .alpha.,.beta.-dicarbonyl compound to a Radziszewski reaction with an aldehyde and ammonia and then catalytically hydrogenating the product.Imidazole and its derivatives are useful intermediates for drugs, crop protection agents and dyes.

Abstract: The novel recording materials contain triquinocyclopropanes of the formula (I) ##STR1## where R.sup.1, R.sup.2 and R.sup.3 independently of one another are each C.sub.1 -C.sub.12 -alkyl, in a polymer layer, and can be written on and read by means of a semiconductor laser. The information written has a high signal-to-noise ratio.

Abstract: The invention relates to an improved process for the preparation of toluene diamine from dinitrotoluene involving hydrogenation of dinitrotoluene with hydrogen gas at elevated temperatures and super atmospheric pressure in the presence of a supported nickel catalyst and carbon monoxide ranging from 0.001 to 0.1 volume percent. The rate of hydrogenation, product quality and yield are improved when hydrogen spiked with small amounts of carbon monoxide was used.

Abstract: 3,7-Dichloroquinoline derivatives which are substituted in the 8-position by --CH.dbd.CHR or --CH.dbd.NR.sup.5, and their use for controlling undesirable plant growth.

Abstract: Mixtures of dye precursors which contain (a) the lactone of 2-carboxy-4,4'-bisdimethylaminobenzhydrol (I) and (b) crystal violet lactone and/or one or more fluoran lactones of the formula ##STR1## where R.sup.1 is alkyl, R.sup.2 is alkyl, phenalkyl, unsubstituted or substituted phenyl or cycloalkyl, or ##STR2## is pyrrolidinyl, piperidinyl or morpholinyl, R.sup.3 is H or tert.-butyl, R.sup.4 is H or methyl, R.sup.5 is H, alkyl or phenalkyl and R.sup.6 is H, alkyl, phenalkyl, cycloalkyl or unsubstituted or substituted phenyl, or ##STR3## is pyrrolidinyl, piperidinyl or morpholinyl, possess improved lightfastness in pressure-sensitive recording systems.

Abstract: A transparent window member for a tape cassette, which together with a reel pressure spring, forms a subassembly of the cassette. The reel pressure spring has a U-shaped central portion, the bight of the U being parallel to the plane of the spring arms, and the reel pressure spring having a longitudinal edge with two transverse slits spaced the same as the legs of the U of the central portion of the pressure spring. The central portion may thus be transversely inserted in the longitudinal edge of the window member and it thus forms a locating element for the pressure spring.

Abstract: Quinoline derivatives of the formula ##STR1## where X, n, R.sup.1, R.sup.2 and Y have the meanings given in the description, are used for controlling undesirable plant growth.

Abstract: Accelerated fixing of chromate-containing wood preservative salts, in which freshly impregnated timbers are subjected to fixing with superheated steam, is carried out by a process wherein the freshly impregnated timbers are subjected beforehand to a heat treatment in which both the wood surface and the internal walls of the heating chamber are heated to 60.degree.-100.degree. C., preferably 80.degree.-95.degree. C., and the timbers are then treated with superheated steam in a conventional manner.

Abstract: .alpha.-(o-Chlorophenyl)-aminomethylene-.beta.-formylaminopropionitrile, process for its preparation by reacting a metal salt of .alpha.-formyl-.beta.-formylaminopropionitrile with a salt of o-chloroaniline in an aqueous medium, and use of the product to prepare the compound of the formula ##STR1## by reaction with acetamidine. The pyrimidine thus obtained is an intermediate for the preparation of vitamin B.sub.1.

Abstract: A conductive fiber is made by an electroless plating process which is used in conjunction with a wet spinning process. The polymer must be catalyzed before the wet gel is collapsed. The resulting filament has a conductive region which is at least partially coincident with the polymer structure.

Abstract: Oligomeric resins are crosslinkable by polymerization, soluble or dispersible in aqueous alkaline solutions, preferably contain more than 2 (meth)acryloyl groups and free carboxyl groups and are prepared by a special process. Photosensitive, photopolymerizable and crosslinkable recording materials for optical information fixing are based on these oligomeric resins, and lithographic printing plates are produced by a process in which the novel photosensitive recording materials are used.

Abstract: An improved multifilamentary tow of carbon fibers is provided which possesses a novel physical configuration that better enables it to undergo impregnation with a matrix-forming resin to form quality composite articles. The individual filaments of the tow are randomly decollimated and commingled with numerous filament cross-over points throughout the length of the multifilamentary tow in order to create a multitude of interstices between adjacent filaments which are well adapted to receive and retain a matrix-forming resin as evidenced by the ability of the filaments when subjected to the flaring test described herein to resist lateral expansion to a width that is as much as three times the original width. The tow commonly comprises approximately 1,000 to 50,000 filaments. Also, the filaments of the tow are substantially continuous and contain at least 70 percent carbon by weight (preferably at least 90 percent carbon by weight).

Abstract: Vinylphenol derivatives of the formula I ##STR1## where A and R.sup.1 to R.sup.7 have the meanings stated in claim 1 and in the description, and their physiologically tolerated salts, drugs prepared from these, and their use for the treatment of various disorders of the skin, the mucous membranes and the internal organs, and of rheumatic disorders.

Abstract: Nylon moldings which may or may not be cellular and have improved performance characteristics are obtained by activated alkaline polymerization of caprolactam in the presence of an amorphous or partially crystalline polycondensate which has a solubility of not less than 5% by weight in caprolactam at 120.degree. C.

Abstract: A process for the preparation of aliphatic, cycloaliphatic, arylaliphatic and aliphatic-cycloaliphatic di- and polyurethanes wherein primary aliphatic, cycloaliphatic, arylaliphatic or aliphatic-cycloaliphatic di- or polyamines are reacted with urea and a primary or secondary aliphatic alcohol at temperatures of above 190.degree. C. to 300.degree. C., following which ammonia and other by-products are separated from the aliphatic, cycloaliphatic, arylaliphatic or aliphatic-cycloaliphatic di- or polyurethane product.