Abstract: The invention relates to a process for the preparation of polyurethane or polyurethane-polyurea molded parts by reacting organic polyisocyanates, polyols and chain extenders in the presence of monocyclic amidines having the formula ##STR1## as catalyst or catalyst mixtures of monocyclic amidines having the formula (I) and (a) tertiary amines, (b) metal salts having the formula Me X.sub.n Y.sub.m (II), and/or (c) optionally-substituted aliphatic carboxylic acids. R.sup.1 and R.sup.2, Me, X, Y, n, and m are defined herein.

Abstract: Quinol-4-ylmethane derivatives of the formula I ##STR1## where R.sup.1 is hydrogen or chlorine, R.sup.2 is trifluoromethyl or chlorine, R.sup.3 is a nitrogen-containing, cyclic-unsaturated or acyclic-saturated radical of not more than 6 carbon atoms, R.sup.4 is hydrogen or an anion-stabilizing group and R.sup.5 is hydrogen, an anion center or an acetal radical of not more than 8 carbon atoms, their preparation and their use for the preparation of quinol-4-ylmethane derivatives.

Abstract: The present invention relates to a simplified process, which avoids organo-lithium intermediates, for the preparation of erythro-.alpha.-piperid-2-yl-2,8-bis-(trifluoromethyl)-quinolin-4-yl-metha nol, wherein 2,8-bis-(trifluoromethyl)-quinoline-4-carboxylic acid or a salt thereof is reacted with a pyrid-2-yl-magnesium halide to give pyrid-2-yl-2,8-bis-(trifluoromethyl)-quinolin-4-yl ketone in the manner of a Grignard reaction, and this product is hydrogenated, in a conventional manner, to give erythro-.alpha.-piperid-2-yl-2,8-bis-(trifluoromethyl)-quinolin-4-yl-metha nol.

Abstract: O,N-Disubstituted hydroxylamines are prepared by reacting O-substituted ketoximes with hydrogen in the presence of a platinum catalyst at from 35 to 50 bar, in a medium containing a mineral acid.The O,N-disubstituted hydroxylamines I obtained by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and drugs.

Abstract: Process for the manufacture of .alpha.-naphthol by hydrolyzing .alpha.-naphthyl esters of aliphatic carboxylic acids in a distillation column by means of steam in counter-current at a particular temperature, and in a certain ratio, in the presence of naphtholsulfonic acids and/or sulfonic acids of naphthyl esters. The .alpha.-naphthol obtainable by the process of the invention is a valuable starting material for the manufacture of dyes, drugs and insecticides, e.g. .alpha.-naphthyl N-methylcarbamate.

Abstract: The invention relates to special acetals of benzoin compounds which act as photoinitiators, and to a technically simple manufacturing process involving the reaction of an appropriate .alpha.- or .beta.-hydroxyketone with an .alpha.,.beta.-olefinically unsaturated ether in the presence of an acid catalyst. The acetals are particularly suitable for use as photoinitiators in the preparation of photopolymer printing plates.

Abstract: Compositions polymerizable by ultraviolet irradiation which contain photopolymerizable monomers possessing at least one polymerizable carbon-carbon multiple bond and monoketals of the formula ##STR1## as photoinitiators. The compositions have a particularly long shelf life and show very little yellowing after curing by irradiation.