Abstract: In the ruthenium complexes of the general formula A or B, 1

Abstract: Cationic ruthenium complexes of the formula A or B or mixtures containing them, where B may be stabilized by a further ligand L4 and X is an anion which does not coordinate or coordinates weakly to the metal center, Y is a monodentate or multidentate anionic ligand, R and R′ are each, independently of one another, hydrogen or a substituted or unsubstituted C1-C20-alkyl, C6-C20-aryl or C7-C20-alkylaryl radical and L1, L2, L3 and L4 are, independently of one another, uncharged electron donor ligands, are described.

Abstract: Ruthenium complexes of the formula I or IV RuX2(═CH—CH2R)L1L2  (I) RuXY(═CH═CH2R)L1L2  (IV) where X, Y are anionic ligands, R is hydrogen or a substituted or unsubstituted C1-C20-alkyl radical or C6-C20-aryl radical and L1 and L2 are, independently of one another, uncharged electron donor ligands, are prepared by (a) reaction of RuX3 with L1 and L2 in an inert solvent in the presence of a reducing agent and hydrogen and (b) reaction with compounds of the formula II R—C≡CH  (II) where R is as defined above, in the presence or absence of water, and, if desired after isolation of the intermediate, with HY, [HL1]Y or [HL2]Y.

Abstract: A side channel compressor with an impeller with delivery blades that has a seal to prevent leakage between the impeller and the impeller housing. A hub supporting the impeller connects it to a drive shaft. A housing surrounds the impeller, which rotates therein. A sealing device is provided between impeller and housing. The impeller is provided with a bearing ring that overhangs the hub. The overhanging portion of the bearing ring contacts a sealing ring held against a contact surface of the housing by a retaining ring. The retaining ring can be fastened to the housing by screws. The bearing ring can be provided with a corner recess to more securely engage the sealing ring.

Abstract: A method of producing novel polyester yarns, threads or fabrics in which a previously unstretched melt-spun yarn such as polyethylene terephthalate is stretched upon a stationary heated stretching pin of a diameter of 15-60mm. and a pin temperature of 60.degree.-105.degree.C., the yarn being drawn at a stretching ratio of 60-80 percent of the normal ratio while placing the yarn under a thread tension after the pin of 0.2 to 1.1 grams/denier with a ratio of thread tension after the pin to that before the pin of 1:1.5 to 1.4. The resulting novel yarn is characterized by an elongation at breaking point of 30-80 percent, a boiling shrinkage capacity (at 100.degree.C. in water) of 20-50 percent and a large number of random denier fluctuations or variations per unit length of about 15-35 nodules per meter spaced at random intervals of about 0.5 to 8 centimeters. These yarns are particularly useful when fabricated into a textile structure and dyed, e.g.