Abstract: A polygonal paving stone has a plurality of substantially planar sides extending perpendicularly between parallel upper and lower faces of the stone. A row of substantially identical and outwardly projecting narrow coupling members of a predetermined member width on each of the sides are separated by spaces of a predetermined space width. These narrow members are positioned on the respective sides such that when a plurality of the paving stones are fitted together with their upper faces generally coplanar the narrow coupling members of confronting sides of adjacent paving stones fit between one another A single wide coupling member on each of the sides has a width a greater than that of the member width of the narrow members and smaller than the space width so it can fit between two of the narrow members of a confronting side of an adjacent paving stone.

Abstract: A NMR method to verify the presence of organic molecular compounds consisting of repetitive occurring individual structures is presented. The method comprises the steps of assigning structure codes to the selected compounds, in accordance with the respective starting compounds used, measuring multi-dimensional NMR spectra from at least some of the compounds, uniquely assigning signal groups of NMR spectra to the individual structures, checking the NMR spectra of the compounds for the presence of all assigned signal groups, and characterizing a particular compound as being TRUE if the check of its particular combination of structures yields the result that the signal groups of structures contained in its total code had been observed. The method permits rapid and accurate verification of the presence of compounds having repetitive structures such as those produced in combinatorial chemistry.

Abstract: A NMR method to verify the presence of organic molecular compounds consisting of repetitive occurring individual structures is presented. The method comprises the steps of assigning structure codes to the selected compounds, in accordance with the respective starting compounds used, measuring multi-dimensional NMR spectra from at least some of the compounds, uniquely assigning signal groups of NMR spectra to the individual structures, checking the NMR spectra of the compounds for the presence of all assigned signal groups, and characterizing a particular compound as being TRUE if the check of its particular combination of structures yields the result that the signal groups of structures contained in its total code had been observed. The method permits rapid and accurate verification of the presence of compounds having repetitive structures such as those produced in combinatorial chemistry.

Abstract: A device for mounting and aligning an apparatus on a holding frame, where the apparatus is arranged on a holding part that abuts against the holding frame with a contact surface, and is fastened to the holding frame in a manner allowing rotation about an axis of rotation running perpendicular to the contact surface. A coupling part may be fastened to the holding part on the side of the holding frame facing away from the holding part using fasteners, which reach through at least one opening provided in the holding frame. A fixing device is provided which, during the fastening of the coupling part to the holding part, defines the position of the coupling part relative to the holding part in relation to a predefined alignment. An arrangement is provided for locking the holding part on the holding frame in an adjustable rotational position.

Abstract: The manufacture of substantially pure 4-amino-5-chloro-1-phenylpyridaz-6-one by reaction of 4,5-dichloro-1-phenylpyridaz-6-one with ammonia in the presence of phenol-4-sulfonic acid.