The crystal structure of cannabidiol, C21H30O2, {systematic name: 2-[(1R,6R)-3-methyl-6-(prop-1-en-2-yl)cyclohex-2-enyl]-5-pentylbenzene-1,3-diol}, was determined earlier by Joneset al.[(1977).Acta Cryst.B33, 3211–3214] and Ottersen & Rosenqvist [(1977).Acta Chem. Scand.B31, 749–755]. In both investigations, the absolute configuration is given asR,R, referring to Mechoulamet al.[(1967.J. Am. Chem. Soc.89, 4552–4554]. In the latter, the absolute configuration was identified by chemical means. Using the advantages of modern single-crystal X-ray diffractometers such as area detectors and high-intensity radiation sources, a high-quality structure determination including the absolute configuration was possible and is shown in this work. Furthermore, the rather uncommon CuKβ wavelength radiation was applied for the structure determination, which confirmed the absolute structure to beR,R.
Abstract. The reaction of Cs 3 As 7 with diphenylacetylene in the presence of [18]crown-6 in liquid ammonia results in the formation of the new compound [Cs([18]crown-6)] 2 As 7 C 14 H 11 ·6NH 3 , which crystallizes in black monoclinic crystals. It contains the first monosubstituated heptaarsenide anion with a hydrocarbon-only substituent and theoretical calculations show a significant influence of the organic substituent on the electronic structure within the cage. The (Z)-1,2-diphen-
The title compound, [Pd(NH3)4]Cl2·4NH3, was crystallized in liquid ammonia from the salt Pd(en)Cl2 (en is ethylenediamine) and is isotypic with [Pt(NH3)4]Cl2·4NH3 [Grassl & Korber (2014 ▶). Acta Cryst. E70, i31]. The Pd2+ cation is coordinated by four ammonia molecules, exhibiting a square-planar geometry. The chloride anions are surrounded by nine ammonia molecules. These are either bound in the palladium complex or solvent molecules. The packing of the ammonia solvent molecules enables the formation of an extended network of N—H⋯N and N—H⋯Cl interactions with nearly ideal hydrogen-bonding geometry.
The title compound, C2H2·C12H24O6·2NH3, was formed by co-crystallization of 18-crown-6 and acetylene in liquid ammonia. The 18-crown-6 molecule has threefold rotoinversion symmetry. The acteylene molecule lies on the threefold axis and the whole molecule is generated by an inversion center. The two ammonia molecules are also located on the threefold axis and are related by inversion symmetry. In the crystal, the ammonia molecules are located below and above the crown ether plane and are connected by intermolecular N—H⋯O hydrogen bonds. The acetylene molecules are additionally linked by weak C—H⋯N interactions into chains that propagate in the direction of the crystallographic c axis. The 18-crown-6 molecule [occupancy ratio 0.830 (4):0.170 (4)] is disordered and was refined using a split model.
The title compound has been crystallized in liquid ammonia as a reaction product of the reductive ammonolysis of the natural compound streptozocin. Elemental rubidium was used as reduction agent as it is soluble in liquid ammonia, forming a blue solution. Reductive bond cleavage in biogenic materials under kinetically controlled conditions offers a new approach to gain access to sustainably produced raw materials.
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