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    Functionalization of saturated hydrocarbons.: High temperature bromination of octahydropentalene.: Part 19
    (Pergamon-Elsevier Science Ltd, 2005) Günbas, DD; Algi, F; Hökelek, T; Watson, WH; Balci, M
    The synthesis and thermal bromination of octahydropentalene was studied. The reaction afforded 1a,3a,4b,6b-tetrabromo-1,2,3, 4,5,6-hexahydropentalene (14) with remarkable regio- and stereospecificity. The structure of the product was determined by H-1 and C-13 NMR data and single X-ray structural analysis. The treatment of octahydropentalene with tenfold bromine gave the octabromopentalene derivative. The formation mechanism of the products is discussed. (c) 2005 Elsevier Ltd. All rights reserved.
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    X-ray analsysis of sideroxol from Sideritis leptoclada
    (Springer/Plenum Publishers, 2005) Kiliç, T; Yildiz, YK; Topçu, G; Gören, AC; Ay, M; Bodige, SG; Watson, WH
    Sideroxol (1), a kaurane diterpene which has the ent-7 alpha,18-dihydroxy-15 beta,16 beta-epoxykaurane structure (MW = 320.47, C20H32O3) was obtained from the acetone extract of Sideritis leptoclada plant as well as from some other Sideritis species. It crystallizes in the orthorhombic space group P2(1), 2(1), 2(1) with a = 10.967(3), b = 24.555(5), c = 6.372(4) angstrom, Dc = 1.240 g cm(-3), Z = 4, and refines to R = 0.065 for 721 independent reflections. The skeleton consists of three fused six-membered rings and a five-membered ring with fused epoxide. The six membered rings exhibited slightly distorted chair conformation. In addition to sideroxol, two kaurane and five kaurene diterpenes were isolated from the hexane and acetone extracts of the studied plant.