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    Cycloaddition reactions of (eta(6)-tropone) tricarbonylmetal(0) complexes of group 6 metals with alkynes
    (Inst Organic Chem And Biochem, 2002) Morkan, İzzet Amour; Morkan, Ayşe Üztetik
    (eta(6)-Cyclohepta-2,4,6-trien-1-one) tricarbonylmetal(0) complexes of chromium (2a), molybdenum (2b), and tungsten (2c) are formed when tris( acetonitrile) tricarbonylchromium(0), mo-lybdenum(0), and tungsten(0), respectively, are treated photochemically with tropone (cyclohepta-2,4,6-trien-1-one) 1. UV photolysis of 2a-2c and RCequivalent toCR' (R=R'=Ph, Me3Si, Et; R=Ph, R'=Me3Si) in toluene gives the [6+2] cycloadducts, (eta(4), eta(2)-8,9-diphenylbicyclo-[4.2.1] nona-3,5,8-trien-1-one) tricarbonylmetal(0) 3a-3c,(eta(4), eta(2)-8,9-bis(trimethylsilyl) bicyclo[4.2.1] nona-3,5,8-trien-1-one) tricarbonylmetal(0) 4a-4c,(eta(4), eta(2)-8,9-diethylbicyclo[4.2.1] nona-3, 5,8-trien-1-one) tricarbonylmetal(0) 5a-5c, and (eta(4), eta(2)-8-phenyl-9-(trimethylsilyl) bicyclo-[4.2.1] nona-3,5,8-trien-1-one) tricarbonylmetal(0) 6a-6c. Compounds 2a-2c, 3a-3c, 4a-4c, 5a-5c, and 6a-6c were purified by chromatography, recrystallized and isolated as analytically pure crystalline solids in moderate yields and characterized by mass, IR, and NMR spectroscopy. Pure organic heterobicyclotriene ligands 7a, 8a, 9a, and 10a were isolated from 3a, 4a, 5a, and 6a, respectively, by treatment with cerium(IV) ammonium nitrate (R=R'=Me3Si; R=Ph, R=Me3Si) or by heating in toluene (R=R'=Ph, Et). It was not possible to isolate the bicyclic complexes resulting from the reactions of 2a-2c with terminal alkynes like phenylacetylene.
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    Intermediate products in solid-state reactions of gadolinium oxide and ammonium dihydrogen phosphate
    (Wiley-V C H Verlag Gmbh, 2007) Morkan, Ayşe Üztetik; Morkan, İzzet; Demirözü, Sevim Şenol; Güler, Hikmet
    The solid-state reactions of Gd2O3 with NH4H2PO4 using various molar ratios (3:6, 2:8, 1:6 and 1:8) of the reactants were investigated at different temperatures (350-1100 degrees C) to observe the intermediate compounds. Analysis of the X-ray powder diffraction patterns of the products obtained at 350 degrees C; for the compositions of 2:8, 1:6 and 1:8 molar ratios revealed the formation of a new compound, NH4GdHP3O10 which was reported previously for Nd, Ho and Er. At higher temperatures, gadolinium tripolyphosphate was obtained for all of the molar ratios. On the other hand, the IR data of the products also confirmed the proposed reaction pathways. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.