Rearrangement of unsaturated cyclic peroxides obtained by photooxygenation of 2,3-dimethylene-7-oxabenzonorbornene and 2,3-dimethylene-1,4-etheno-1,2,3,4-tetrahydronaphthalene

Ozen, R
Kormali, F
Balcı, Metin
Atasoy, B
Cobalt(II) tetraphenylporphyrin (CoTPP)-catalyzed rearrangement of peroxide 11 obtained by the photooxygenation of 5 gave a mixture of epoxides 15 (or 16) and 17. However, CoTPP-catalyzed rearrangement of peroxide 20 arising by photooxygenation of 2,3-dimethylene-1,4-etheno-1,2,3,4-tetrahydronaphthalane 6 gave 1,4-etheno-1,2,3,4-tetrahydronaphtho[b]-furan 21. The different behaviour of these endoperoxides 11 and 20 is discussed in terms of ring strain and the degree of the pyramidalization of the C=C bond


Cycloaddition Reaction of 1,4-Dihydronaphthalene 1,4-Epoxide with Cyclooctatetraene: Cope Rearrangement in an Adduct
MENZEK, Abdullah; Kelebekli, Latif; ALTUNDAŞ, Aliye; ŞAHİN, Ertan; Polat, Fatos (2008-01-01)
The reaction of 1,4-dihydro-1,4-epoxynaphthalene with cyclooctatetraene at 130 +/- 5 degrees for 14 days gave the four products 2a,3,3a,4,9,9a,10,10a-octahydro-4,9-epoxy-3,10-ethenocyclobuta[b]anthracene (13). 25-oxanonacyclo[10,10,2,2(5,9),1(14,21),0(2,11),0(3,10),0(4,6),0(13,22),0(15,20)] heptacosa-7,15,17,19,23,26-hexaene (14), 5,5a,6,6a,6b,6c,12a,12b,12c,13,13a,14-dodecahydro-5,14-epoxy-6,13-ethenocycloocta[3',4']cyclobuta[1',2',3,4]-cyclobuta[1,2-b]anthracene (15) and bis-adduct 16. The structures of t...
Synthesis and characterization of conducting graft copolymers based on oligophenols
Sahmetlioglu, Ertugrul; Arikan, Ufuk; Toppare, Levent Kamil; Yuruk, Huseyin; Mart, Hasan (Informa UK Limited, 2006-10-01)
Oligo-2-aminophenol (OAF) was synthesized with oxidative polycondensation of 2-aminophenol and hydrogen peroxide in an aqueous alkaline medium at 80 degrees C. Oligo-2-aminophenol with thiophene side groups (TOAF) was obtained by the reaction of OAF and thiophene-3-acetic acid. Graft copolymers of TOAF and pyrrole were synthesized by electrochemical polymerization in p-toluene sulfonic acid (PTSA)/water medium. Characterization of the graft copolymer (TOAF-g-Py), was carried out by combination of techniques...
An investigation of the chemical synthesis and high-temperature sintering behaviour of calcium hydroxyapatite (HA) and tricalcium phosphate (TCP) bioceramics
Tas, AC; Korkusuz, Feza; Timucin, M; Akkas, N (1997-02-01)
The experimental conditions for the synthesis of sub-micrometre, spherical particles of calcium hydroxyapatite [Ca,,(PO,),(OH),] (HA) and tricalcium phosphate [Ca,(PO,),] (TCP) are investigated through chemical coprecipitation from the aqueous solutions of calcium nitrate and di-ammonium hydrogen phosphate salts. The precipitation process employed was also found to be suitable for the production of sub-micrometre HA/TCP composite powders in situ. The synthesized pure HA and TCP powders were found to be stab...
Thermal catalytic hydrosilylation of conjugated dienes with triethylsilane in the presence of tricarbonyl(o-xylene)metal (metal = Cr, Mo, W) complexes
Kayran, C; Rouzi, P (Walter de Gruyter GmbH, 2001-11-01)
The thermal catalytic hydrosilylation of 1,3-butadiene (1), trans-2-methyl-1, 3-pentadiene (2), 2,3-dimethyl-1,3-butadiene (3), and isoprene (4), with triethylsilane were studied in the presence of M(CO)(3) (o-xylene) (M = Cr, Mo, W) complexes in polar and nonpolar solvents such as tetrahydrofuran, hexane and toluene. Mo(CO)(3) (o-xylene) was found to be the only active catalyst for the hydrosilylation of 3 with triethylsilane, which gave 1-triethylsilyl-2,3-dimethyl-2-butene (3a), as hydrosilylated product...
Hydrothermal synthesis of 3D TiO2 nanostructures using nitric acid: Characterization and evolution mechanism
Erdogan, Nursev; Öztürk, Abdullah; Park, Jongee (Elsevier BV, 2016-4)
Various morphologies of TiO2 nanostructures were synthesized by HNO3 assisted hydrothermal treatment with respect to the acid molarity (1 M, 3 M, and 8 M), temperature (110, 140, and 180 degrees C), and time (1, 3, and 6 h). An additional sample was synthesized inside the protonated titanate nanoribbon coated vessel with the acid molarity of 8M at 140 degrees C for 3 h. The crystal structure and morphology of the nanostructures synthesized were investigated using X-Ray diffractometer, scanning electron micr...
Citation Formats
R. Ozen, F. Kormali, M. Balcı, and B. Atasoy, “Rearrangement of unsaturated cyclic peroxides obtained by photooxygenation of 2,3-dimethylene-7-oxabenzonorbornene and 2,3-dimethylene-1,4-etheno-1,2,3,4-tetrahydronaphthalene,” TETRAHEDRON, pp. 7529–7535, 2001, Accessed: 00, 2020. [Online]. Available: