Diverse oxidants such as NBS, DDQ, KMnO4, IBX, DIB and last but not least molecular oxygen have been used as an oxidant for this purpose. Complexes H-exo-IrH(Cl)(CO)[t-BuP,C,PFe] (20), Ir(CO)[t-BuP,C,PFe] (21), and Ir(CO)[2,6-(tBu2PO)2C6H3] (30) were characterized by X-ray crystallography. ResearchGate has not been able to resolve any citations for this publication. of the whole article in a thesis or dissertation. The 3α-cholestanyl ester of 5-(4-benzoylphenyl)-valeric acid underwent direct photochemical hydrogen transfer upon irradiation, thereby providing a simple route to Δ14 and Δ16 steroids, in 53% yield: a minor proportion of this reaction led to steroidal macrolides. Catalytic oxidative dehydrogenation of tetrahydroquinolines to afford bioactive molecules. Wu, J.; Talwar, D.; Johnston, S.; Yan, M.; Xiao, J. Ritchie, T. J.; Macdonald, S. J. F.; Peace, S.; Pickett, S. D.; Luscombe, C. N. Burgett, A. W. G.; Li, Q.; Wei, Q.; Harran, P. G. Gao, P.; Tsao, H. N.; Grätzel, M.; Nazeeruddin, M. K. Katsura, Y.; Inoue, Y.; Nishino, S.; Tomoi, M.; Takasugi, H. Serafin, B.; Borkowska, G.; Główczyk, J.; Kowalska, I.; Rump, S. Cagir, A.; Jones, S. H.; Gao, R.; Eisenhauer, B. M.; Hecht, S. M. Chan, H.-L.; Yip, H.-Y. ), while dibenzyl is partly dehydrogenated to stilbene. ; Mak, N.-K.; Leung, K.-N. Tsou, H.-R.; Mamuya, N.; Johnson, B. D.; Reich, M. F.; Gruber, B. C.; Ye, F.; Nilakantan, R.; Shen, R.; Discafani, C.; DeBlanc, R.; Davis, R.; Koehn, F. E.; Greenberger, L. M.; Wang, Y.-F.; Wissner, A. Wakeling, A. E.; Barker, A. J.; Davies, D. H.; Brown, D. S.; Green, L. R.; Cartlidge, S. A.; Woodburn, J. R. Kung, P.-P.; Casper, M. D.; Cook, K. L.; Wilson-Lingardo, L.; Risen, L. M.; Vickers, T. A.; Ranken, R.; Blyn, L. B.; Wyatt, J. R.; Cook, P. D.; Ecker, D. J. Jung, I.-P.; Ha, N.-R.; Lee, S.-C.; Ryoo, S.-W.; Yoon, M.-Y. Removal of the H-2 Can also be effected by bubbling argon. Draw structures of SF4 in a way that indicates their molecular shape? In all cases the Ref. doi:10.3762/bjoc.13.162. ChemInform Abstract: Palladium Acetate Catalyzed Oxidative Aromatization of Methylenecyclopropanes. Scheme 30: For reproduction of material from all other RSC journals and books: For reproduction of material from all other RSC journals. The mechanistic implications with respect to olefin vs. allylic oxidation and oxidation vs. π-allylpalladium formation are discussed. it in a third party non-RSC publication you must Similar reaction of 2,3-dehydronaphthalene with these same two dienes provides analogous cycloadducts which can then be oxidized to anthro[a]cyclobutene and anthro[b]cyclobutene. A number of experiments were undertaken to differentiate between homogeneous, molecularly defined catalysis and heterogeneous, nanocluster-based catalysis. [(triphos)WH6] (6; triphos = PhP(CH2CH2-PPh2)2) is also notable in that, for the first time, base-metal homogeneous catalysts are shown to be effective in alkane dehydrogenation. $$\alpha$$, $$\beta$$ dehydrogenation (oxidation) of an alkane: Mechanism: In many enzymatic reactions in which $$FADH_2$$ acts as the reducing agent, the reaction cycle is completed when $$FAD$$, rather than being released from the active site, is recycled back to $$FADH_2$$ with the concomitant oxidation … The [2 + 4] cycloaddition of benzyne with 1,2-dimethylenecyclobutane or 1-vinylcyclobutene leads to the formation of an adduct which can be dehydrogenated with DDQ to provide naphtho[b]cyclobutene or naphtho[a]cyclobutene, respectively. Facile inversion of unhindered sterol configuration, Synthesis of digitoxigenin by remote functionalization, Unusual structural effects on the chemical degradation of steroid sidechains, Activation of C-H bonds in saturated hydrocarbons. A variety of catalysts have been studied for alkane dehydrogenation activity. Product yields decreased at temperatures greater than 125 °C, most likely because of the instability of the metathesis catalysts at such temperatures. One-electron oxidative interception of δ-carbon radical by cupric acetate does not involve the corresponding carbonium ion; instead, the alkyl-copper intermediate 11 is formed and by elimination affords olefinic alcohols. Recently Török et al. 1b ([IrH2(O2CR)(PCY3)2]; CY = cyclohexyl, R = C2F5) is interesting in that initial deactivation leads to a less active catalyst, but one which is stable to further deactivation. Catalytic oxidative dehydrogenation of tetrahydroquinolines to afford bioactive molecules. Douglas A. Klumpp, © 2017 Hati et al. Starting from a 1,3-diyne and a 1,3-diene, the reaction sequence consisting of cobalt-catalyzed Diets-Alder reaction, DDQ oxidation, and cobalt-catalyzed cyclotrimerization with acetylene gave an axially chiral biphenyl-terphenyl product. Wang, Z.; Tonks, I.; Belli, J.; Jensen, C. M. Damodara, D.; Arundhathi, R.; Likhar, P. R. Mikami, Y.; Ebata, K.; Mitsudome, T.; Mizugaki, T.; Jitsukawa, K.; Kaneda, K. Hara, T.; Mori, K.; Mizugaki, T.; Ebitani, K.; Kaneda, K. Han, B.; Liu, Z.; Liu, Q.; Yang, L.; Liu, Z.-L.; Yu, W. Peng, F.; McLaughlin, M.; Liu, Y.; Mangion, I.; Tschaen, D. M.; Xu, Y. Zhou, W.; Taboonpong, P.; Aboo, A. H.; Zhang, L.; Jiang, J.; Xiao, J. Li, X.; Li, C.; Yin, B.; Li, C.; Liu, P.; Li, J.; Shi, Z. Chen, Y.-X. 3 mM) solutions of the bis(phosphine) rhenium heptahydrides (Ar3P)2ReH7(Ar =p-F-;C6H4, Ph, and p-Me-C6H4) in the cycloalkane, with an olefin as the hydrogen acceptor.