- Theory and practice: Bulk synthesis of C3B and its H2- and Li-storage capacity
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Previous theoretical studies of C3B have suggested that boron-doped graphite is a promising H2- and Li-storage material, with large maximum capacities. These characteristics could lead to exciting applications as a lightweight H
- King, Timothy C.,Matthews, Peter D.,Glass, Hugh,Cormack, Jonathan A.,Holgado, Juan Pedro,Leskes, Michal,Griffin, John M.,Scherman, Oren A.,Barker, Paul D.,Grey, Clare P.,Dutton, Sian E.,Lambert, Richard M.,Tustin, Gary,Alavi, Ali,Wright, Dominic S.
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supporting information
p. 5919 - 5923
(2015/05/13)
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- SELECTIVE MONO- OR DIMETALATION OF ARENES BY MEANS OF SUPERBASIC REAGENTS
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If employed in tetrahydrofuran, stoichiometric amounts of butyllithium and potassium tert-butoxide react with benzene under clean monometalation.In hexane suspension, however, considerable amounts of meta- and para-disubstituted by-products are obtained (approx. 10percent).They become preponderant if a three-fold excess of the metalating agent is used.Naphthalene leads under the same conditions to a mixture of two mono- and ten di-substituted derivatives. - Alkyl groups, as present in tert-butylbenzene, retard the metalation at both m- and p-positions, while trialkylsilyl groups deactivate only m-position.In either case exclusive monosubstitution occurs. - Perdeuterobenzene undergoes metalation and subsequent electrophilic mono- or disubstitution to afford isotope labeled compounds with moderate, though synthetically attractive yields.The kinetic isotope effects and product ratios can be taken as evidence for aggregate formation at the level of both the superbasic metalating reagent and the organometallic intermediates.
- Schlosser, Manfred,Choi, Jung Hoon,Takagishi, Sadahito
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p. 5633 - 5648
(2007/10/02)
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- Retinobenzoic Acids. 5. Retinoidal Activities of Compounds Having a Trimethylsilyl or Trimethylgermyl Group(s) in Human Promyelocytic Leukemia Cells HL-60
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The retinoidal activities of trimethylsilyl or trimethylgermyl-containing retinobenzoic acids are discussed on the basis of differentiation-inducing activity on human promyelocytic leukemia cells HL-60.Compounds with a trimethylsilyl or trimethylgermyl gr
- Yamakawa, Takeru,Kagechika, Hiroyuki,Kawachi, Emiko,Hashimoto, Yuichi,Shudo, Koichi
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p. 1430 - 1437
(2007/10/02)
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- REVERSIBILITY IN THE HOMOLYTIC AROMATIC SUBSTITUTION WITH SILYL AND GERMYL RADICALS
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The 3,6-bis(trimethylsilyl)cyclohexadienyl radical (1), generated from the corresponding cyclohexadiene, gave the expected p-bis(tri-methylsilyl)benzene (4) at 0 deg.C.At 130 deg.C, however, the reaction afforded trimethylsilylbenzene, 4, and m-bis(trimethylsilyl)benzene in 62, 17, and 5percent yield, respectively.The suggested elimination of the trimethylsilyl radical from the cyclohexadienyl radical is demonstrated by ESR.
- Sakurai, Hideki,Kira, Mitsuo,Sugiyama, Hisashi
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p. 599 - 602
(2007/10/02)
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- ELECTRON SPIN RESONANCE AND CHEMICAL STUDIES ON THE 6-(TRIMETHYLSILYL)CYCLOHEXADIENYL AND RELATED RADICALS.
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Various 3,6-disubstituted cyclohexadienyl radicals were generated and investigated by ESR at low temperature. Analysis of the ESR parameters indicated that the significant out-of-plane deformation of the carbon framework of 6-Me//3Si- and 6-Me//3Ge-substituted cyclohexadienyl radicals occurred to gain stabilization due to the effective hyperconjugation between the substituted methylene pseudo- pi orbital and the pi SOMO, while the 6-unsubstituted and 6-t-Bu cyclohexadienyl radicals were essentially planar. Investigation of the fate of the 3,6-bis(trimethylsilyl)cyclohexadienyl radical showed strong evidence for the temperature-dependent reversibility of the silyl radical addition to aromatics. The spontaneous elimination of the trimethylsilyl radical was proved by spin-trapping experiments.
- Kira,Sugiyama,Sakurai
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p. 6436 - 6442
(2007/10/02)
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