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see also: d) O. Witt, H. Mauser, T. Friedl, D. Wilhelm, T. Clark, J. Org. Chem. 1998, 65, 959;
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48749141498
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A related rearrangement has been previously reported by Corey et al. who obtained α-triisopropylsilyl ketones from carbanions of triisopropylsilyl enol ethers of 4-tert-butylcyclohexanone derivatives: E. J. Corey, C. Rücker, Tetrahedron Lett. 1984, 25, 4345.
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0006084284
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note
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2t(Bu) which were formed by silylation of intermediates C or D, respectively.
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39
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33947094657
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Aldehydes and ketones have been converted into terminal allenes by reaction with α-lithiovinylsilanes and subsequent fluoride-mediated Peterson olefination of the 1-hydroxy-2-trimethylsilylpropenes formed: T. H. Chan, W. Mychajlowskij, B. S. Ong, D. N. Harpp, J. Org. Chem. 1978, 43, 1526.
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1NMR and IR data and the melting point (194-196°C) of 13c were identical to those of cis-1,2-diphenyl-anti-3,4-dibenzylidenecyclobutane which was prepared by heating 1,3-diphenylallene in refluxing benzene: E. V. Dehmlow, Chem. Ber. 1967, 100, 3260.
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0006078803
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note
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Crystallographic data (excluding structure factors) for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication nos. CCDC-145872 (8g), CCDC-140090 (9a), and CCDC-145595 (10b). Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB21EZ, UK (fax: (+44) 1223336-033; e-mail: depsoti@ccdc.cam.ac.uk)..
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University of Göttingen, Germany
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G. M. Sheldrick, SHELXL-97, University of Göttingen, Germany, 1993.
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SHELXL-97
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Sheldrick, G.M.1
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