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85030186503
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On leave from the Chemistry Division, Department of Science Service, Rama 6 Road, Phayatai, Bangkok 10400, Thailand
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On leave from the Chemistry Division, Department of Science Service, Rama 6 Road, Phayatai, Bangkok 10400, Thailand.
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2
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Posner, G.H.; Ting, J.-S. Tetrahedron Lett. 1974, 683; Posner, G.H.; Ting, J.-S.; Lentz, C.M. Tetrahedron 1976, 32, 2281. See also Fernández Mateos, A.; Pascual Coca, G.; Pérez Alonso, J.J.; Rubio Gonzalez, R.; Tapia Hernández, C. Tetrahedron Lett. 1995, 36, 621, and references cited therein.
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20
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85030197649
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note
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1H n.m.r. spectra). (2Z,4E)-Dienals [δ ca, 10.2 ppm, CHO] were the only (Z,E)-isomers detected in the ring-opened products. Isomerisation to the more stable (2E,4E)-isomers [δ ca. 9.5 ppm, CHO], which is catalysed by acid, appeared to be the only source of contamination. The (2Z,4E)-dienals were used without delay.
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22
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85030193966
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13C), and by comparison with published data
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13C), and by comparison with published data.
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23
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Chrétien-Bessière, Y.; Garnero, J.; Benezet, L.; Peyron, L. Bull. Soc. Chim. Fr. 1967, 97; Naves, Y.-R. Bull Soc. Chim. Fr. 1967, 3152.
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For recent syntheses and a bibliography, see Chapuis, C. Tetrahedron Lett. 1992, 33, 2461; Fehr, C.; Galindo, J.; Chappuis, S. Tetrahedron Lett. 1992, 33, 2465.
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0026551559
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For recent syntheses and a bibliography, see Chapuis, C. Tetrahedron Lett. 1992, 33, 2461; Fehr, C.; Galindo, J.; Chappuis, S. Tetrahedron Lett. 1992, 33, 2465.
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For other syntheses of 17, see (a) Baeckström, P.; Jacobsson, U.; Norin, T.; Unelius, C.R. Tetrahedron 1988, 44, 2541;
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85030193158
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All compounds are racemic. Yields refer to isolated, chromatographically homogeneous materials
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All compounds are racemic. Yields refer to isolated, chromatographically homogeneous materials.
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40
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The reagent was prepared in THF/hexane
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Perspective views of the cyclobutene moiety were generated using the published X-ray crystal data for cis-3-cyclobutene-1,2-dicarboxylic acid (Benedetti, E.; Ciajolo, M.R.; Declercq, J.P.; Germain, G. Acta Cryst. 1974, B30, 2873).
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