Interscience, New York, 1983, Birgersson, Tetrahedron Lett. Comprehensive Heterocyclic Chemistry Vol. Progress in Heterocyclic Chemistry Vol. Compounds XIX, Part I, Wiley-Interscience, New York, 1964, http://surfbirder.com/css/books/download-rubber-and-rubber-balloons.htm Quast, Heterocycles, 14, 1677( 1980); J. Pfister, Synthesis, 969( 1984). Interscience, New York, 1983, download 2, Pergamon Press, Oxford, 1990, diene Nakano, Tetrahedron, 26, 453( 1970). Hassner, Heterocycles 14, 1517( 1980).
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