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The incorporation of a sulfoxide on the tether connecting an alkene to
a 5-silyloxy-4-pyrone diminishes the temperature needed for inducing
their thermal [5C+2C] cycloaddition in relation to that required for a
nnulating the homologous sulfide, and allows for attaining modest leve
ls of diastereofacial selectivity. (C) 1997 Elsevier Science Ltd.