4-Phenyl-4-methyl-2,2-dibutyl-1,3,2-dioxastannolane (4). The racemic compound was prepared from a commercial diol (Janssen, >98%; mp 44-45 °C), purified by crystallization; the 42% ee sample was prepared from an enriched diol, obtained following a known procedure:20 mp 93-95 °C. 13C NMR: Ph,
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