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- [32] Uncatalysed (thermal) and Lewis acid-promoted asymmetric hetero-Diels-Alder reaction of 1-thiabuta-1,3-dienes (thiochalcones) with di-(-)-menthyl fumarate. Configuration determination by X-ray crystallographic analysis of (2S,3R,4R)-(+)-2,3-bis[(-)-menthoxycarbonyl]-4,6-diphenyl-3,4-dihydro-2H-thiopyran and conversion of cycloadducts into optically pure diols JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1996, (15): : 1897 - 1903