The helical structures of the new highly strained [2.2]metacyclophanes (5)(the structure of which has been determined by X-ray crystallography) and (8) have been studied and the four stereoisomeric sulphoxides (6) obtained from (5) have been separated by h.p.l.c.; the diastereoisomeric excess in the oxidation of the helical sulphide (5) to yield the sulphoxides (6) is 91%.
F. Vögtle, J. Struck, H. Puff, P. Woller and H. Reuter, J. Chem. Soc., Chem. Commun., 1986, 1248 DOI: 10.1039/C39860001248
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