The conformations of triostin A in solution

Abstract
The two symmetrical conformations of triostin A in deuteriochloroform have been investigated by 1H n.m.r. spectroscopy. The occurrence of two conformations is rationalised as resulting from the reversal of chirality of the disulphide bond, which is postulated to exist as a rapidly interconverting mixture of several rotameric states. Analysis of the spectrum of the least polar conformer is consistent with the presence of an intramolecular hydrogen bond.