structure and chiropticalproperties of carbapenams through use of electronic circular dichroism spectroscopy (ECD). The applicability of the helicity rule that correlates the molecular structures of various β-lactam analogues and their ECD spectra is examined against a set of differently substituted carbapenams. It is demonstrated that the studied compounds conform to the rule. The rule can be also
A family of functionalised tribactams has been prepared using a new approach. The two main steps are an intramolecular metathesis reaction and a Diels-Alder cyclisation. (C) 2001 Elsevier Science Ltd. All rights reserved.