NMR‐Untersuchungen an Tricyclo[5.3.0.02,8]decan‐Systemen – Ungewöhnliche Hochfeldverschiebungen bei sterisch fixierten Cycloheptadien‐Fragmenten

Abstract

NMR Investigations on Tricyclo[5.3.0.02,8]decane Systems – Unusual Highfield Shift at Sterically Fixed Cycloheptadiene FragmentsThe NMR spectra of tricyclo[5.3.0.02,8]decane (8) and some of its derivatives were investigated. The tricyclo[5.3.0.02,8]deca‐3,5‐diene (7), which contains a sterically fixed cycloheptadiene subunit, exhibits an unusual highfield shift of the homoallylic carbon atoms C‐1 and C‐8 in its 13C NMR spectrum. This is in contrast to an unusual downfield shift in compounds with fixed cyclopentene subunit.