✦ LIBER ✦

Syntheses and PE-Spectroscopic Investigations of 2,6- and 3,5-Bridged 1,4-Dimethylidenecyclohexanes

✍ Scribed by Teh-Chang Chou; Holger Lange; Rolf Gleiter; Tibor Gögh; Miroslav Kríž; Max H. Pfenninger; Marian Valentíny; Camille Ganter

Publisher: John Wiley and Sons
Year: 1995
Tongue: German
Weight: 834 KB
Volume: 78
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19950780809

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✦ Synopsis

Abstract

Three 1,4‐dimethylidenecyclohexanes, bridged in the 2,6‐ and 3,5‐positions by two ethano (4), one ethano and one propano (5), and two propano bridges (6) have been synthesized. The interaction of the two exocyclic methylidene groups has been investigated by He(I) photoelectron (PE) spectroscopy. It revealed a slightly larger energy difference (0.8 eV) for 4 and 5 as compared to the parent 1,4‐dimethylidenecyclohexane (7) (0.7 eV). The interpretation of the PE spectra was based on the comparison with PE data of related systems and with the results of semiempirical calculations on 4–6.

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