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Syntheses and PE‐Spectroscopic Investigations of 2,6‐ and 3,5‐Bridged 1,4‐Dimethylidenecyclohexanes
Author(s) -
Chou TehChang,
Lange Holger,
Gleiter Rolf,
Gögh Tibor,
Kríž Miroslav,
Pfenninger Max H.,
Valentíny Marian,
Ganter Camille
Publication year - 1995
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19950780809
Subject(s) - chemistry , x ray photoelectron spectroscopy , interpretation (philosophy) , spectroscopy , spectral line , stereochemistry , computational chemistry , crystallography , nuclear magnetic resonance , physics , quantum mechanics , astronomy , computer science , programming language
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 .