Gear Effects in Polycyclohexyl Systems: Tetracyclohexylethene

Ishay Columbus, Silvio E. Biali*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Tetracyclohexylethene (4) was synthesized by McMurry coupling of dicyclohexyl ketone. The and 13C NMR spectra of 4 were analyzed by means of 2D NMR techniques. The compound exists both in solution and in the crystal in a conformation with a “tongue and groove” arrangement, i.e., in an arrangement in which the methine hydrogens are located in the notch provided by the methylene protons of a neighboring cyclohexyl ring. Molecular mechanics calculations reproduce satisfactorily the structural parameters found in the crystal structure of 4. The barrier for rotation of the cyclohexyl rings was measured by dynamic NMR from the exchange of syn and anti methine protons. This barrier is 18.7 kcal mol-1, i.e., higher than that of tetraisopropylethene (ca. 16 kcal mol-1). Molecular mechanics calculations of the rotational pathway suggest that the larger barrier observed for 4 is due to conformational restrictions imposed by the cyclohexyl rings.

Original languageAmerican English
Pages (from-to)3402-3407
Number of pages6
JournalJournal of Organic Chemistry
Volume59
Issue number12
DOIs
StatePublished - 1 Jun 1994

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