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| | ONLINE | ISSN | : | 1348-0634 | | PRINT | ISSN | : | 0009-2673 |
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| | Bulletin of the Chemical Society of Japan |
| Vol. 78 (2005) , No. 7 pp.1351-1353 |
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 | Rotational Isomerism Involving an Acetylenic Carbon VII. Restricted Rotation about Acetylenic Axis in a Diphenylethyne Derivative with Sterically Crowded m-Terphenyl Moieties
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| | | 1) Department of Chemistry, Faculty of Science, Okayama University of Science |
| (Received February 14, 2005)
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Bis(2,4,4″,6-tetramethyl-1,1′:3′,1″-terphenyl-2′-yl)ethyne was prepared by the Hart reaction and the Stille coupling as a sterically crowded diphenylethyne derivative. The barrier to rotation about the acetylenic axis was determined by the dynamic NMR method to be 51 kJ mol−1. The restricted rotation is attributed to the steric hindrance of the two mesityl groups in the m-terphenyl moieties. |
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| doi:10.1246/bcsj.78.1351 | | JOI JST.JSTAGE/bcsj/78.1351 |
| Copyright (c) 2005 The Chemical Society of Japan |
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