Barriers to ring rotation in 1,1',4,4'-tetra-tert-butyluranocene and 1,1',3,3'-tetra-tert-butylferrocene

Journal Article · Mon Jun 01 04:00:00 EDT 1981 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00402a001· OSTI ID:1090444

Luke, Wayne D. ^[1]; Streitwieser, Jr., Andrew ^[1]

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1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The ¹H-NMR spectra of 1,1',4,4'-tetra-tert-butyluranocene show a singlet for the tert-butyl protons and three singlets for the ring protons. Coalescence occurs at -65 to -85°C with splitting of each peak at lower temperatures, corresponding to ΔG* of rotation of 8.3 Kcal mol^-1. Also, coalescence was also observed for 1,1',3,3'-tetra-tert-butylferrocene and a corresponding ΔG* = 13.1 Kcal mol^-1 was obtained.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1090444
• Report Number(s): LBL--11722
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 12 Vol. 103; ISSN 0002-7863
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY