Barriers to ring rotation in 1,1',4,4'-tetra-tert-butyluranocene and 1,1',3,3'-tetra-tert-butylferrocene
Journal Article
·
· Journal of the American Chemical Society
- 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 Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1090444
- Report Number(s):
- LBL-11722
- Journal Information:
- Journal of the American Chemical Society, Vol. 103, Issue 12; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
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