. Author manuscript; available in PMC: 2012 Apr 27.

Published in final edited form as: J Am Chem Soc. 2011 Mar 31;133(16):6429–6439. doi: 10.1021/ja2009746

Table 1.

Results of EXSY experiments detailing the cis-trans exchange of alkyl-substituted metallacycles at –87 °C (186 K).

	olefin	k_{cis_→trans} (s^–1)	ΔG^≠_{cis_→trans} (kcal/mol)	k_{trans_→cis} (s^–1)	ΔG^≠_{trans_→cis} (kcal/mol)
8b ⇆ 8c	propene	0.76 ± 0.06	10.80 ± 0.03	0.19 ± 0.02	11.31 ± 0.04
11b ⇆ 11c	1-butene	0.74 ± 0.06	10.81 ± 0.03	0.17 ± 0.01	11.35 ± 0.03
12b ⇆ 12c	1-hexene	0.9 ± 0.1	10.7 ± 0.1	0.18 ± 0.02	11.33 ± 0.08