Abstract The Grignard reagent from 5-chloro-3-methyl-1-hexene cyclized reversibly to form an equilibrium mixture with two stereoisomers of the 2, 4-dimethylcyclobutylmethyl-Grignard reagent. Equilibrium and rate constants for the opposing reactions have been evaluated at 80–100 and 100–120 C, respectively. Over this range, the equilibrium mixture favors the cyclic reagent by a ratio of about Full-size image (< 1 K)
[Ashcroft, Martyn M.; Bougeard, Peter; Bury, Adrian; Cooksey, Christopher J.; Johnson, Michael D.; et al. Journal of Organic Chemistry, 1984 , vol. 49, # 10 p. 1751 - 1761]