The solution thermochemistry at 25 °C of [graphic omitted], RB(OEt)2, [graphic omitted] [R = Ph or Bun, n= 2, 3, or 4] is described. Appropriate enthalpies of transition are determined and cyclic strain energies of the heterocycles are estimated. The influence of steric and electronic effects on these strain energies is discussed.
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Finch et al. (1970) studied this question.