ring, but the striking similarity in the spectral characteristics of 2 and 3 suggests that it is highly probable that 3 also exist in a chair conformation (4b). It is very tempting to carry this analogy over to 1 for which no spectral change was observed but caution is suggested in light of the recently observed change from a twist-boat conformation for cyclohexane-l,4-dione to a chair for 1,4-dimethylenecyclohexane.8 On the other hand, the negative results for 1 and 2,2-dibenzyl-5,5dimethylcyclohexane-l,3-dione1 23 do not necessarily rule out a chair conformation since cyclohexanone, which exists as a chair, does not give rise to a spectral change down to -170°.9Our work certainly indicates that more information is necessary in this area of chemistry and our objective will now be a systematic study of various derivatives of cyclohexane-1,3-dione in an attempt to determine all the relevant factors influencing conformation.
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