[CH3:1][C:2]12[C:8]([CH3:10])([CH3:9])[CH:5]([CH2:6][CH2:7]1)[CH2:4][C:3]2=O.C[Li]>CCOCC>[CH3:1][C:2]12[C:8]([CH3:10])([CH3:9])[CH:5]([CH2:6][CH2:7]1)[CH:4]=[CH:3]21,7,7-Trimethylbicyclo[2.2.1]heptan-2-one (1-camphor) was converted into its 4-toluenesulfonylhydrazone, which was then reacted with methyllithium in ether, to give the title compound. The method used was that described by Shapiro and Duncan, Organic Synthesis, Vol 51, pp 67-69, for the conversion of racemic camphor into racemic 1,7,7-trimethylbicyclo[2.2.1]hept-2-ene.
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