[CH:1]([CH:3]1[CH2:14][CH2:13][CH2:12][CH2:11][CH2:10][CH2:9][CH2:8][CH2:7][CH2:6][CH2:5][C:4]1=[O:15])=[CH2:2].C(=C1/C(=O)CCCCCCCCCC/1)/C>>[CH:1](=[C:3]1/[C:4](=[O:15])[CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14]/1)\[CH3:2]On the other hand, 2-vinylcyclododecanone (2) which is the object product is one having the lowest boiling point among the components of the equilibrated mixture. Specifically, the average relative volatility of each of these components is as follows though it varies depending on temperature: when the boiling point is 110° C., the average relative volatility of each of 2-(Z)-ethylidenecyclododecanone (1-b) and 2-vinylcyclododecanone (2) is 1.15 and 1.44, respectively provided that the average relative volatility of 2-(E)-ethylidenecyclododecanone (1-a) is defined as 1.00.
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