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5 g (23.8 mmol) of 1-vinylcyclododecanol, quartz reactor 25/400 mm, temperature 660° C.±10, vaporization at 125-135° C. (airbath temperature) in about 30 min. Nitrogen stream about 1-2 l/h, vacuum 4-6 mbar. The oily condensate began to crystallize in the cool trap already. 4.4 g (88% crude yield) of a wax-like solid were obtained which, according to GC and GC/MS analyses, comprises as well as 80-85% of the main component also up to about 5% cyclododecanone and about 5-10% other components which, according to the molecular masses found, are dehydrogenation products. Recrystallization twice from hexane at 0° and −20° C., gave 3.6 g (72%) of cyclotetradecanone (GC purity>98%) as colorless needles with a melting point of 56° C.

1. customto crystallize in the cool trap already
2. custom4.4 g (88% crude yield) of a wax-like solid were obtained which
3. customRecrystallization twice from hexane at 0°