Abstract
3-Methylene-2, 6-heptandione (2) was obtained by the dimerization reaction of methyl vinyl ketone (1), using the catalyst, consisted of cobalt or nickel dichloride.. and triphenylphosphine in protic solvents, at room temperature and under atmosphere. The yield of 2 became constant when the molar ratio of triphenylphosphine to metal salt was above 3: 1. ln case of Rh, Ru or Pd salt and triphenylphosphine catalyst, (2) and B-ethoxymethyl ethyl ketone (3) were obtained.
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