Cyclotrimerisation catalytique d'alcynes par des complexes du nickel formes ''in situ''

Article abstract of DOI:10.1016/0022-328X(88)80249-3

Catalytic cyclotrimerization of acetylenic compounds by transient complexes formed in the reduction of nickel halides by magnesium, occurs with many alkynes; however, this cyclization is hindered when bulky groups are close neighbors of the triple bond or when acceptor groups are in the α position with respect to the unsaturated carbon.On the other hand, the yield of trimer increases to become quantitative with releasing substituents.