1. T. Imamoto, Y. Sugiura, N. Takiyama. Organocerium reagents. Nucleophilic addition to easily enolizable ketones. Tetrahedron Letters, Vol. 25, Iss. 38, 1984, P. 4233-4236.
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http://dx.doi.org/10.1016/S0040-4039(01)81404-02. T. Hirao, D. Misu, T. Agawa. Versatile synthesis of α, β-acetylenic ketones by oxidative nucleophilic addition of vanadium acetylides. Tetrahedron Letters, Vol. 27, Iss. 8, 1986, P. 933-934
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http://dx.doi.org/10.1016/S0040-4039(00)84141-6