{SA} 2. Ogliaro F. et al. Inorg. Chem. 37 , 6199, (1998)

{PUB} Comparative Toxicogenomics Database (CTD)|PubChem --- Genotoxic Changes to Rodent Cells Exposed in Vitro to Tungsten, Nickel, Cobalt and Iron --- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3987013

{ALF} In combination with silica, is a useful acid catalyst for, e.g. acetylation of alcohols: Tetrahedron Lett., 39, 3263 (1998), tetrahydropyranylation of alcohols and dithioacetalization of aldehydes: Tetrahedron, 53, 14997 (1997).

{ALF} In the presence of Zn metal, low-valent Ta complexes are formed with alkynes which react with carbonyl compounds to form (E)-allylic alcohols: J. Org. Chem., 55, 1707 (1990); 57, 321 (1992). Similarly, regioselective additions to alkenes can also be effected: J. Org. Chem., 59, 5852 (1994). With allylic alcohols, 1,4-dienes are formed: Chem. Lett., 315 (1995).

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