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Arai, S., Sudo, Y., and Nishida, A., 2005, “Niobium pentachloride-silver perchlorate as an efficient catalyst in the Friedel-Crafts acylation and Sakurai-Hosomi reaction of acetals”, Tetrahedron, Vol. 61, No. 19, pp. 4639-4642.

has been cited by the following article:

• TITLE: Novel Technology for Chlorination of Niobium and Tantalum Oxides and Their Low-Grade Ore Concentrates

  AUTHORS: B. A. Shainyan, Yu. S. Danilevich, Yu. L. Garmazov, A. L. Finkelstein, T. S. Aisueva, V. K. Turchaninov

  KEYWORDS: niobium oxide, tantalum oxide, carbochlorination

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.7 No.2, June 20, 2008

  ABSTRACT: A novel energy-economic and environmentally benign technological procedure for chlorination of niobium and tantalum oxides as well as their low-grade ore concentrates was elaborated. The process is based on using carbon tetrachloride or silicon tetrachloride as a chlorinating agent under pressure. It proceeds at moderate temperatures and is free from the shortcomings of conventional carbochlorination processes such as the use of chlorine gas at very high temperatures and formation of toxic products and ozone depleting agents (phosgene, carbon monoxide, chlorohydrocarbons).