Ytterbium Trifluoromethanesulfonate Yb(OTf)3: An Efficient, Reusable Catalyst for Highly Selective Formation of β-Alkoxy Alcohols via Ring-Opening of 1,2-Epoxides with Alcohols - Likhar, Pravin R; Praveen Kumar, Manyam; Bandyopadhyay, Ananda K (Synlett, 2001)