... Tetrahedron. Volume 57, Issue 2, 7 January 2001, Pages 365–370. ... Hexane–ethyl acetate was used as an eluent. The injection volume was 20 μl or 500 μl. ... in: BM Trost, I. Fleming, G. Pattenden (Eds.), Comprehensive Organic Synthesis, Vol. 3, Pergamon, Oxford (1991), pp. ...