Dull, Gary Maurice; Wagner, Jared Miller; Caldwell, William Scott; Miller, Craig Harrison; Schmitt, Jeffrey Daniel; Bhatti, Balwinder Singh; Hadimani, Srishailkumar Basawannappa
Patent: US6262124 B1, 2001 ;

Martin, Stephen F.; Williamson, Sidney A.; Gist, R. P.; Smith, Karl M.
Journal of Organic Chemistry, 1983 , vol. 48, # 26 p. 5170 - 5180