... Tetrahedron Letters. Volume 47, Issue 35, 28 August 2006, Pages 6309–6314. ... After recrystallization of the crude products from chloroform and petroleum ether, F DMTC-Cls 6a–d 22 were obtained in 45% (6a), 47% (6b), 46% (6c) and 18% (6d) yields as colorless solids. ...