... Tetrahedron Letters. Volume 50, Issue 9, 4 March 2009, Pages 1045–1047. ... 5 A variety of dehydrating reagents, including H 2 SO 4 , 5 POCl 3 , 6 SOCl 2 , 7 (CF 3 CO 2 ) 2 O, 8 COCl 2 , 9 p-TsOH 10 and CF 3 SO 3 H 11 , have been applied for oxazole synthesis. ...