BF3·SiO2: an efficient alternative for the synthesis of 14-aryl or alkyl-14H-dibenzo[a,j]xanthenes
Bi Bi Fatemeh Mirjalilia, Abdolhamid Bamoniri and Ali Akbari
Tetrahedron Letters Volume 49, Issue 45, 3 November 2008, Pages 6454-6456
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http://dx.doi.org/10.1016/j.tetlet.2008.08.101