... 3576 CAN. J. CHEM. VOL. 52, 1974 by HG Viehe. ... 2011. TFP as a ligand in Au(i)-catalyzed dihydropyran synthesis. Unprecedented rearrangement of dihydropyrans into cyclopentenones. Chemical Communications 47, 9390. ... Tetrahedron Letters 46, 69-74. [CrossRef] 12. ...