1) Tetrahedron Letters
Volume 37, Issue 3, 15 January 1996, Pages 315-318
Oxidation of pyrrole α-methyl to methoxymethyl with ceric triflate
Thomas Thyrann, David A. Lightner
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http://dx.doi.org/10.1016/0040-4039(95)02161-2
2) Tetrahedron Letters
Volume 39, Issue 50, 10 December 1998, Pages 9271-9274
Oxidation of polyhydroxyalkyl - heterocycles by cerium (IV). A convenient route to pyrrole-2,5-dicarbaldehydes
Antonio J Moreno-Vargas, Inmaculada Robina, JoséG Fernández-Bolaños, José Fuentes
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http://dx.doi.org/10.1016/S0040-4039(98)02083-8