1. Oppolzer, W. Synthesis 1978, 793; Haider, K.W.; Platz, M.S. J. Phys. Org. Chem. 1989, 2, 623.
2. Utley, J.H.P.; Gao, Y.; Gruber, J.; Lines, R. J. Mater. Chem. 1995, 5, 1297; Utley, J.H.P.; Gao, Y.; Gruber, J.; Zhang, Y.; Muñoz-Escalona, A. J. Mater. Chem. 1995, 5, 1837; Gruber, J. Quim. Nova 1994, 17, 323 and references therein cited.
3. Rezende, D. de B.; de Arruda Campos, I.P.; Toscano, V.G.; Catalani, L.H. J. Chem. Soc., Perkin Trans. 2, 1995, 1863.
4. Pouchert, C.J.; Behnke, J. The Aldrich Library of 13C and 1H FT-NMR Spectra, Aldrich Chemical Co.: Milwaukee, WI, 1992 [12,000 300 MHz 1H and 75 MHz 13C NMR spectra].
5. Sadtler Standard Carbon-13 NMR Spectra, Sadtler Research Laboratories, Inc.: Philadelphia, PA. 1976-