Catalan, Javier; Fabero, Fernando; Claramunt, Rosa M.; Dolores Santa Maria; De la Concepcion Foces-Foces; Cano, Felix Hernandez; Martinez-Ripoll, Martin; Elguero, Jose; Sastre, Roberto Journal of the American Chemical Society, 1992 , vol. 114, # 13 p. 5039 - 5048