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Ti-MCM-41 materials synthesised at room temperature as catalysts for cyclisatio...
Ramos, S.S.; Castilho, P.; Rodrigues, A.I.; Galacho, Cristina; Carrott, Manuela; Carrott, PeterIn the present work we extend the applicability of those Ti-MCM-41 materials, as heterogeneous catalysts, to produce an important intermediate, isopulegol, from the cyclisation of citronellal. The use of this kind of materials appears to be a good option over homogeneous catalysts, because they offer the advantage of recovery and, consequently, contribute to environmentally friendly processes.
Synthesis and spectroscopic characterisation of n-alkyl quaternary ammonium sal...
Pardal, Ana Cristina; Ramos, S.S.; Santos, P. F.; Reis, L. V.; Almeida, P.The synthesis and spectroscopic characterisation of some representative N-alkylsubstituted quaternary ammonium salts derived from benzothiazole, benzoxazole, benzoselenazole, indole and quinoline are described. These heterocyclic salts, bearing an activated methyl group in the 2-position in relation to the nitrogen atom and N-methyl, -pentyl, -hexyl and -decyl chains, are typical precursors of cyanine dyes.
Synthesis and spectroscopic characterisation of n-alkyl quaternary ammonium sal...
Pardal, Ana Cristina; Ramos, S.S.; Santos, P. F.; Reis, L. V.; Almeida, P.The synthesis and spectroscopic characterisation of some representative N-alkylsubstituted quaternary ammonium salts derived from benzothiazole, benzoxazole, benzoselenazole, indole and quinoline are described. These heterocyclic salts, bearing an activated methyl group in the 2-position in relation to the nitrogen atom and N-methyl, -pentyl, -hexyl and -decyl chains, are typical precursors of cyanine dyes.
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