A oligomerização do glicerol catalisada por ácido foi investigada por espectrometria de massas com ionização electrospray, em modo de íon positivo, i.e. ESI(+)-MS. Os dados de ESI(+)-MS revelaram que a 280 °C e em meio ácido (pH 2), glicerol sofre sucessivas condensações intermoleculares para produzir espécieis oligoméricas, i.e. [(glicerol) n-(n-1) H 2 O] (n = 2-5). Esses resultados de ESI(+)-MS, em associação com as informações obtidas por análises de infravermelho e RMN de 1 H e 13 C, indicaram que esses oligômeros sofrem desidratações para formar uma mistura de produtos, composta principalmente por compostos cíclicos, assim como alquenos e derivados carbonílicos (aldeídos e cetonas). Acid-catalyzed oligomerization of glycerol was investigated by direct infusion electrospray ionization mass spectrometry in the positive ion mode, i.e. ESI(+)-MS. The ESI(+)-MS data revealed that at 280 o C and in acidic medium (pH 2), glycerol undergoes successive intermolecular condensations to produce oligomeric species, i.e. [(glycerol) n-(n-1) H 2 O] (n = 2-5). These ESI(+)-MS data, in association with the information provided by IR, 1 H and 13 C NMR analyses, indicated that these oligomers undergo intramolecular dehydrations to form miscellaneous products comprised mainly by cyclic compounds as well as alkenes and carbonylic derivatives (aldehydes and ketones).
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