Cesar Filho and Alan Matsushita acknowledge nancial support from Conselho Nacional de Desenvolvimento Cient´ıco e Tecnol ´ogico (CNPq- Brazil) – Science without borders Program through the PhD grants (246079/2012-6 and 249241/2013-7, respectively). We are indebted to Professor S´ergio Seixas de Melo for his support for the HPLC measurements. This work was funded by the Coimbra Chemistry Centre, which is supported by the Fundaç˜ao para a Ciˆencia e a Tecnologia (FCT) through the programmes UID/QUI/UI0313/2013 and COMPETE, and by Portuguese funds through FCT in the framework of the project WaterJPI/0006/2016. Access to TAIL-UC facility funded under QREN-Mais Centro Project ICT/2009/02/012/1890 is gratefully acknowledged. NMR data was collected at the UCNMR facility which is supported in part by FEDER – European Regional Development Fund through the COMPETE Programme (Operational Programme for Competitiveness) and by National Funds through FCT -Fundaç˜ao para a Ciˆencia e a Tecnologia and Rede Nacional de Ressonˆancia Magn´etica Nuclear (RNRMN).