All NMR spectra were recorded at 25 ± 0.1 ◦C, using 5-mm tubes (seven inches in length), on an Avance 300 Ultrashielded Spectrometer (Bruker Biospin, Milano, Italy), equipped with a BB0 probe and a temperature control unit. One-dimensional 1H- and 13C-NMR spectra were recorded at...