A solvent-free approach is described for the regioselective synthesis of acylals (1,1-diacetates) in shorter reaction times and higher yields, compared to conventional methodology using solvents. In the protection reaction of the o-hydroxybenzaldehyde the formation of acetyl compounds and anhydro-dimers was observed. The deprotection reaction involves microwave (MW) exposure of diluted reactants in the presence of solid sulphated zirconia (SZ) catalyst that can be easily recovered and reused. The sulphated zirconia was recycled several times without any loss of activity.
The corrosion inhibition efficiency of the new heterocycles is investigated on steel grade API 5L X52 in 1M HCl employing electrochemical impedance spectroscopy. -(CRUZ-GONZALEZ, D. Y.; GONZALEZ-OLVERA, R.; NEGRON-SILVA*, G. E.; LOMAS-ROMERO, L.; GUTIERREZ-CARRILLO, A.; PALOMAR-PARDAVE, M. E.; ROMERO-ROMO, M. A.; SANTILLAN, R.; URUCHURTU, J.; Synthesis 46 (2014) 9, 1217-1223, http://dx.
This work reports on the studies carried out with adenine, guanine and their corresponding nucleosides as adequate corrosion inhibitor candidates for steel API 5L X52 in 1M HCl. Electrochemical impedance spectroscopy served to perform corrosion testing varying the compounds' concentrations from 5 to 200 volume ppm. A relation was obtained between inhibiting compound candidate concentration and the overall corrosion inhibition efficiency, where 25 ppm appeared as the optimum concentration for all electrochemical systems tested.
The results are presented of the hydrotalcites-catalyzed, microwave-assisted synthesis of 2-BZMBI as a corrosion inhibitor candidate of API 5L X52 steel in 1M HCl. Using potentiodynamic polarization an analysis was made to establish the optimum concentration, from 5 to 200 ppm of 2-BZMBI, that gave the best result in terms of corrosion inhibiting efficiency, IE. Also, the kinetics of the inhibition process was studied through increasing the steel's exposure time to the 1M HCl medium with 30 and 200 ppm of the compound to evaluate its performance at prolonged times, which permitted to establish that the steel displayed good resistance with time.
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