Wykład 4
http://www.joe-harrity.staff.shef.ac.uk/meetings/Hard_Soft.ppt
http://faculty.uml.edu/ndeluca/84.334/topics/Hard-Soft%20Acid-Base%20Theory.ppt
http://www.chemvista.org/hardsoftacidsbases.html
http://www.meta-synthesis.com/webbook/43_hsab/HSAB.html
http://www.thecatalyst.org/experiments/Kaur/Kaur.html
http://pharmaxchange.info/press/2011/04/phenolates-o-alkylation-and-c-alkylation/