Các link có thể tìm thấy đề thi nước ngoài

http://web.chem.ucla.edu/~harding/cfqpp/ http://www.mpcfaculty.net/ron_rinehart/12A/chp10pag.htm http://www.chem.ucalgary.ca/courses/350/Carey/Ch10/ch10-0.html http://www.chem.ox.ac.uk/it_lectures/poznan/default.html http://www.chem.ox.ac.uk/it_lectures/poznan/slide13.html

http://chemistry.ucsc.edu/teaching/Winter02/Chem112B/20lecture.html

http://journals.iucr.org/c/issues/1997/04/00/na1268/na1268.pdf http://www.infochembio.ethz.ch/links/en/orgchem_reaktionen_lehr.html http://www.rod.beavon.clara.net/chemistry_contents.htm www-users.york.ac.uk http://www.chm.colostate.edu/course_info.html http://education.llnl.gov/msds/orgchem/Chem227/227assign-05.html