CHARACTERIZATION OF REACTIVE INTERMEDIATES BY MULTINUCLEAR DIFFUSION-ORDERED NMR SPECTROSCOPY (DOSY) BY DEYU LI B. S., BEIJING MEDICAL UNIVERSITY, 1996 M. S., CHINESE ACADEMY OF MEDICAL SCIENCES, 1999 A DISSERTATION SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE DEPARTMENT OF CHEMISTRY AT BROWN UNIVERSITY PROVIDENCE, RHODE ISLAND MAY 2009