Lecture, one hour; laboratory, six hours. Enforced requisites: courses 14B and 14BL, or 20B and 20L, with grades of C- or better. Enforced corequisite: course 14C. Synthesis and analysis of compounds; purification by extraction, chromatography, recrystallization, and sublimation; characterization by mass spectroscopy, UV, NMR, and IR spectroscopy, optical activity, electrochemistry, pH titration. P/NP or letter grading.