CHM 2211- Midterm Exam Guide - Comprehensive Notes for the exam ( 37 pages long!)
Document Summary
Aromatic ring c-h stretching at 3030 cm-1 and peaks 1450 to 1600 cm-1. Benzene carbon 13 nmr has a signal at 128 ppm. But if the carbon has two substituents: ortho three signals, meta four signals, para two signals. Conjugated compounds contain two double bonds separated by a single bond. Allyl carbocations are another example of conjugated compounds. A is more stable than b because it has no separation of charges. C is equally stable to d; both have a negative charge on the same atom (oxygen) Structure stability: a negative charge that is not on the most electronegative atom, a positive charge that is on an electronegative atom, separated charges. Conformation of conjugated dienes: s-cis conformation has two double bonds on the same side of the double bond, s-trans conformation as two double bonds on opposite sides of the double bond. Diels-alder reactions: rules: the diene can react only when it adopts the s-cis conformation (very reactive).
