CHM136H1 Lecture Notes - Lecture 32: Aromaticity, Lone Pair, Pyrrole

• School: UTSG
• Department: Chemistry
• Course: CHM136H1

Document Summary

For spectroscopy, it"s important to know what results indicate. Heterocycle: cyclic compound that comprises atoms of two or more elements in its ring. Aromatic compounds can have elements other than carbon in the ring. Six-membered heterocycle with n in its ring (like benzene but 5 carbons) Nitrogen lone pair electrons are not part of the aromatic system (perpendicular orbital) Pyridine is relatively weak base compared to normal amines but protonation doesn"t affect aromaticity in this compoudn. Aromatic compound because the lone pairs are along plane as if it were a h. Like pyridine but another c is replaced with n. Pyrrole - lone pair on n is part of aromatic system and is not a bronsted base. Imidazole - line pair on n is part of aromatic system and other is orthogonal and is a bronsted base. Pyrimidine is the parent ring system present in cytosine, thymine, and uracil. There are large applications of these molecules in biology.