W2013CHM2311 Part 5 Notes

Hmo theory applica0on to aroma0city an0aroma0city the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: are higher in energy than the chain fragments, the ring is an9aroma9c. Benzene: An Aroma;c Ring H H H C H H C H C C C C H C C C C C H H H C H H Resonance Descrip;on →  All atoms are in the same plane →  The MO diagram for benzene’s π- system consists of six unhybridized p- orbitals (one on each carbon atom) connected in a ring. →  Recall that an allyl group consists of three unhybridized p- orbitals. →  Can develop an MO descrip0on of benzene’s π- system by combining the π- systems of two allyl fragments. HMO Treatment of Allylic Species Propylene: a linear 3- carbon π- system The lowest orbital is π- bonding. The next orbital is a nonbonding MO with one node that bisects the molecules ↳  i.e., the node passes through the central C atom and eliminates interac0on with the central carbon p- orbital. The highest orbital is a π* (an0bonding combina0on) with two nodes. An;bonding Nonbonding or em pty Bonding perpendicular views Benzene π- MO Diagram: Combina0on of Two Allyl Fragments TOP VIEW OF ALLYL FRAGMENT TOP VIEW OF ALLYL FRAGMENT Ψ6 S S e n er g y Ψ4 ...
View Full Document

This note was uploaded on 03/28/2014 for the course CHM 2311 taught by Professor Richardson during the Winter '09 term at University of Ottawa.

Ask a homework question - tutors are online