CHEM 2332H Lecture 12: Lecture 1242014.pdf
15 Jul 2014
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-> more substituted alkenes are more stable than less substituted alkenes. Heat of hydrogenation"s not the sum of individual heats -->it"s less (4. 0 kcals off)" But the resonance structure doesn"t look like a good contributor (breaks all rules) Use atomic orbitals and combine them in linear fashion to build up mo. Ex: use butadiene each is sp2, 1 unused p orbital. + and - don"t correspond to charge -->corresponds to phase. Mismatch: antibonding (if all bonds and all antibonds fill up, there is no bond) If it skips (not close enough): non-bonding (this is the line bonding crosses to turn into antibonding) Bonding and antibonding are same distance from nonbonding line. Fill up the orbitals using pauli exclusion principle and hund"s rule. Bonding and antibondng exist at same time, but here, only fill bonding b/c fills up lowest energy orbitals. Wrong b/c can only break octet rule down, not up (can"t have too many electrons)
