CHEM 213 Lecture Notes - Lecture 7: Markovnikov'S Rule, Alkene, Concerted Reaction
10 Feb 2017
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Document Summary
Ultraviolet-visible spectroscopy: shows conjugation, lambda max = wavelength at the maximum absorbance, can"t use wavelength to determine molecule, because many molecules have the same lambda max. But, can give you information about conjugation: highly conjugated molecules are more stable. Beer"s law a=e*c*l: a = absorbance, c = concentration, e = extinction coef cient/molar absorptivity, l = path length. Homo and lumo: further homo and lumo are from one another, the more stable it is. Analytical uses of uv-vis spectroscopy: uv-vis can be used in the structure elucidation to indicate whether coujugation is present, uv-v is involved with determine the concentration of unknown sample. Electrophilic attack on conjugated dienes: 1,4-addition: there is resonance, if the intermediates have resonance, this means we have a mixture as our product, mechanism. Hcl and the double bond from the 1,4-diene reaches out and bonds with the h from hcl.
