Ch1b09Lecture21

Ch1b09Lecture21 - 1 Lecture 21 - February 26, 2009 Summary...

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Summary of last lecture: •nucleophilic displacement reactions: S N 2 and S N 1 mechanisms •optical activity Preview of coming attractions: Lecture 21 - February 26, 2009 1 •demonstrations (S N 1 and optical activity) •displacement reactions and drug design •photochemistry of vision
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Displacement reaction of 2-chloro-2-methylpropane fit S N 1 reaction velocity to general equation: velocity = " d RCl [ ] dt = + d ROH [ ] dt = k RCl [ ] [ RCl ] = [ RCl ] 0 e " kt 2 CH 3 C CH 3 CH 3 Cl + OH - CH 3 C CH 3 CH 3 OH + Cl - if [RCl] 0 is in excess of [OH - ] 0 , the time t to consume all the OH - = t ' = " 1 k ln 1 " OH " [ ] 0 [ RCl ] 0 # $ % % ( (
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t =time to consume OH - (RCl) 0 = 0.04 M 3 t ' = " 1 k ln 1 " OH " [ ] 0 [ RCl ] 0 # $ % % ( ( k ~ 0.01 sec -1 ; t 1/2 = ln2/k ~ 70 sec
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The color of the transmitted light varies with rotation angle - why? fructose absorbs in the ultraviolet region •for smaller α , red light is absorbed by the crossed polarizers and blue is transmitted •for larger α , blue light is absorbed by the crossed polarizers and red is transmitted 4 UV blue red O OH CH 2 OH HOCH 2 OH HO fructose
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Ch1b09Lecture21 - 1 Lecture 21 - February 26, 2009 Summary...

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