10 - CH 310M/318M Lecture 6 M 2/1/2010 Reading Assignment:...

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CH 310M/318M – Lecture 6 – M 2/1/2010 Reading Assignment : Section 1.3 Graded Homework : HW#02 deadline = 5:00 p.m. on Tue 2/2 HW#03 deadline = 9:00 a.m. on Fri 2/5 Textbook Problems : 1.15, 1.56-1.59, 1.71-1.73 Last Time : Polar and nonpolar molecules Resonance Today : If you have an excusable conflict for ANY of the three midterm exams, the deadline to sign up to take a conflict exam is 5:00 p.m. on Friday, February 5 . Planning on taking Organic II??? An information session about the Summer 2010 “Organic Chemistry in Spain” program will be held THURSDAY, 2/4 @ 5:00 p.m. in WCH 1.108 Resonance (continued…) Valence bond theory and hybrid orbitals
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2 electron pairs are delocalized via resonance if you see a 3 atom fragment within a molecule that has a negative charge at one end and a multiple bond between the other two atoms!!! C C H H H O O C C H H H O O Another example : Draw the structure of the allyl cation, [CH 2 CHCH 2 ] + Valence e Number x C 4 3 = 12 H 1 5 = 5 –1 SUBTRACT 1 e for positive charge 16 e total H H H H H C C C H H H H H C C C 2 e left 1 electron pair is delocalized via resonance if you see a 3 atom fragment within a molecule that has a positive charge [NON-OCTET ATOM!] at one end and a multiple bond between the other 2 atoms!!! 0 e
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10 - CH 310M/318M Lecture 6 M 2/1/2010 Reading Assignment:...

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