Category Archives: Post-lecture

Internal Rotation & Hybrid Orbitals

Posted on September 14, 2009 by alan

Today's lecture on conformational isomers and internal rotation omitted a rather slick use of hybrid orbitals. Pictured above are two views of CH3 (methyl) with its singly occupied sp3 hybrid orbital on C (side view on left, orbital axis… Continue reading →

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Lecture slides – Wed Sept 8 (more MOs)

Posted on September 9, 2009 by alan

Slides for today's lecture are located here.Several of you came back with excellent questions after lecture today and I want to share some of this material with the rest of the class…. Continue reading →

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HW #1, Conference assignments, Study guide #2

Posted on September 8, 2009 by alan

I've been inundated with questions and comments about homework assignment #1, and requests for changes in conference assignments, so I wanted to bring you up to date on these and other items of interest…. Continue reading →

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Lecture slides – Fri Sept 4

Posted on September 4, 2009 by alan

Except for the computer troubles, I thought today's lecture went surprisingly well. Too bad that we didn't get through the entire set of slides, but I'll show them to you on Monday. Here is a copy of the slides from… Continue reading →

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Lecture slides – Wed Sept 2

Posted on September 2, 2009 by alan

You can download all of the slides (in color) from today's lecture here…. Continue reading →

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Lecture Moves to Psych 105

Posted on August 31, 2009 by alan

It was incredibly crowded in Eliot 314 this morning. So, even though I love the room (it's where I started teaching back in 1989), the sunlight, the traffic sounds from Eliot circle, the difficulty of seeing the white boards from… Continue reading →

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Cations, crowns, and phase transfer catalysts

Posted on December 9, 2008 by alan

The following images (click image for full-size view) show potential maps (0 –> +1500), ball-and-spoke formulas, and space-filling formulas of(CH3CH2CH2CH2)N+ (top left)PhCH2N(Et)3+ (top center)18-crown-6(K+) (right)Li+, Na+, K+ (bottom left) The potentials surrounding the organic cations are more moderate, but not… Continue reading →

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S/P electrophiles & crown ethers

Posted on December 5, 2008 by alan

The PowerPoint slides from today's lecture can be downloaded here. A couple of comments on each slide …… Continue reading →

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Huckel's rule, aromatic character, and molecular orbitals

Posted on November 26, 2008 by alan

Today's lecture tried to tie Huckel's rule to a number of topics, including:aromatic character, a more nuanced way of talking about aromaticitycharge distributions and geometryevaluation of "minor" resonance structuresmolecular orbital theoryYou can see all of the slides that were used… Continue reading →

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Models of Chemical Bonding

Posted on November 12, 2008 by alan

Today I decided to re-trace my steps on Monday and provide a more complete description of chemical bonds through the eyes of molecular orbital theory. A list of take-home lessons from this presentation:MO models contain new orbitals (molecular orbitals), while… Continue reading →

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