215-216 HH-W10 Quiz 4-key - Chem 215-216 HH W10 Quiz 4(this...

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Chem 215-216 HH W10 February 5, 2010 Quiz 4 (this quiz has two pages) [ total 22 points ] Name:_____ Key __________________ Lab Section: Mon; Tue AM; Tue PM; Wed (circle one that applies); GSI _____________________ 1. ( 14 points) (1) Draw in the boxes below the structures of the corresponding products. (2) Draw a picture of the HOMO or LUMO of the diene to be used for an explanation of the stereochemical outcome for the thermal ring closing reaction in (1) (using 2p-orbitals). Indicate all of the nodal points (not including those at atom nuclei) and the signs of all contributing atomic orbitals and show the direction of the movement (or rotation) of the two terminal 2p orbitals. (1) h ! " 3 H H 1 2 3 4 H H 1 2 3 3 4 (2) For the thermal ring closure above: The HOMO or LUMO of the diene should
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