Consider the thermal reaction 1,3,5-hexatriene 1,3-cyclohexadiene. (a) Use the symmetry of the polyene HOMO to predict
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(a) Use the symmetry of the polyene HOMO to predict whether the reaction path is conrotatory or disrotatory. (The HMOs need not be found explicitly; all that is needed are the signs of the AOs in the HOMO, and these can be found from the pattern of nodes; the number of vertical nodal planes is zero for the ground state and increases by 1 for each higher state.)
(b) Do the same as in (a) when the reaction occurs photochemically.
(c) State the general rules for the cyclization of the polyene (17.28) with nπ π electrons.
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a CH2CHCHCHCHCH2 has 6 electrons so the HOMO is the third lowest and has two nodes not counting the ...View the full answer
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