Abstract
The photochemical coupling reaction between 2,3-dihydrofuran and benzaldehyde was studied by using DFT/B3LYP/6-31G+(d,p) method. The regiochemistry of the attack of the benzaldehyde on the double bond is related to the different stability of the biradical intermediates. The endo stereoselectivity of the product depends on the superposition between HSOMO and LSOMO in the biradical intermediate. The photochemical reaction between furan and benzaldehyde was studied at the same level. The regioselectivity depends on the relative stability of the possible biradical intermediates. The exo stereoselectivity of the coupling product depends on the superposition between the HSOMO and LSOMO of the biradical intermediate.
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