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In general, in the field of [2 + 2] photoaddition of enones, the term head-to-head means the relative position between an alkyl group of an alkene and the carbonyl group of the enone. In this paper, we define it as the relative position between the ethoxy group of the alkene and a substituent at the double bond of the homoquinone since there are two carbonyl groups.
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The calculations using the PM3 method were performed with the MOPAC program using a CS MOPAC Pro software (ver 4.0).
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