Overcoming the ortho/para rule? The regioselectivity of Diels–Alder reactions with neutral electron demand between 1,3-dienes with alkynes can be controlled by simple cobalt diimine complexes so that the meta-substituted cycloadducts are generated in good yields and excellent regioselectivity (see scheme; DDQ=2,3-dichloro-5,6-dicyano-1,4-benzoquinone).
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Hilt et al. (2006) studied this question.
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