The hetero Diels-Alder reaction between benzaldehyde and a functionalized diene can be catalyzed by the Lewis acid transition metal complexes, [CpRuLL′(CH2CH2)]PF6 (L L′ PPh3, or LL′ = 1,2-bis-diphenylphosphinoethane, (−)-DIOP or (S,S)-CHIRAPHOS).
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Faller et al. (1989) studied this question.
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