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  • Title: Photocatalytic Generation of π-Allyltitanium Complexes via Radical Intermediates.
    Author: Li F, Lin S, Chen Y, Shi C, Yan H, Li C, Wu C, Lin L, Duan C, Shi L.
    Journal: Angew Chem Int Ed Engl; 2021 Jan 18; 60(3):1561-1566. PubMed ID: 33009696.
    Abstract:
    The addition of π-allylmetal complexes to carbonyls is the most important route to homoallylic alcohols. This study reports the first photocatalytic generation of π-allyltitanium complexes by a radical strategy. This novel strategy enables the three-component allylation of carbonyls with 1,3-butadiene, providing rapid access to valuable homoallylic alcohols (over 60 examples). The exceptional regio- and diastereoselectivity provided by dual photoredox/Ti catalysis is comparable to that of the Cr-catalyzed Nozaki-Hiyama-Kishi allylation reaction.
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