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- W2912166932 abstract "Abstract Current methodologies for the direct reductive coupling of two aldehydes to alkenes afford almost exclusively the thermodynamically favoured E ‐isomer. Recent efforts to find phosphorus‐based reagents as replacements for the low‐valent Ti species in McMurry couplings present opportunities to change this shortcoming, and to design new reagents that allow for the formation of high proportions of Z ‐alkenes under kinetic control. Here, we report the first example of such a reagent, a phosphanyl phosphonate Mes F P(H)P(O)(OEt) 2 , 6 , with an electron‐deficient Mes F =2,4,6‐(CF 3 ) 3 Ph substituent that promotes the reductive homo‐coupling of (hetero)aromatic aldehydes to alkenes with high Z ‐selectivity. Computational results indicate that the selectivity stems from the electron deficient Mes F , which results in lowered activation barriers for the collapse of a cis‐oxaphosphetane intermediate. In the absence of Mes F , the E ‐isomer is exclusively observed experimentally. Directing the isomeric outcome of alkene formation by introducing electron withdrawing P‐substituents bears resemblance to the Still‐Gennari modification of the Horner‐Wadsworth‐Emmons reaction where perfluorinated ethoxy substituents in the former also lead to high proportions of the Z ‐isomer." @default.
- W2912166932 created "2019-02-21" @default.
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- W2912166932 date "2022-05-31" @default.
- W2912166932 modified "2023-09-27" @default.
- W2912166932 title "<i>Z</i> ‐Selective Alkene Formation from Reductive Aldehyde Homo‐Couplings" @default.
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- W2912166932 doi "https://doi.org/10.1002/ejoc.202200365" @default.
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