# Inside Cover: Synergistic N‐Heterocyclic Carbene/Palladium‐Catalyzed Umpolung 1,4‐Addition of Aryl Iodides to Enals (Angew. Chem. Int. Ed. 1/2020)

“Inside Cover: Synergistic N‐Heterocyclic Carbene/Palladium‐Catalyzed Umpolung 1,4‐Addition of Aryl Iodides to Enals (Angew. Chem. Int. Ed. 1/2020)” (2019), by Wenjun Yang et al. Chemistry research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Wenjun Yang, Bo Ling, Bowen Hu, Haolin Yin, Jianyou Mao, Patrick J. Walsh
- Published: November 27, 2019
- Field: Chemistry
- DOI: https://doi.org/10.1002/anie.201914768
- Source: https://doi.org/10.1002/anie.201914768

## Abstract

N-Heterocyclic carbene (NHC) organocatalysis in the presence of transition metals is a challenge because of the high affinity of NHCs for metals. In their Communication on page 161, J. Mao, P. J. Walsh, and co-workers present a system for the conjugate addition of aryl iodides to enals through cooperative catalysis between an NHC and a Pd catalyst. The catalytic cycles intersect at Pd, where the two newly formed Pd−C bonds undergo reductive elimination to give a C−C bond.

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