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Isomerization of a cis ‐(2‐Borylalkenyl)Gold Complex via a Retro‐1,2‐Metalate Shift: Cleavage of a C−C/C−Si Bond trans to a C−Au Bond
Author(s) -
Suzuki Akane,
Wu Linlin,
Lin Zhenyang,
Yamashita Makoto
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202108530
Subject(s) - isomerization , chemistry , regioselectivity , alkyne , natural bond orbital , carbon atom , hydrocarbon , stereochemistry , computational chemistry , catalysis , density functional theory , ring (chemistry) , organic chemistry
This manuscript describes the first example of an alkyne insertion to the Au−B bond of a di( o ‐tolyl)borylgold complex to afford a cis ‐2‐borylalkenylgold complex, and its isomerization to result in interchanging substituents on the alkenyl carbon atom and the boron atom. The former reaction is the first example of an alkyne insertion to a Au−B bond. In the latter reaction, the regiochemistry of the isomerized alkenylgold products varied depending on the substituents. DFT calculations revealed the formation of gold alkynylborates as a common intermediate via a “retro‐1,2‐metalate shift”, which can be considered as an anti ‐ β ‐carbon/silicon elimination, and identified a subsequent 1,2‐metalate shift as the regiochemistry‐determining step. Relative energies of the transition states to each isomer and natural‐bond‐orbital (NBO) analyses were used to clearly rationalize the regiochemistry of the products.