Peer-Reviewed Journal Details
Mandatory Fields
Storey C.M.;Kalpokas A.;Gyton M.R.;Krämer T.;Chaplin A.B.
2020
February
Chemical Science
A shape changing tandem Rh(CNC) catalyst: Preparation of bicyclo[4.2.0]octa-1,5,7-trienes from terminal aryl alkynes
Published
11 ()
Optional Fields
11
8
2051
2057
This journal is © The Royal Society of Chemistry. The preparation of a range of tetraaryl-substituted bicyclo[4.2.0]octa-1,5,7-trienes using a one-pot procedure starting from terminal aryl alkynes and catalysed by a rhodium(i) complex is reported. This synthesis proceeds by a reaction sequence involving head-to-tail homocoupling of the terminal alkyne and zipper annulation of the resulting gem-enyne. The rhodium catalyst employed is notable for the incorporation of a flexible NHC-based pincer ligand, which is suggested to interconvert between mer- and fac-coordination modes to fulfil the orthogonal mechanistic demands of the two transformations. Evidence for this interesting auto-tandem action of the catalyst is provided by reactions of the precatalyst with model substrates, corroborating proposed intermediates in both component cycles, and norbornadiene, which reversibly captures the change in pincer ligand coordination mode, along with a DFT-based computational analysis.
2041-6520
10.1039/c9sc06153c
Grant Details