Ring expansion of 5-to 6-member zirconacycles by carbenoid insertion
Dixon, S., Fillery, S. M., Kasatkin, A., Norton, D., Thomas, E. and Whitby, R. J. (2004) Ring expansion of 5-to 6-member zirconacycles by carbenoid insertion. Tetrahedron, 60, (6), 1401-1416. (doi:10.1016/j.tet.2003.09.056).
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A wide range of carbenoids (1-lithio-1-halo species), including those with alpha-SiR3, OEt, SPh, SO2Ph, P(O)(OEt)(2), and CN substituents, insert into 5-member zirconacycles (saturated and unsaturated, mono- and bi-cyclic) to afford functionalized 6-member zirconacycles. 1-Lithio-1-haloalkenes insert to afford 6-member zirconacycles with an alkylidene substituent next to the metal. Unexpected double insertion of some carbenoids, and evidence for endocylic beta-hydride transfer processes provide additional mechanistic interest.
|Keywords:||zirconium, carbenoid, ring expansion, multi-component, zirconacycle, insertioncarbon bond formation, metal-promoted cyclization, zirconium-mediatedsynthesis, tandem insertion, lithium chloroallylide, diethyl1,2-epoxyalkanephosphonates, reductive cyclization, convergentsynthesis, grignard-reagents, organic-synthesis|
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||17 Feb 2006|
|Last Modified:||06 Aug 2015 02:19|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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