Complexes of Gilman reagents with C-S and C-N double bonds: sigma or pi bonding?
Upon rapid injection, a variety of thiocarbonyl compounds react with the Gilman reagent Me(2)CuLi at -100 degrees C inside the probe of an NMR spectrometer to give high yields of complexes. Typical examples of substrates include carbon disulfide, methyl dithioacetate, methyl dithiobenzoate, thiobenzophenone, ethylene trithiocarbonate, and phenyl isothiocyanate. Evidence suggesting the formal oxidation state of copper in these complexes to be Cu(III) is presented. The last example was particularly interesting, since it involved a transient intermediate that was identified as a complex with a C-N double bond. Methyl isothiocyanate gave a stable C-N double-bond complex.
Bertz
Steven H
SH
Department of Chemistry, University of North Carolina-Charlotte, Charlotte, North Carolina 28223, USA. sbertz1@uncc.edu
Moazami
Yasamin
Y
Murphy
Michael D
MD
Ogle
Craig A
CA
Richter
Joshua D
JD
Thomas
Andy A
AA