Reactions of methylene with hexamethyl(Dewar benzene)
作者:Sean D. Reilly、Carl C. Wamser
DOI:10.1021/jo00017a048
日期:1991.8
Fused Tricyclic Phosphiranes—Analysis of Phosphorus Chemical Shieldings
作者:Erik P. A. Couzijn、Andreas W. Ehlers、J. Chris Slootweg、Marius Schakel、Steffen Krill、Martin Lutz、Anthony L. Spek、Koop Lammertsma
DOI:10.1002/chem.200700958
日期:2008.2.8
hexamethyl Dewar benzene affords the novel 3-phosphatricyclo[3.2.0.0(2,4)]hept-6-ene complexes. The fusedtricyclicphosphiranes are obtained as both the Z and the thermally less stable E isomers, the (31)P NMR chemical shifts of which differ by about 60 ppm. A computational investigation shows that the phosphorus pyramidalization and the presence of the gamma double bond are responsible for this effect. The