Abstract
1,2-Addition of transient W(CO)5-complexed phosphinidenes exo to hexamethyl Dewar benzene affords the novel 3-phosphatricyclo[3.2.0.02,4]hept-6-ene complexes. The fused tricyclic phosphiranes are obtained as both the Z and the thermally less stable E isomers, the 31P NMR chemical shifts of which differ by about 60 ppm. A computational investigation shows that the
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