A novel and very short synthesis of the useful title hydrocarbon 2 is presented. Its key step is based on a Diels-Alder reaction of isobenzofuran 4. The lithium salt of 2 gives a remarkably stable valenceisomer of anthracene 1 in a reaction analogous to the indene → benzobenzvalene transformation.
On the mechanism of the thermal naphthalene automerization, a comment
作者:Ulrich Burger、Jiri Mareda
DOI:10.1016/s0040-4039(00)99833-2
日期:1984.1
The title reaction is suggested to proceed by a reversible valence isomerization via a laterally bridge benzvalene (2). No analogous behaviour is expected for pyrene.