Trapping evidence for the thermal cyclization of di-(o-acetylphenyl)acetylene to 3,3'-dimethyl- 1,1'-biisobenzofuran

• Charles P. Casey,
• Neil A. Strotman and
• Ilia A. Guzei

Beilstein J. Org. Chem. 2005, 1, No. 18, doi:10.1186/1860-5397-1-18

• the transient production of A, the first biisobenzofuran. An X-ray crystal structure of meso-3 was obtained. As part of a recent study of the thermal cyclization of η2-(o-ethynylbenzoyl)rhenium complexes to rhenium isobenzofuryl carbene complexes (Scheme 1),[1] we attempted to form a rhenium complex

• data for all new compounds and X-ray crystallographic data for meso-3 (16 pages). X-ray crystallographic data for meso-3 has been deposited in the Cambridge Structural Database (CCDC # 289103). X-ray crystal structure of meso-3. Thermal cyclization of η2-(o-ethynylbenzoyl)rhenium complexes to rhenium