J. Barluenga et al., Unexpected thermal benzannulation of 1,3,5-metallahexatrienes: Synthesis of o-alkoxyphenol-containing polycycles, ORG LETT, 1(4), 1999, pp. 541-543
[GRAPHICS]
A new synthesis of o-methoxyphenol-containing polycyclic systems is describ
ed. Cyclobutene-containing 1,3,5-metallahexatrienes, obtained by [2 + 2] cy
cloaddition of cyclic enol ethers and chromium or tungsten alkynyl carbene
complexes, undergo unexpected thermal benzannulation to provide access to a
wide range of o-methoxy-substituted aromatic alcohols.