Reaction of 4,4-dimethoxycyclohexa-2,5-dienone with dimethylsulphoxonium methylide and subsequent hydrolysis gave exclusively syn-bishomoquinone. An attempted double addition of carbene to 3,3,6,6-tetramethoxycyclohexa-1,4-diene produced 1,4-dimethoxybenzene. 1,2,4-trimethoxybenzene, and 2,2′,4,5,5′-pentamethoxybiphenyl.
G. L. Buchanan, R. A. Raphael and R. Taylor, J. Chem. Soc., Perkin Trans. 1, 1973, 373 DOI: 10.1039/P19730000373
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