Addition of dichlorocarbene to 1,4,5,8-tetra-methoxynaphthalene (I) and the tetramethylpurpurogallin (IV) affords the benzocyclo-octatrienediones (III) and (VI) together with the bishomonaphthalene (II) and the benzobishomotropone (V), respectively.
J. Tsunetsugu, M. Sato and S. Ebine, J. Chem. Soc., Chem. Commun., 1973, 363 DOI: 10.1039/C39730000363
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