Conclusions
In contrast to certain o-benzoquinones, the sterically hindered o-quinones react with CH2N2 both at the oxygen atoms to give cyclic ethers, and at the C=C and C=O bonds of the quinoid ring; the predominant direction of the reaction depends on the ratio of the reactants.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2360–2362, October, 1981.
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Komissarova, N.L., Belostotskaya, I.S., Vol'eva, V.B. et al. Reaction of sterically hindered o-benzoquinones with diazomethane. Russ Chem Bull 30, 1944–1946 (1981). https://doi.org/10.1007/BF00963430
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DOI: https://doi.org/10.1007/BF00963430