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- W2030183464 abstract "Reaction of methyl 1-azulenecarboxylate (8) with terephthalaldehyde (9) in acetic acid in the presence of hydrochloric acid at 25 °C for 2 h gives 1,4-bis[bis(3-methoxycarbonyl-1-azulenyl)methyl]benzene (12), in 93% yield, which upon oxidation with 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) in dichloromethane in the presence of hexafluorophosphoric acid at 25 °C for 1 h affords the dicarbenium-ion compound 15 in 94% yield. Furthermore, reduction of 15 with zinc powder in a mixed solvent of acetonitrile and chloroform at 25 °C for 1 h yields the target quinodimethane 18 in 90% yield. Similarly, as in the case of 18, the quinoid compounds 19 and 20 can be derived from the dicarbenium-ion compounds 16 and 17, quantitatively. A facile preparation as well as spectroscopic and electrochemical properties of 15–20 is reported." @default.
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- W2030183464 date "2008-04-01" @default.
- W2030183464 modified "2023-09-23" @default.
- W2030183464 title "An efficient preparation and spectroscopic and electrochemical properties of quinodimethane derivatives with four 3-(methoxycarbonyl)azulen-1-yl groups" @default.
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- W2030183464 doi "https://doi.org/10.1016/j.tet.2008.02.012" @default.
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