An efficient preparation and spectroscopic and electrochemical properties of quinodimethane derivatives with four 3-(methoxycarbonyl)azulen-1-yl groups
摘要:
Reaction of methyl 1-azuienecarboxylate (8) with terephthalaldehyde (9) in acetic acid in the presence of hydrochloric acid at 25 degrees C for 2 It 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 degrees C for I 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 T for I h yields the target quinodi-methane 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. (c) 2008 Elsevier Ltd. All fights reserved.
An efficient preparation and spectroscopic and electrochemical properties of quinodimethane derivatives with four 3-(methoxycarbonyl)azulen-1-yl groups
摘要:
Reaction of methyl 1-azuienecarboxylate (8) with terephthalaldehyde (9) in acetic acid in the presence of hydrochloric acid at 25 degrees C for 2 It 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 degrees C for I 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 T for I h yields the target quinodi-methane 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. (c) 2008 Elsevier Ltd. All fights reserved.
An efficient preparation and spectroscopic and electrochemical properties of quinodimethane derivatives with four 3-(methoxycarbonyl)azulen-1-yl groups
Reaction of methyl 1-azuienecarboxylate (8) with terephthalaldehyde (9) in acetic acid in the presence of hydrochloric acid at 25 degrees C for 2 It 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 degrees C for I 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 T for I h yields the target quinodi-methane 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. (c) 2008 Elsevier Ltd. All fights reserved.