A Facile Preparation, Characteristic Properties, and Crystal Structure of {4-[(<i>E</i>)-2-(3-Guaiazulenyl)diazenyl]phenyl}(3-guaiazulenyl)methylium Hexafluorophosphate
Reaction of 4-[(E)-2-(3-guaiazulenyl)diazenyl]benzene-1-carbaldehyde with guaiazulene (=7-isopropyl-1,4-dimethylazulene) in methanol in the presence of 65% hexafluorophosphoric acid at 25 °C for 2 ...