55143-87-8Relevant articles and documents
An alternative method to access diverse N,N′-diquaternised-3,3′-biquinoxalinium “biquinoxen” dications
Leblanc, Nicolas,Sproules, Stephen,Powell, Annie K.
supporting information, p. 2949 - 2954 (2017/04/14)
An alternative synthetic route for the design of N,N′-diquaternised-3,3′-biquinoxalinium “biquinoxen” dications is reported, involving oxidative radical coupling of dithionite reduced quinoxaline quaternary salts. Although the reaction is not regioselective, leading to relatively modest yields (up to 32%), the advantages of this new synthetic protocol lie in a simple potentially gram scale synthesis using inexpensive easily accessible reagents with no metal catalysts and no purification steps. Thus whereas the method reported previously to access the N,N′-dimethyl-3,3′-biquinoxalinium, “methylbiquinoxen” precursor gave higher yield than the new method reported here, this new method avoids the limitation of using scarce oxonium reagents. Overall, the new protocol is a robust synthetic strategy which offers new design possibilities.
REACTION OF AZINIUM CATIONS.5.* ADDITION OF WATER AND METHANOL TO 1,4-DIAZINIUM CATIONS IN THE PRESENCE OF BASES. EQUILIBRIUM CONSTANTS AND PMR SPECTRA OF THE MONO- AND DIADDUCTS
Charushin, V. N.,Kazantseva, I. V.,Ponizovskii, M. G.,Egorova, L.G.,Sidorov, E.O.,Chupakhin, O. N.
, p. 1118 - 1125 (2007/10/02)
The PKR* values and equilibrium constants for the addition of hydroxide ions to 1,4-diazinium ions were determined by spectrophotometry.The ratios 1:1 and 1:2 of the methoxyl adducts of the 1,4-diazinium ions in the sodium methoxide-methanol-D4 system and the equilibrium constants for the transformations of the monoadducts into the diaddition products were determined by PMR spectroscopy.
