case of cyano-substituted mesitaldehydes has permitted directobservation, for the first time, of the E-enols en route to benzocyclobutenols. The AM1 calculations suggest that the cyano-substitution causes intrinsic stabilization of the E-enols relative to the corresponding cyclobutenols, while the bromo groups do the opposite. The lack of observation of the red color in bromo- and formyl-substituted aldehydes
[EN] STABLE PLY(IMIDAZOLIUM) HYDROXIDES<br/>[FR] HYDROXYDES STABLES DE PLY(IMIDAZOLIUM)
申请人:UNIV FRASER SIMON
公开号:WO2018023097A1
公开(公告)日:2018-02-01
Provided herein are imidazolium polymers having steric hindrance at the 4-position of the imidazole moieties in the polymeric chain. The sterically-protected, N-methylated imidazolium polymers exhibit hydroxide stability in concentrated caustic solutions at elevated temperatures, such as at 100 °C and higher.
[EN] STABLE POLY(IMIDAZOLIUM) HYDROXIDES<br/>[FR] HYDROXYDES STABLES DE PLY(IMIDAZOLIUM)