SCHEDULED MAINTENANCE
The bis-(p-dimethylaminophenyl)methylenecycloproparenes (8) and (9) are polar compounds with dipole moments which lie in the opposite direction to that in the fluorenylidene analogue (2); the mesomerism present in (8) and (9) is removed upon quaternization of the nitrogen atoms.
B. Halton, Q. Lu and P. J. Stang, J. Chem. Soc., Chem. Commun., 1988, 879 DOI: 10.1039/C39880000879
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