Discovery of 2,4-Dimethylpyridine

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Cyclic meta-sulfonium-phenoxide zwitterions

New, highly reactive, polymerizable compounds are described, corresponding to the formula STR1 wherein R is H or lower alkyl, Z is a linking entity which is a chemical bond, lower alkylene, lower alkylenedioxy, O or the like, m is an integer 2-3 and n is 0-10. They are prepared by reaction of the corresponding 3(methylthio)phenolic compounds with the appropriate 1,4- or 1,5-alkylene bromide and converting the resulting cyclic sulfonium bromide to the zwitterion by treatment with a strong base anion-exchange resin in hydroxide form. They polymerize in a few minutes at 30-50 C. to form polymers useful as coatings.

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Reference£º
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis