Phase transfer catalysts
AssigneeGeneral Electric Company
InventorDaniel J. Brunelle
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Abstract
Branched alkyldiorganoaminopyridinium salts have been found useful as phase transfer catalysts for facilitating nucleophilic aromatic substitution. For example, the 2-ethylhexyl salts of dialkylaminopyridine, can be used as stable phase transfer catalysts for making aromatic etherimides by reacting substituted phthalimides and alkali metal phenoxides in the presence of a nonpolar organic solvent.
Claims4
A N-2-branched alkyldiorganoaminopyridinium salt of the formula, ##STR9## where R.sup.2 and R.sup.3 are monovalent or divalent organo radicals selected from C.sub.(1-13) hydrocarbon radicals and C.sub.(1-13) substituted hydrocarbon radicals and C.sub.(1-8) divalent alkylene radicals which together can be part of a cyclic structure forming a C.sub.(4-12) ring, R.sup.4 or R.sup.5 is a C.sub.(1-8) alkyl radical, while the sum of R.sup.4 and R.sup.5 is a total of C.sub.(2-18) carbon atoms.
N-2-ethylhexyldimethylaminopyridine chloride.
N-2-ethylhexyl-4-methylpiperidinylaminopyridine chloride.
N-2-ethylhexyldihexylaminopyridine chloride.
Dependencies are inferred from the claim text.