Base Strength-Reactivity Effects in Polyethylenimine Esterolysis Reaction
Base Strength-Reactivity Effects in Polyethylenimine Esterolysis Reaction
Lege, Curtis Stanley
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Plot of E vs. pK or [a] for the esterolysis of (A)PNPC and (o) PNPA by PEI-D-NH 2 ~HC1 . 42 Equation II-8 log k a -E = 6 p pK a + C p P = polymer system - log k R = 3 R pK a + C R R = reference system log E - B pK + C^ E = polymeric enhancement E 1 - a E reference amines with PNPA is used to dissect the rates of the PEI-D-NH 2 -HC1 reaction with PNPC. In the case of the PNPC aminolysis the dependence of rate on pK is not a , app entirely resolved by the subtraction of the reference equation as ...in the case of PNPA. The caproate ester and acetate ester aminolyses must proceed by the same mechanism since the only structural change is replacement of a methyl group by a n-pentyl group. Although this change would not be expected to effect the reaction mechanism, the hydrophobic binding properties are greatly affected. Increased hydro- phobic binding with reduced charge density then, must be the explanation for the additional pH dependence in the case of PNPC reaction. The above discussion adequately accounts for the pH dependencies of the reactions of both PNPA and PNPC with PEI-D~NH 2 -HC1.
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