Cyclisation and decarboxylation in zwitterionic micelles: Effects of head group structure

The spontaneous decarboxylation of 6-nitrobenzisoxazole-3-carboxylate ion is strongly catalysed by micelles of zwitterionic surfactants, viz., sulfobetaines [C14H29N+R2(CH 2)3SO3-, R = Me, Pr and C 16H33N+Me2(CH2) 3SO3-] and amine oxides (C14H 29N+R2O-, R = Me, Pr), with rates enhanced by factors of up to 1800. These micelles and those of the corresponding carboxybetaines are more effective catalysts than those of the corresponding cationic surfactants. In all cases a change from Me to Pr at the head group speeds reaction by factors of ca. 5-8 for the sulfobetaines and amine oxides and ca. 14 for the cationic surfactants. Cyclizations of the o-3- halopropyloxyphenoxide ions (halogen = Br, I), which are intramolecular S N2 reactions, are modestly micellar catalysed, but structural effects on the micellar catalysis by cationic and betaine surfactants are in the same sequence, as for decarboxylation.