Catalysis by stearyltrimethylammonium bromide of the reaction between long chain alkanethiols and p-nitrophenyl acetate

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Abstract
The effect of stearyltrimethylammonium bromide (stab) upon the reaction between alkanethiols and p-nitrophenyl acetate has been examined in aqueous solution; below the critical micellar concentration (c.m.c.) of stab, the activities of thiols decrease with increasing carbon chain length, whereas, above the c.m.c., dodecanethiol is some 104 fold more reactive than in the absence of stab at pH 9.