Kinetics and mechanism of transesterification of phenyl salicylate

1987 ◽  
Vol 19 (8) ◽  
pp. 757-776 ◽  
Author(s):  
M. Niyaz Khan
Keyword(s):  
Kinetics And Mechanism ◽  
Phenyl Salicylate

scholarly journals Kinetics and Mechanism of Nanoparticles-Catalyzed Piperidinolysis of Anionic Phenyl Salicylate

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Norazizah Abd. Razak ◽  
M. Niyaz Khan
Keyword(s):  
Rate Constants ◽  
Binding Constant ◽  
Cetyltrimethylammonium Bromide ◽  
Catalytic Effect ◽  
Binding Constants ◽  
Bulk Water ◽  
Kinetics And Mechanism ◽  
Water Phase ◽  
Phenyl Salicylate ◽  
Spherical Micelles

The values of the relative counterion (X) binding constantRXBr(=KX/KBr, whereKXandKBrrepresent cetyltrimethylammonium bromide, CTABr, micellar binding constants ofXv-(in non-spherical micelles),v=1,2, and Br−(in spherical micelles)) are 58, 68, 127, and 125 forXv−=1−, 12−, 2−, and22-, respectively. The values of 15 mM CTABr/[NavX] nanoparticles-catalyzed apparent second-order rate constants for piperidinolysis of ionized phenyl salicylate at 35°C are 0.417, 0.488, 0.926, and 0.891 M−1 s−1forNavX= Na1, Na21, Na2, and Na22, respectively. Almost entire catalytic effect of nanoparticles catalyst is due to the ability of nonreactive counterions,Xv-, to expel reactive counterions,3−, from nanoparticles to the bulk water phase.

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