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Lipophilic sulfonic acids as the phase transfer catalysts in the hydrolysis of p-nitrophenyl acetate

✍ Scribed by Waichiro Tagaki; Noriko Iwamoto; Kenji Suzuki; Seizo Tamagaki

Book ID
104243579
Publisher
Elsevier Science
Year
1981
Tongue
French
Weight
168 KB
Volume
22
Category
Article
ISSN
0040-4039

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✦ Synopsis

Lipophilic dialkoxybenzenesulfonic acids effectively catalyze the acid-hydrolysis of p-nitrophenyl acetate in a benzene-H20 twophase system. Examination of the effects of varying the alkyl-chain length and catalyst concentration on the rate suggests the reaction involving some micellar aggregates of these catalysts in the organic phase.

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Histidine-containing cyclic dipeptides a
Histidine-containing cyclic dipeptides as catalysts in the hydrolysis of carbonic acid p-nitrophenyl esters
✍ Yukio Imanishi; Masao Tanihara; Toshiharu Sugihara; Toshinobu Higashimura πŸ“‚ Article πŸ“… 1977 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 677 KB

## Abstract A histidine‐containing cyclic dipeptide, cyclo(D‐Leu‐L‐His), was almost 20 times as efficient a catalyst as imidazole in the hydrolysis of __p__‐nitrophenyl laurate. The effect of dioxane on the hydrolysis showed that hydrophobic interaction between the cyclic dipeptide and the ester is