Mechanism of general acid catalysis of the aminolysis of an amide

Jencks, William P.; Oakenfull, David; Salvesen, Karin

doi:10.1021/ja00713a056

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Rs-hb+ Srs-+ Hb+ (4)1

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2009

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Cited by 11 publications

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“…For 2-hydroxyethanethiol, cp = 0.55 has been measured and for ammonium ions the value cp = 1.0 is normally expected?.' Substitution of these values into equation (7) gives good agreement with the experimental result for K(H,O)/K(D,O) providing the medium effect is small…”

Section: Rs-hb+ Srs-+ Hb+ (4)supporting

confidence: 64%

Kinetic and equilibrium solvent isotope effects on proton transfer between thiols and amines in aqueous solution

Hibbert¹,

Thomas²

1986

J. Chem. Soc., Perkin Trans. 2

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Section: Rs-hb+ Srs-+ Hb+ (4)supporting

confidence: 64%

Kinetic and equilibrium solvent isotope effects on proton transfer between thiols and amines in aqueous solution

Hibbert¹,

Thomas²

1986

J. Chem. Soc., Perkin Trans. 2

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Acetylation of cellulose using recyclable polymeric catalysts

Sun

2006

J of Applied Polymer Sci

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ABSTRACT:The esterification of cellulose with acetyl chloride in N-methyl-2-pyrrolidinone proceeded smoothly using crosslinked polyvinylpyridine (C-PVP) as catalysts. The structures of the cellulose acetates were confirmed by FTIR, 1 H-NMR, and 13 C-NMR analyses. The molecular weights were determined by GPC, and the thermal properties were characterized with DSC and TGA. The effects of reaction conditions on yields and degree of substitutions were evaluated in detail. C-PVP was recycled by a simple alkali treatment, and the recycled C-PVP could be readily reused as catalysts in cellulose acetylations without adverse effects on the reactions. The influences of C-PVP on the structures of cellulose acetate samples were further discussed.

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