Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Oswald S. Tee"'
Publikováno v:
The Journal of Organic Chemistry. 65:6879-6889
The effects of four cyclodextrins (alpha-CD, beta-CD, hydroxypropyl-beta-CD, and gamma-CD) on the aminolysis of p-nitrophenyl alkanoates (acetate to heptanoate) by primary amines (n-propyl to n-octyl, isobutyl, isopentyl, cyclopentyl, cyclohexyl, ben
Autor:
Oswald S Tee, Ogaritte J Yazbeck
Publikováno v:
Canadian Journal of Chemistry. 78:1100-1108
Thiolysis of p-nitrophenyl esters (acetate to decanoate) by the anion of 2-mercaptoethanol (ME) is catalyzed by micelles of cetyltrimethylammonium bromide (CTAB) in aqueous solution. At fixed [ME], the observed rate constants (kobs) show saturation w
Publikováno v:
Canadian Journal of Chemistry. 78:436-443
Acid-catalyzed hydrolysis of acetophenone dimethyl acetal (ADMA) and trimethyl orthobenzoate (TMOB) is retarded by cyclodextrins (CDs): α-CD, β-CD, hb-β-CD = "hydroxypropyl-β-cyclodextrin", and γ-CD. The observed first order rate constants (kobs
Publikováno v:
Canadian Journal of Chemistry. 78:436-443
Autor:
Michael J. Boyd, Oswald S. Tee
Publikováno v:
Canadian Journal of Chemistry. 77:950-959
The effects of cyclodextrins (CDs) on the rate of nucleophilic attack on 1- and 2-naphthyl acetates (1-NA and 2-NA) in aqueous solution have been investigated. Analysis of the variation of the pseudo-first-order rate constants with [nucleophile] and
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :123-128
Hydrolysis of benzaldehyde dimethyl acetal 1 in aqueous acid is slowed down greatly by cyclodextrins (CDs): α-CD, β-CD, hp-β-CD (hydroxypropyl-β-cyclodextrin) and γ-CD. The variations of the observed first-order rate constants (kobs) with [CD] e
Autor:
Ogaritte J. Yazbeck, Oswald S. Tee
Publikováno v:
Canadian Journal of Chemistry. 75:1434-1438
The cleavage of p-nitrophenyl alkanoates (acetate to octanoate) at high pH is modestly catalyzed by micelles formed from cetyltrimethylammonium bromide (CTAB) in aqueous solution. Rate constants exhibit saturation behaviour with respect to [CTAB], co
Publikováno v:
Canadian Journal of Chemistry. 75:83-91
The effects of β-cyclodextrin (β-CD) on the kinetics of the reaction of α-amino acid anions with p-nitrophenyl acetate (pNPA) and p-nitrophenyl hexanoate (pNPH) have been investigated. Pseudo-first-order rate constants obtained with various concen
Autor:
Oswald S. Tee, Javier B. Giorgi
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :1013-1018
Evidence is presented of a reacting guest–host system where binding of an ‘allostere' to the host inhibits its reaction with the guest by one particular mode and promotes its reaction by another. Simple aliphatic alcohols do not slow down the bas
Autor:
Valerie D. Geldart, Robert S. McDonald, Elizabeth C. Carmichael, Lawrence D. Colebrook, Georgia D. Spiropoulos, Sheila Rose, David B. Moore, Oswald S. Tee
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :2609-2620
Kinetic studies of the ring-opening and reclosure reactions of thiamine and three other thiazolium ions (Q+) in aqueous solution, in the pH range 0–13, have been carried out by stopped-flow and conventional UV–VIS spectrophotometry. At high pH, r