79-02-7Relevant articles and documents
Ensemble effects in nanostructured TiO2 used in the gas-phase photooxidation of trichloroethylene
Yeung,Maira,Ho,Wei,Stolz,Soria,Chao,Hung,Yue
, p. 4608 - 4616 (2002)
The effects of crystal size, structure, and crystallinity on the photocatalytic activity of nanostructured TiO2 with different crystal sizes (3, 5, and 6 nm) for the gas-phase heterogeneous photocatalytic oxidation of trichloroethylene (TCE) wa
Tricyclic base analogues
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, (2008/06/13)
Nucleoside analogues have structure (2) wherein Q is H or a sugar moiety or sugar analogue or a modified sugar or a nucleic backbone or backbone analogue, W is an alkylene or alkenylene chain of 0-5 carbon atoms, any of which may carry a substituent R8, X is O or N or NR12or CR10, X′ is O or S or N, provided that when X′ is O or S, then X is C, Y is CH or N, R6is NH2or SMe or SO2Me or NHNH2, each of R7and R8is independently H or F or alkyl or alkenyl or aryl or acyl or a reporter moiety, R12is independently H or alkyl or alkenyl or aryl or acyl or a reporter moiety, and R10is H or ═O or F or alkyl or aryl or a reporter moiety.
α-(Acyloxy)dialkylnitrosamines: Effects of structure on the formation of N-nitrosiminium ions and a predicted change in mechanism
Hongliang, Cai,Fishbein, James C.
, p. 1826 - 1833 (2007/10/03)
The decay of α-(acyloxy)dialkylnitrosamines in aqueous solutions has been studied with a view toward elucidating mechanistic details and effects of structure on mechanism and reactivity. Rate constants (k1) for the pH-independent decay of 43 α-(acyloxy)dialkylnitrosamines have been determined. Observations from these and other experiments rule out decomposition via an anchimeric assistance mechanism involving the Z isomer that had previously been suggested. All of the reported data for most of the compounds is consistent with a mechanism involving the formation of N-nitrosiminium ions in or before the rate-limiting step. Structure -reactivity correlations indicate that the stability of α-(acyloxy)dialkylnitrosamines is determined by electronic properties of substituents at RN and RC as well as by the ability of substituents RC to engage in hyperconjugative interactions of C-H bonds with the developing cationic center in the transition state for nitrosiminium ion formation. Attachment of substituents of sufficient electron-withdrawing power at RN and RC results in a predicted change in mechanism to what appears to be an acyl group attack mechanism.
