27610-20-4Relevant articles and documents
NANOSTRUCTURES AND METHODS FOR CHEMICALLY SYNTHESIZING NANOSTRUCTURES
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Page/Page column 16-18, (2011/01/12)
The present invention generally relates to nanostructure compositions, as well as methods for the controlled synthesis of nanostructures, such as carbon nanotubes. In some embodiments, methods involving iterative growth of a nanostructure template to homo
Dual Reactivity of Methoxymethyl Benzenesulfonate in Nucleophilic Substitution
Okuyama, Tadashi,Fueno, Takayuki
, p. 2672 - 2683 (2007/10/02)
Hydrolysis of methoxymethyl benzenesulfenate is catalyzed by both acid and base.Acid-catalyzed hydrolysis is further accelerated by various nucleophiles like halide ions, thiocyanate, dialkyl sulfide, and the substrate itself.The catalytic constants coincide with those for ethyl benzenesulfenate within 2-fold in magnitude.The nucleophilic reactivity strongly suggests the reaction at the sulfenyl sulfur, but examination of the products from the 18O-labeled substrate showed that the bond cleavage occurs mostly between the oxygen and the proformyl carbon except for the acid-catalyzed water reaction which undergoes the S-O cleavage.A mechanism for a nucleophilic reaction at the sulfur to form a sulfurane intermediate which breaks down with the C-O cleavage is presented.The hydrolysis rate is also strongly dependent on the second order of buffer concentrations in carboxylate and tertiary amine buffer solutions.The third-order term involves both the general acid and the conjugate base of the buffer, and the latter reacts at the sulfur as a nucleophile in the rate-determining step but leads to the C-O cleavage in the same way as the other catalytic nucleophiles.
Nucleophilic Catalysis in the Hydrolysis of Methoxymethyl Benzenesulfenate, a Formaldehyde Acetal
Okuyama, Tadashi,Fueno, Takayuki
, p. 2193 - 2196 (2007/10/02)
Acid-catalyzed hydrolysis of methoxymethyl benzenesulfenate is accelerated by nucleophiles (Cl-, Br-, I-, R2S, AcO-, tertiary amines, and the substrate itself) through the attack at the proformyl carbon while water attacks at the sulfenyl sulfur.