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4- Methoxybenzeneboronic acid

Thus the above observations indicate that the reaction mechanism is not A-l and confirmation was provided by measurement of the solvent isotope effect kH/kD for protodeboronation of 4-methoxybenzeneboronic acid in 6.3 M sulphuric... [Pg.291]

A third mechanism of protodeboronation has been detected in the reaction of benzeneboronic acids with water at pH 2-6.7625. In addition to the acid-catalysed reaction described above, a reaction whose rate depended specifically on the concentration of hydroxide ion was found. In a preliminary investigation with aqueous malonate buffers (pH 6.7) at 90 °C, 2-, 4-, and 2,6-di-methoxybenzeneboronic acids underwent deboronation and followed first-order kinetics. A secondary reaction produced an impurity which catalysed the deboronation, but this was unimportant during the initial portions of the kinetic runs. [Pg.294]

Monomers with pendant methoxyphenyl groups can be synthesized by the bromination of bis(4-fluorophenyl)sulfone, followed by a Suzuki coupling with4-methoxybenzeneboronic acid [22], The synthesis is shown in Figure 7.4. [Pg.181]


See other pages where 4- Methoxybenzeneboronic acid is mentioned: [Pg.288]    [Pg.370]    [Pg.16]    [Pg.288]    [Pg.370]    [Pg.16]    [Pg.18]    [Pg.316]    [Pg.317]   
See also in sourсe #XX -- [ Pg.181 ]




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