Abstract
A phosphonium-based catalyst, 2-carboxyethyltriphenyl phosphonium tribromide (CTPTB), has been synthesized by reacting triphenyl phosphine with acrylic acid and potassium bromide under solvent-free condition followed by oxidation of Br− to with KMnO4. This hitherto unknown tribromide reagent is characterized by ultraviolet–visible, Fourier transform–infrared, 1H NMR, and 31P NMR spectroscopy. Its efficacy as catalyst is established by investigating its catalytic activity in silylation of alcohols and thiols by hexamethyl disilazane (HMDS). It is found to be a very good catalyst and selectively and efficiently catalyzes the silylation reactions.
GRAPHICAL ABSTRACT
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ACKNOWLEDGMENT
The authors are thankful to the Sophisticated Analytical Instrument Facility, Indian Istitute of Technology, Bombay, for providing the spectral analyses of the compounds.
Notes
a Alcohol/thiols (20 mmol), HMDS (10 mmol), CTPTB (0.1 mmol).
b Products were identified by their IR and NMR spectral data and comparing them with published data.
c Isolated yield.
d Reactions were monitored by TLC and products were extracted by ethyl acetate.
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