Authors:Rajesh Munirathinam, Andrea Leoncini, Jurriaan Huskens, Herbert Wormeester, and Willem Verboom
Cinchona alkaloid and proline derivatives as enantioselective catalysts were covalently attached onto the inner walls of a microreactor using glycidyl methacrylate polymer brushes. The successful formation of the organocatalyst-functionalized brush layers on flat silicon oxide surfaces was confirmed by several techniques such as Fourier transform infrared (FT-IR), ellipsometry, and X-ray photoelectron spectroscopy (XPS). The applicability of the cinchona alkaloid (cinchonidine or quinidine)- and proline-containing polymer brushes in a microreactor was demonstrated for the Diels–Alder reaction between anthrone and N-substituted maleimides, and the aldol reaction between 4-nitrobenzaldehyde and cyclohexanone, respectively, which showed moderate conversions (up to 55% and 23%, respectively) and moderate to good enantioselectivities (up to 55% and 93%, respectively). The pristine catalytic activity of the microreactor was intact even after 1 month.
Authors:D. Gaudet, A. Laroche, Á. Ergon, and J. Mullin
Somani, B. L., Khanade, J., Sinha, R. (1987): A modified anthrone-sulfuric acid method for the determination of fructose in the presence of certain proteins. Anal. Biochem. , 167, 327- 330.
A modified anthrone-sulfuric acid