Advanced chemical oxidation treatment of dye wastewater and

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Nitration (79%) and hydrolysis gave the isomeric 6-aminomethyl-5-nitro compound. 46 The aminomethyl group is a useful link to polymers, sensitizers, initiators, etc. Fischer’s aldehydes having a 2-hydroxyethyl or 2-chloroethyl substituent on the N atom and a 5-nitro substituent were prepared by formylation of the corresponding 2,3,3-trimethylindoline[1,2]-b]oxazines. According to the NMR and IR spectral evidence, the aldehydes, both in solution and the solid state, existed entirely in the open chain form rather than as 2-formylmethyl-2,3,-dimethylindolino[1,2- b]oxazines.

This series constitutes a rather new photochromic or thermochromic system based on proton transfer involving valence and prototropic tautomeric intramolecular reactions (Scheme 8). Scheme 8 8 Introduction The methods of synthesis, the spectral and photochromic properties in solution, in polymer film and in vacuum-deposited thin films, and the structural determinations by X-ray diffraction are reviewed as is the electrochemical behavior of this family of switchable materials. Chapter 9 (Photochromic viologens).

A. Noyes, G. S. Hammond and J. N. ), Vol. 1, p 275, Interscience, New York (1963). 10. G. Porter, Angew. , 80, 882 (1968). 11. P. G. W. Norrish and G. Porter, Nature, 164, 658 (1949). 12. G. Porter, Proc. Roy. , Ser. A, 200, 284 (1950). This page intentionally left blank. 1 Spiropyrans ROBERT C. 1. , a carbon atom is common to both rings. Compounds in which the second ring system is merely a saturated carbocycle such as cyclohexyl or adamantyl are better considered simply as 2,2dialkylpyrans, and are discussed in Chapter 3.

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