Browsing by Author "Pratt, M. J."
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- 3-Hydroxy-2,6-dinitroacetophenone: an unusual substitution pattern resulting from nitration of 3-hydroxyacetophenonePublication . Cristiano, Maria Lurdes Santos; Johnstone, Robert A. W.; Pratt, M. J.Nitration of 3-hydroxyacetophenone gives 2,6-dinitro-3-hydroxyacetophenone, C8H6N206, in which the nitro groups have entered the sterically least favourable positions in the aromatic nucleus. None of the expected substitution in the 4-position was observed. The two nitro groups flanking the carbonyl side chain are different in that one is in the plane of the aryl ring but the other is twisted well out of the plane.
- Photoactive materials applicable to imaging systemsPublication . Cristiano, Maria Lurdes Santos; Johnstone, Robert A. W.; Pratt, M. J.; Wade, M. J.Organic photoprecursors of amines are provided for use in photosensitive imaging systems, ?nding particular application in the preparation of lithographic printing plates. Said photoprecursors generate free amines on exposure to long Wavelength UV or visible radiation, have high solubility in organic solvents, and include photolabile 2-nitrobenZyl functional groups. Methods for the synthesis of the photo precursors are described, and the use of the said photopre cursors for the production of printing plates using both positive Working and negative Working techniques are dis cussed.