A lithographic printing plate precursor is disclosed which comprises a support having a hydrophilic surface or which is provided with a hydrophilic layer, and a coating thereon, said coating comprising an IR absorbing agent and a contrast enhancing compound, characterized in that said contrast enhancing compound has the structure of formula (I). The printing plate comprising the contrast enhancing compound improves the thermoresponsivity of the coating and is capable of improving the resistance of the coating in the non-exposed areas against the alkaline developer.
N-Glycosylations of various heterocondensed uracils of the general type 4 are described. The thieno[2,3-d]pyrimidines (9a-e) afford with 1-0-acetyl-2,3,5-tri-O-benzoyl-D-ribofuranose (7) the corresponding 1-ribosides (10a-e) in a modified Hilbert-Johnson-Birkofer synthesis; from these 10a was smoothly saponified to give the free riboside 11a. - In a more generally applicable stereospecific sodium salt glycosylation procedure employing alpha-acetobromglucose, the 1-glucosides 12-16 and with beta-(trimethylsilyl)ethoxymethyl chloride (SEM-Cl) a variation of acyclonucleosides 17-22 have been obtained. The structure of 18a has been confirmed by X-ray analysis.
Synthesis of Pyrido[2,3-<i>d</i>]pyrimidines and Fused Tetracyclic Derivatives from Methyl<i>N</i>-Aryldithiocarbamates
作者:J. Garin、E. Melendez、F. L. Merchán、T. Tejero
DOI:10.1055/s-1984-30900
日期:——
GARIN, J.;MELENDEZ, E.;MERCHAN, F. L.;TEJERO, T., SYNTHESIS, BRD, 1984, N 7, 586-588
作者:GARIN, J.、MELENDEZ, E.、MERCHAN, F. L.、TEJERO, T.