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Obtain a crude yield and a melting point tube of the crude. Recrystallize the crude product from 95 % ethanol. Report final yield (mass and percent yield) and melting point range of final product. Obtain an IR spectra and record the significant peaks intensities and locations in your note...
range of 20 degrees centigrade :20 degrees centigrade and a liquid state above 40 degrees centigrade having dispersed in it the compound 6-nitro-1,3,3-trimethylbenzoindolinospiropyran, including the steps of (a) heating the layer in the desired pattern areas to its melting point to sensitize ...