One-pot synthesis of phenylallyl substituted unsymmetrical ureas under microwave irradiation
A series of phenylallyl-substituted unsymmetrical ureas were synthesized in a one-pot procedure by reactions of cinnamoyl isocyanate, which was prepared from cinnamoyl azide by Curtius rearrangement, with various aromatic amines, 2-amino-5-aryl-1,3,4-thia
Solvent Effekt in the Curtius Rearrangement of Cinnamoyl Azide
The rate of title reaction was studied in seven different solvents.The rate decreases in the order: glacial acetic acid = 80percent ethyl alcohol > ethyl alcohol methyl alcohol > acetone > aniline > benzene.The rate of pyrolysis reaction at the same temperature was very small if compared with that in any solvent.Linear relation was observed between k and (D-1/2D+1) also the (C-T) band (energy of charge transfer band) was shown to be linear in log k. ΔG(excit.) was found to be independent on solvent.The activation parameters of the reaction were determined.
Iskander, M. L.
p. 76 - 82
(2007/10/02)
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