Synthesis of selenium-substituted pyrroles and pyrazol-3-ones
An approach to the synthesis of 4-(phenylseleno)pyrroles, 4-(phenylseleno)pyrazol-3-ones, and 4-(1,3-benzoselenazol-2-ylthio)pyrazol-3- ones is described. Their formation passes through hydrazonic intermediates obtained by the reaction between 1,2-diaza-1