Ultrasonic Aptitude of Regioselective Reaction of 6-bromo-spiro-3,1-benzoxazinone2,1-isobenzofuran-3,4-dione Towards Some Electrophilic and Nucleophilic Reagents by Maher A. El-Hashash Sameh A. Rizk Azza A. El-Badawy

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