A Full Regioselective and Stereoselective Synthesis of 4‐Nitroisoxazolidines via Stepwise [3 + 2] Cycloaddition Reactions between (Z)‐C‐(9‐Anthryl)‐N‐arylnitrones and (E)‐3, 3, 3‐Trichloro‐1‐nitroprop‐1‐ene: Comprehensive Experimental and Theoretical Study. (8th August 2017)