1,4-Dichloro-2-butene, (2E)- → 2-((2E)-4-chlorobut-2-en-1-yl)-2,3-dihydro-1H-isoindole-1,3-dione

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Ex-7a) Under argon, to 65.8 g of trans-1,4-dichloro-2-butene was added in portions 47 g of potassium phthalimide with mechanical stirring maintaining the temperature between 100° C. and 110° C. The reaction mixture was then stirred for 2 h keeping the temperature between 145° C. to 150° C. It was then cooled to 20° C. and extracted with 3×400 mL of ether. The ether layer was separated and stripped to give a solid. This solid was recrystallized from ethanol to yield yellow crystals of N-(trans-4-Chloro-2-butenyl)phthalimide, wt. 36 g, 61% yield. Analysis calcd. for C12H10ClNO2 (MW 237.25): C, 61.26; H, 4.29; N, 6.02; Cl, 14.94; Found C, 61.18; H, 4.30; N, 5.98; Cl, 14.62.

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