[C:1]1([CH3:12])[CH:6]=[CH:5][C:4]([CH:7]=[CH:8][C:9](Cl)=[O:10])=[CH:3][CH:2]=1.[N-:13]=[N+:14]=[N-:15].[Na+].O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O>O1CCOCC1.O.O1CCOCC1>[C:1]1([CH3:12])[CH:6]=[CH:5][C:4]([CH:7]=[CH:8][C:9]([N:13]=[N+:14]=[N-:15])=[O:10])=[CH:3][CH:2]=13-p-Tolyl-acryloyl chloride (22.3 g, 123.3 mmol) in dioxane (50 mL) is slowly added to an ice cooled solution of sodium azide (16 g, 246.6 mmol) in water/dioxane (50 mL, 1/1, v/v) so as to maintain the temperature between 5-10° C. The mixture is stirred for 1.5 hours then poured over 300 g of ice. The resulting white solid is filtered and washed with additional water. The solid (20.72 g, 110.7 mmol) was dried over P2O5 under vacuum overnight and used in the next step without further purification.
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