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How to find the ratio in a wittig reaction of (E) and (Z) isomers of stilbenes? Started with 5g of sodium hydroxide and 3.8g of benzyltriphenylphosphonium chloride. They want us to find this ratio both before and after isomerization with 75mg of iodine. Also obtained IR, CNMR and HNMR data. Also, how to calculate theorectical yield. The final prodect weight was 3.1124g

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