Question   A wittig reaction experiment:   Week 1 -》 preparation of phosphonium salt    Materials : triphenylphosphine (5.3g),methyl Bromoacetate 3.36g (2.1ml)  , ethanol 30ml . The yield obtained was 8.93g .  The percentage yield obtained was 106.4%       Week 2 -》 Formation of the ylide and wittig reaction    Materials :Phosphonium salt  (5g),  napthyl-2- carboxwaldehyde( 2.65g), 20 ml of water and 5 nl of Nahco3.   Yield obtained was 0.51g .Calculate the percentage yield       Week 3: Solvent free wittig reaction    Materials: Benzyltriphenylphosphonium chloride (0.5g ), 4 - Bromoabenzaldehyde (0.24g), Potassium phosphate (tribasi c) 0.275g .The yield obtained was 1.21g. Calculate the  percentage yield

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