Methyl-3-Phenyl-2-Propenoate Lab Report

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Abstract In this experiment methyl-3-phenyl-2-propenoate was prepared using a Wittig reaction. Benzaldehyde and methyl (triphenylphosphoranylidene) acetate were used to give a final product. 0.33g of methyl3-phenyl-2-propenoate was found at the end of the experiment therefore the percentage yield of methy-3-phenyl-2-propenoate is 62%. The Rf value of benzaldehyde was found to be 0.85. The Rf value for methyl-3-phenyl-2-propenoate was found to be 0.83, the Rf values are almost the same therefore the product does contain benzaldehyde. The solvent that was used is 70:30 hexane ethyl acetate. Aim The aim of this experiment is to synthesise methyl-3-phenyl-2-propenoate Introduction Wittig reaction is a reaction between a ketone or aldehyde with phosphonium ylide to form an alkane and …show more content…

Percentage yield = actual yield × 100% Theoretical yield Actual yield in moles= 0.33g/162 = 2.03×10-3mol Percentage yield = (2.03×10-3/5×10-3) × 100% =0.41% Reaction of benzaldehyde with methyl (triphenylphosphoranylidene) acetate Mechanism of a Wittig reaction Table1: Rf values for tlc with 70:30 hexane ethyl acetate sample Rf value a b Benzaldehyde 0.85 34 40 Methyl-3-phenyl-2-propenoate 0.83 33.2 40 B P Figure1: TLC plate of benzaldehyde and methyl-3-phenyl-2-propenoate Key: B= Benzaldehyde P= Methyl-3-phenyl-2-propenoate

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