Question

Green synthesis of Chalcones:

we carried out a reaction of green synthesis of chalcones using 4-methylacetophenone and 4-methylbenzaldehyde. Ideally we should have used 5 mmol for each, but we used 0.6 ml of 4-methylacetophenone and 0.5ml of 4-methylbenzaldehyde. Draw the complete reaction of this experiment, and show what is the limiting reagent that should be used to calculate percent yield.

Answer 1

1,3-di-p-tolylprop-2-en-1-one Chemical Formula: C17H180 Molecular Weight: 236.31 5 2. 2 4-methylbenzaldehyde 4-methylacetophenone Chemical Formula: CgH100 Molecular Weight: 134.18 Chemical Formula: CaHgO Molecular Weight: 120.15 Density: 1.019 g/mL (literature known) Density: 1.004 g/mL (literature known) volume taken 0.5 mL volume taken 0.6 mL weight volume density 0.6 1.004 0.6024 grams number of moles weight molecular weight =0.6024/ 134.18 0.004489 weight volume * density 0.5 1.019 0.5095 grams number of moles weight molecular weight 0.5095 120.15 0.004240 Limiting reactant is the reactant with less number of moles. Hence here 4-methylbenzaldehyde is limiting reactant. Theoretical yield = number moles of limiting reactant product molecular weight percentage yield isolated yield /theoretical yield 100