What evidence that you have a carboxylic acid in your product is observed in you

Question

What evidence that you have a carboxylic acid in your product is observed in your IR spectrum? Find at least two absorptions and list their frequencies and molecular motions.

How many moles of Pd metal are in each mole of the catalyst? How many moles of Pd metal are added to the reaction, assuming you use 1 mL of 0.25 M solution? What is the ratio of the number ofmoles of Pd to moles of limiting reagent? 1 mL of Pd. 0.5g of 4-bromobenzoic acid 0.37g of phenylboronic acid Reaction For today's reaction, you will use 4-bromobenzoic acid and phenylboronic acid to make 4- phenylbenzoic acid (also known as biphenylcarboxylic acid) as the product. As mentioned earlier, the This s reactivity and stability in solution are modified by forming a complex with a specific ligand ligand is shown in the figure below in the brackets. Don't think too much about the function of each component of the complex. Heating this entire complex in the water converts it to Pd' which is needed to start the catalytic cycle shown earlier. The sodium carbonate will maintain the basic conditions required, and all that will be needed to obtain pure product is recrystallization of the crude from ethanol. HO OH HO2C HO2C Nao NH Pd (OAc)2 means Pd complexed together with ligand OAc -acetate ion CH CO2 NaO Properties bp imp mo) Density Other 201 1.9 gmL 2s2.234GCOmp) 4-bromobenzoic acid phenylboronic acid sodium carbonate 106 2.5 g/mL 851 °C (dec) g/mL. 100 C (bp) 567 .1glmL "Pd" 0.25 M solution L-phenyl benzoic acid 198 222-225 (mp) 71

Explanation / Answer

MW of phenyl boronic acid is 122. So 0.37 g of phenyl boronic acid =0.003 mole

MW of 4-bromo benzoic acid is 201. So 0.5 g of 4-bromo benzoic acid = 0.0024 mole

So, 4-bromo benzoic acid is the limiting reagent in this reaction.

Now, 1 ml of 0.25 M Pd solution = 0.00025 mole Pd

So the ratio of number of moles of Pd with the limitng reagent = 0.00025/ 0.0024 = 0.104

That means, 10 mole % Pd catalyst is required with respect to the limitng reagent 4-bromo benzoic acid

IR spectrumabsorptions and their frequencies and molecular motions.

Functional Group

Carboxylic Acid

Functional Group

Carboxylic Acid

Type of Vibration Characteristic Absorptions (cm-1) in IR Intensity   

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