calculate the theoretical yield for the bromination of both stilbenes, assuming

Question

calculate the theoretical yield for the bromination of both stilbenes, assuming the presence of excess pyridinium tribromide. Note the theoretical yields here.
Will use 100 microliter of cis-stilbene, 2.0 mL of acetic acid and 200 mg of pyridinium tribromide for cis-stilbene.
Reagents and Properties mpd molar mass mol) bp (c) rc (8/mL) substance quantity 1.049 60.05 118 148.16 340.07 133 acetic acid", glacial cinnamic acid 1,2-dibromo- 2 mL 150 mg 1,2-diphenylethane 2,3-dibromo-3-phenyl- 307.97 propanoic acid ethanol", 95% pyridiniunm 0.5 mL 319 200-385 mg 0.5 mL 100 tribromide* silver nitrate", 2% in ethanol cis-stilbene trans-stilbene 180.25 14513mm 180.25 1.011 100 mg 124

Explanation / Answer

solution:

200mg use of pyridinium tribromide for bromination de100 mg of trans-stilbene
318.8 g / mol pyridinium tribromide = 0.2 g / 318.8 g / mol = 6.27 * 10-4
180 g / mol trans-stilbene = 0.1 g / 180 g / mol = 5.55 * 10-4
(5.55 * 4.10 / 6.27 * 4.10) = 88.6%
1 trans-stilbene + 1 = pyridinium tribromide bromination

the same with the cis-stilbene and thetrans-stilbene. ( the product of each of these isomers if iremember correctly is called dibromostilbene).

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