Question

Bromination of Trans-Cinnamic Acid Lab Question: The melting point of my product is 115-118C. The percent...

Bromination of Trans-Cinnamic Acid Lab Question:

The melting point of my product is 115-118C. The percent yield was 19.2%.

Is the product erythro or threo?

From the melting point, I am guessing it is the threo. But wasn't the product supposed to be erythro?

Can someone explain this result? And what is a possible reason why the yield is very low?

0 0
Add a comment Improve this question Transcribed image text
Answer #1

As your product melting point lies closer to the threo isomer, we can conclude that the product contains more of threo isomer. The reaction should not be heated beyond 50oC, to obtain erythro product as a major product.

Add a comment
Know the answer?
Add Answer to:
Bromination of Trans-Cinnamic Acid Lab Question: The melting point of my product is 115-118C. The percent...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • help with melting point and pure product. thank you Bromination of Stilbene lab would my product...

    help with melting point and pure product. thank you Bromination of Stilbene lab would my product be pure and why based on the following data Melting point Crude: 236.4 - 240.2 ℃ Product 238.7-239.9 ℃ Lit melting point: 235-241℃

  • These questions are related to orginac chemistry lab Bromination of Cinnamic Acid QUESTION 3 What are...

    These questions are related to orginac chemistry lab Bromination of Cinnamic Acid QUESTION 3 What are nature's catalysts? QUESTION 4 Although chlorofluorocarbons present significantly reduced direct human health hazards compared to simple chlorinated solvents, they highlight the essential environmental shortcoming of this general class of solvents because they contribute to the destruction of stratospheric ozone. True False QUESTION 5 The ideal sample for a melting point is only 2-3 mm in height in the capillary tube. True False

  • The product was 2,3-dibromo-3-phenylpropanoic acid, with a melting point of 198-200 °C . So a racemic...

    The product was 2,3-dibromo-3-phenylpropanoic acid, with a melting point of 198-200 °C . So a racemic mixture of (2R,3S) and (2S,3R). Based on your knowledge of the bromination of alkenes, did this alkene behave like other alkenes, or was the mechanism different than what you expected? (1 pt) ОН NHBrz acetic acid NHBr Br 0 OH Br 2,3-dibromo-3- phenylpropanoic acid pyridinium bromide trans cinnamic acid pyridinium bromide perbromide

  • prelab wants me to draw a mechanism for both pairs. so one mechanism for the 93-95...

    prelab wants me to draw a mechanism for both pairs. so one mechanism for the 93-95 C pair and another mechanism for the 202-204 C pair. Please draw out full mechanism with arrow pushing please for both! trans-cinnamic acid Bromination of trans-cinnamic acid can result in the formation of two different pairs of enantiomers (see Figure 4). Fortunately, the pairs of enantiomers have very different melting points. Thus, we can determine the result of this reaction by examining the melting...

  • here is the procedure if needed EXPERIMENT 8: BROMINATION OF TRANS-STILBENE glacial acetic acid Objective: Execute...

    here is the procedure if needed EXPERIMENT 8: BROMINATION OF TRANS-STILBENE glacial acetic acid Objective: Execute first step of two-step sequence to transform an alkene into an alkyne via a dihalide intermediate and use infrared spectroscopy to identify functional groups PRELAB NOTEBOOK: In the laboratory notebook, write the overall experimental objective, chemical equation(s), reaction mechanism (consider all possible stereoisomers), draw a diagram or outline of the procedural steps, and complete the chemical safety table for all chemicals. 1. Why is...

  • Postlab Questions Answer the following questions on a separate sheet or in your lab notebook. Make...

    Postlab Questions Answer the following questions on a separate sheet or in your lab notebook. Make sure that the copy page is readable! D) Calculate the percentage yield for both reactions. Show all calculations. 2) What is the color of the reaction at the beginning of reaction? What causes the color? 3) Why do you dissolve maleic acid in diethyl ether and fumaric acid in water? 4) Give the complete reaction mechanisms for the formation of meso and racemic 2,3-...

  • What is the percent yield of the lab procedure below? my final weight of the product is 0.0519 g

    what is the percent yield of the lab procedure below? my final weight of the product is 0.0519 g sure of the proper disposal methodl, properly Check with your laboratory insructor if you are PROCEDURE Be sure to dry the 5-mL reaction vial in the oven for at least twenty minutes. Water is experiment. this Preparation of the Ylide 1. Place 0.480 g of benzyltriphenylphosphonium chloride in a dry, 5-mlL reaction vial containing a magnetic spin vane Add 2 mL...

  • CHROMIC ACID OXIDATION Pre Lab Questions the amounts of materials that will be used from the...

    CHROMIC ACID OXIDATION Pre Lab Questions the amounts of materials that will be used from the experimental section above) H2SO4 + Na2Cr207 2H20- H2O, A Molecular Weight Theoretical yield amount moles on (if applicable) Equivalents 2. Look up the melting point for p-nitrobenzoic acid and record the reference. 3. What color change is expected to be observed in the reaction? Explain why. CHROMIC ACID OXIDATION Experimental Procedure: Part I: Synthesis of p-nitrobenzoic Acid 1. Under the hood, add 0.400 g...

  • Multistep Synthesis: Synthesis of Amine (Organic Chemistry Lab) Question 1. Explain each step of reaction mechanism....

    Multistep Synthesis: Synthesis of Amine (Organic Chemistry Lab) Question 1. Explain each step of reaction mechanism. (How does it work?) 2. Discuss reason for reaction sequence. (Why must one reaction occur before another?) 3. Explain how IR supports the major product. Experiment Procedure Imine Formation: Weigh a 20 mL beaker and then add 380 mg of ortho-vanillin and 268 mg of para-toluidine. Care should be taken to add equivalent molar amounts of the two reactants. Observe the mixture and record...

  • Deducing a Reaction Mechanism for the Isomerization of Maleic acid to fumaric acid. I'm completing my...

    Deducing a Reaction Mechanism for the Isomerization of Maleic acid to fumaric acid. I'm completing my organic chemistry lab report and answering questions and I have very confused and would appreciate any help and explanation please. I appreciate it. Test Tube Solids Solvents Precipitate A 1.0 g maleic acid 3.0 mL 6 M HCl Yes B 1.0 g maleic acid 3.0 mL 3 M H2SO4 No C 1.0 g maleic acid 0.5 g ammonium chloride 3.0 mL distilled water No...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT