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?
Homework Answers
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.
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Bromination of Trans-Cinnamic Acid Lab Question:
The melting point of my product is 115-118C. The percent...
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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
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What is the percent yield of the lab procedure below? my final weight of the product is 0.0519 g
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my final weight of the product is 0.0519 g
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2. Discuss reason for reaction sequence. (Why must one reaction
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3. Explain how IR supports the major product.
Experiment Procedure
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Weigh a 20 mL beaker and then add 380 mg of ortho-vanillin and
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Observe the mixture and record...
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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 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 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
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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 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...
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1. Explain each step of reaction mechanism. (How does it
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Experiment Procedure
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Weigh a 20 mL beaker and then add 380 mg of ortho-vanillin and
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