Consider the bromination of cis-stilbene. What product(s) are expected? What is the stereochemical relationship of those...
Consider the bromination of cis-stilbene. What product(s) are expected? What is the stereochemical relationship of those products to the product(s) you synthesized from trans- stilbene?
Homework Answers
Bromination of alkene happens in anti manner.
Cis alkene + Anti addition gives racemic mixture i.e two enantiomers in 1:1
Trans alkene + ANti addition gives us meso compound.
Relation between two enantiomers formed with cis stilbene and meso compound formed with Trans stilbene is that thay are diasteromers.
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Consider the bromination of cis-stilbene. What product(s) are
expected? What is the stereochemical relationship of those...
1. What is the expected product melting point if the bromination of stilbene by PHPB is...
1. What is the expected product melting point if the bromination of stilbene by PHPB is completely stereospecific (anti addition)? 2. How would the melting point be affected if the reaction is not completely stereospecific and the dibromide product contains significant amounts of dl-stilbene dibromide, as well as the expected meso stilbene dibromide? Note the widely differing melting points of the meso and dl isomers. 3. What is the theoretical yield of dibromide product in the bromination reaction? 4. How...
help with limiting reagents and percent yield needed the reactions are the bromination of cis-stilbene and...
help with limiting reagents and percent yield needed
the
reactions are the bromination of cis-stilbene and trans-stilbene.
The reagents and the moles of each reagent are in my data, as is
the moles of the products formed. The volume and mass of the
reagents are given as well. I need to know how to find the percent
yield and what the limiting reagents are for both the trans and cis
stilbene brominations. The information is there.
Name Physical Properties of...
1. Bromination of an alkene is restricted to a syn addition. In this problem you will...
1. Bromination of an alkene is restricted to a syn addition. In this problem you will design an experiment to validate or provide evidence that alkene bromination undergoes syn addition You will use the following starting alkene a) trans-stilbene b) cis-stilbene A. Draw the mechanisms showing all electron flows (curved arrows) and the cyclic halonium intermediate to predict the stereochemical products of the bromination reaction for (a) trans-stilbene and (b) cis-stilbene formed from syn addition. B. Design the experiment to...
Consider the following equilibrium: Cis-stilbene ↔ Trans-stilbene Kc = 10.9 If a reaction initially contains [cis-stilbene]...
Consider the following equilibrium: Cis-stilbene ↔ Trans-stilbene Kc = 10.9 If a reaction initially contains [cis-stilbene] = 0.017 M and [trans-stilbene] = 1.114 M, what is the equilibrium concentration of [trans-stilbene]?
3. The previous mechanism was for the bromination of trans-stilbene. The next several questions Uy will...
3. The previous mechanism was for the bromination of trans-stilbene. The next several questions Uy will refer to the same mechanism, but using cis-stilbene. i t a. Draw cis-stilbene. (3 pts) deb baho o o dston 50302- adi ola) obblehemsiz n 20 Bobong odib-1-modb- 023 YOYO MOY on yd behou om bb b. Draw the bromonium ion intermediate that would be obtained in the bromination of ubo cis-stilbene. (5 pts) 2012 mainsbemastr o na 5 18-18: 19 19. HP C....
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part...
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part A). For this assignment write a detailed procedure in your lab notebook for Part B. Upload a picture/scanned copy (5 pts). Tip: If you write the procedure down the left half of the page, you can leave space to record your measurements/observations down the right side of the page. If you end up using cis-stilbene in the experimental there will only be a few...
1) Write a stepwise mechanisms for the bromination of: a) trans-stilbene and b) cis-stilbene (substitute benzene...
1) Write a stepwise mechanisms for the bromination of: a) trans-stilbene and b) cis-stilbene (substitute benzene rings by Ph-notation for convenience; e.g., stilbene could be written as Ph- CH=CH-Ph). I 2) Use (S) and (R) nomenclature to label all stereogenic centers in the above products (each has two stereogenic centers) in problem 1. Identify any enantiomers and meso-products. 3) Complete the following table including formula weights and grams and moles of reagents used in order to calculate a theoretical yield...
a. Draw cis-stilbene. (3 pts) b. Draw the bromonium ion intermediate that would be obtained in...
a. Draw cis-stilbene. (3 pts) b. Draw the bromonium ion intermediate that would be obtained in the bromination of cis-stilbene. (5 pts) C. Draw the two products that would be obtained in the bromination of cis-stilbene. Assign the stereocenters as Sor R. (10 pts) d. What is the relationship between these two products (pair of enantiomers or identical)? (3 pts)
alswering these questions. 1. If the bromination of trans-stilbene proceeded by syn addition what isomer(s) of...
alswering these questions. 1. If the bromination of trans-stilbene proceeded by syn addition what isomer(s) of stilbene dibromide would be formed? 2. If the bromination of trans-stilbene proceeded by anti addition what isomer(s) of stilbene dibromide would be formed? 3. Which isomer(s) of stilbene dibromide would be formed if the reaction followed Mechanism 4? Mechanism 4: Bromination is a multi-step process. In this mechanism, the pi bond attacks the bromine molecule as in Mechanism 1. Some time after the carbocation...
Draw the reaction and reaction mechanism for the reaction of both cis and trans stilbene with...
Draw the reaction and reaction mechanism for the reaction of
both
cis
and
trans
stilbene with Br2
as part of your prelab procedure.
Note: I'm not sure what the
mechanisms look like so that's why I'm having trouble with the
products. Please, if you can, draw out the mechanisms for both of
these!! Thanks.
cis-stilbene trans-stilbene
help with limiting reagents and percent yield needed
the
reactions are the bromination of cis-stilbene and trans-stilbene.
The reagents and the moles of each reagent are in my data, as is
the moles of the products formed. The volume and mass of the
reagents are given as well. I need to know how to find the percent
yield and what the limiting reagents are for both the trans and cis
stilbene brominations. The information is there.
Name Physical Properties of...
1. Bromination of an alkene is restricted to a syn addition. In this problem you will design an experiment to validate or provide evidence that alkene bromination undergoes syn addition You will use the following starting alkene a) trans-stilbene b) cis-stilbene A. Draw the mechanisms showing all electron flows (curved arrows) and the cyclic halonium intermediate to predict the stereochemical products of the bromination reaction for (a) trans-stilbene and (b) cis-stilbene formed from syn addition. B. Design the experiment to...
3. The previous mechanism was for the bromination of trans-stilbene. The next several questions Uy will refer to the same mechanism, but using cis-stilbene. i t a. Draw cis-stilbene. (3 pts) deb baho o o dston 50302- adi ola) obblehemsiz n 20 Bobong odib-1-modb- 023 YOYO MOY on yd behou om bb b. Draw the bromonium ion intermediate that would be obtained in the bromination of ubo cis-stilbene. (5 pts) 2012 mainsbemastr o na 5 18-18: 19 19. HP C....
1. Most of the class will be brominating trans-stilbene (part B) and the rest cis-stilbene (part A). For this assignment write a detailed procedure in your lab notebook for Part B. Upload a picture/scanned copy (5 pts). Tip: If you write the procedure down the left half of the page, you can leave space to record your measurements/observations down the right side of the page. If you end up using cis-stilbene in the experimental there will only be a few...
1) Write a stepwise mechanisms for the bromination of: a) trans-stilbene and b) cis-stilbene (substitute benzene rings by Ph-notation for convenience; e.g., stilbene could be written as Ph- CH=CH-Ph). I 2) Use (S) and (R) nomenclature to label all stereogenic centers in the above products (each has two stereogenic centers) in problem 1. Identify any enantiomers and meso-products. 3) Complete the following table including formula weights and grams and moles of reagents used in order to calculate a theoretical yield...
a. Draw cis-stilbene. (3 pts) b. Draw the bromonium ion intermediate that would be obtained in the bromination of cis-stilbene. (5 pts) C. Draw the two products that would be obtained in the bromination of cis-stilbene. Assign the stereocenters as Sor R. (10 pts) d. What is the relationship between these two products (pair of enantiomers or identical)? (3 pts)
alswering these questions. 1. If the bromination of trans-stilbene proceeded by syn addition what isomer(s) of stilbene dibromide would be formed? 2. If the bromination of trans-stilbene proceeded by anti addition what isomer(s) of stilbene dibromide would be formed? 3. Which isomer(s) of stilbene dibromide would be formed if the reaction followed Mechanism 4? Mechanism 4: Bromination is a multi-step process. In this mechanism, the pi bond attacks the bromine molecule as in Mechanism 1. Some time after the carbocation...
Draw the reaction and reaction mechanism for the reaction of
both
cis
and
trans
stilbene with Br2
as part of your prelab procedure.
Note: I'm not sure what the
mechanisms look like so that's why I'm having trouble with the
products. Please, if you can, draw out the mechanisms for both of
these!! Thanks.
cis-stilbene trans-stilbene
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