Is rearrangement possible in cyclic bromonium ion?
2018年7月12日 · Now, the bromonium ion you drew where bromine is bonded to 2 carbon atoms is the result of the carbocation “attacking” one electron pair of bromine in an attempt to stabilise itself. Basically, once bromonium reacted with the double bond, you are left with a positive charge which will be offset by the bromide ion ).
Solved What type of reactive intermediate is formed in the - Chegg
What type of reactive intermediate is formed in the reaction of an alkene with Br_2 and water to give a bromohydrin? A. carbocation B. carbanion C. radical D. cyclic bromonium ion Which of the following methods is the best for carrying out the transformation shown? A.
organic chemistry - Regioselectivity of bromination of alkenes ...
2018年8月20日 · The next step is the formation of the bromonium ion, which carries an overall positive charge. A symmetry-changing induction like substituents will always result in asymmetric carbon-bromine bond lengths in the bromonium ion. Since it is a cation, similar rules for the stability/instability as for carbocations apply.
organic chemistry - Bromonium ion or Mesomeric effect
2018年1月20日 · And if bromonium ion is unstable (that is if it can't be formed in 1st reaction) why does it form at all in reaction 2? Why can't the Bromonium ion in the 2nd reaction just undergo a 1,2- hydride shift and convert into the "more stable" ion like 29b. It should also lead to formation of geminal dibromide .It's a circular argument.
Bromination of alkenes - Chemistry Stack Exchange
2015年10月9日 · A cyclic bromonium ion would be formed with the two carbons of the double bond. The second bromide ion (acting as a nucleophile) attacks on the more substitued carbon from the side opposite to the bromonium ion to cause ring …
reaction mechanism - Bromination of an alkene in presence of …
2019年9月20日 · Bromination of an alkene in presence of water results in its mechanism in a cyclic bromonium ion and "afterwards $\ce{H2O}$ binds to the carbon atom surrounded by more electron donating groups." This is what we learned in class and I couldn't understand why.
Solved Part B Br: :Br: Bri :Br: H2C=CH2 HC-CH2 + :Br: | Chegg.com
Part B Br: :Br: Bri :Br: H2C=CH2 HC-CH2 + :Br: :Br-CH2CH2 - Br: cyclic bromonium ion The correct mechanism for the addition of bromine to an alkene is depicted in the image. To understand why Br attacks a carbon of the bromonium ion rather than the positively charged bromine, draw the product that would be obtained if Br did attack bromine.
Solved 11 The mechanism of bromination of an alkene, which
Question: 11 The mechanism of bromination of an alkene, which involves a cyclic bromonium ion, explains why trans-2-butene and cis-2-butene give rise, respectively, to a meso structure and a racemic mixture of 2,3-dibromobutanes Me H Bry BE SH Me Me H Me Me H 8, trans-but-2-ene Meso product H H Me Me Me M B (0) Me cis-but-2-ene Racemic product Make a model and draw
Solved How does the first step in the reaction of propene - Chegg
The first step in the reaction of propene with Br2 forms a cyclic bromonium ion, whereas the first step in the reaction of propene with HBr forms a carbanion. The first step in the reaction of propene with HBr forms a cyclic bromonium ion, whereas the first step in the reaction of propene with Br2 forms a carbocation.
Question: How many lone pairs are on the Br of the cyclic …
n . 6—Br Step 1, Step 2 / Br— Br Step 1 Step 2, + Hey Br HB cyclic bromonium ion Br H vicinal dibromide OOO Not the question you’re looking for? Post any question and get expert help quickly.