Grignard Reagent Reaction Mechanism
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- čas přidán 3. 05. 2018
- This organic chemistry video tutorial discusses how to use the grignard reagent to reduce ketones and aldehydes into secondary and tertiary alcohols. It also explains how to reduce esters and acid chlorides to alcohols using the grignard reagent.
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And a quick question. For the compound in 9:45 won't a ring expansion be more favourable before the addition of the -R group?
this is an SNAE mechanism! rearrangement is only possible when a carbocation is formed. this reaction involves carbanion nucleophile and no carbocations are formed, so no rearrangements
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could you please make a discussion about Reaction of Grignard Reagents with Epoxides
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@7:03 Why didn't O get protonated at this moment? Why did it kick the OCH3 out instead?
Doesnt it matter that you change the position of the CH3 Group in the first example?
So, the Ch3Ch2, we use it twice because we need the oxygen to be negative in order for it to do the proton transfer of hydronium? So it can be an alcohol?
Thanks
At 3:35, if we had to name this structure would be it be (A) 1-ethyl cyclohexanol or (B) 1-ethyl cyclopentanol? If its (B), why? when counting the longest chain starting with the ethyl group
Thank you
How do you know what side to put your reagent on? I keep thinking that you could choose either or because you’ll still end up with the same answer..? 08:26 I’ve seen others put their reagents on the aldehyde side and they’ve gotten it the answer right.
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At 12:18 I believe this is an epoxide ring opening under basic conditions so the OH lands on the more substituted atom, please correct me if I’m wrong
Thanks a lot ...
is attack by GR always SN2? is there a possibility of rearrangement or ring expansion?
9:28 are there supposed to be that many carbons attached to the grignard reagent?
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At 7:14 why didn't the O¯ get protonated and turned into an alcohol instead?
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Thankyou
Why is at times the h30+ is written under the arrow and other times it isnt even though its still used
What if you created a grignard reagent with bromobenzene and magnesium, then bubbled carbon monoxide through the solution?
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How do you know of the Carbon is partially positive or negative?
When carbon is attached to a more electronegative atom like O of N ..the more electronegative atom attracts the shared pair of electrons from the electron cloud towards itself ..so it develops partial negative charge.
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Can you also make multiply substituted grignard reagents from muliply substituted benzene, such as Para dichlorobenzene and magnesium.