Lambda max of enone with diene
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- เผยแพร่เมื่อ 5 ต.ค. 2024
- In spectroscopy, how can we calculate lambda max value of a structure having both enone and conjugated diene by using woodward-fieser rules?
It's all possible if we carefully observe all the increments. In this video we will see two structures one is having enone along with homoannular diene and another one is having enone along with heteroannular diene and how we can calculate lambda max value.
#lambdamax
#spectroscopy
#enone
this lecure is made on true student mind questions..awesome
Great explanation . But the last example calculation is 333. Isn’t it😬
Yes..it should be 333nm
Yeah
THANKS for the video it was helpful, just one thing in the last example the value of lamda max is 333nm and not 343nm
I guess it was miscalculation
Genius, genius 😎😎😎😎😎😎😎😎😎 oo
For the last compound the answer is 333 nm if I'm not wrong
right
yeah
Yeh right
Yah right
Right ▶️
Hello I have a question. My professor considered this example to have 2 exocyclic double bond making it have a total of 390 nm lambda max. What do you think about it? I get your point that the double bond on B is also double bond on C but I think my professor has included it in calculation.
In the first case, you have added an increment of 39 for Homocyclic diene, while in the 2nd case, you didn't add any increment for Heterocyclic diene? Are there no increments for Heterocyclic dienes?
nope
Waw what a explanation thank you so much
U make very nice videos.. good work ..and upload more
Thank you so much!
❤ helpful
So glad!
Nice Explanation 🤘👌👌👌
What about polyenes with conjugation greater than 4 double bond
Hallo I have a question . Calculation of lambda max in spectroscopy two enones in one compound
This video is very helpful for calculate the lemda max
Hii
Upload more on nmr , uv ,ir graph ilucidation or structure prediction from above graphs ...
that is very useful thanks a lot
Well explained
How to determine lmda max of 3- methylcyclohex-. 2 -enon
Nice explanation
Very nice vidio
How I can calculate lambda max of 1,5 Hexadiene......?? Plzz explain it.....🙏
Thanks for your excellency...
You are most welcome
Enone me RR ko count krte h kya
Thnks alot sir for the shared knowledge
It's my pleasure. Thanks for watching
Sir it is 390 for the first structure by total
Excellent
why we considering it 2 conjugated diene
So helpful ✨
Why and what is higher value 🤔
😊
Sir in the end 333nm will come
Thanku sir 🙏☺️
so if I understood it correctly at 8:20, you need to calculate with two extended conjugation because it is attached to the enone? (But where? between alpha and beta C and gamma and delta C or where the homocyclic diene is?) Than why do I need to calculate also with the homocyclic Diene? Help pls I am confused...
These calculations are based on empirical rules which are used to calculate lambda max nearer to true value. So we have to consider all possibilities. When enone is extended by two double bonds , increment of 60 nm is to be given. These double bonds may or may not form homocyclic diene. If they form homocyclic diene, then we have to give extra increment of 39 nm.
Hi beautiful
Sir this is same as woodward Fisher rule?
Yes, here same woodward-fieser rules are used for a structure having both enone and conjugated diene.
Addition is 333
I'm sorry but can anyone explain why he chose enone instead of conjugated diene please? My listening skill is suck
I would like to know about this. If I am not wrong, he chose enones over dienes because of intensity. I am not sure.
Bsc students