Complex splitting | Spectroscopy | Organic chemistry | Khan Academy

Predicting the splitting pattern when a proton has two different kinds of neighboring protons using a splitting tree. Created by Jay.
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Organic Chemistry on Khan Academy: Carbon can form covalent bonds with itself and other elements to create a mind-boggling array of structures. In organic chemistry, we will learn about the reactions chemists use to synthesize crazy carbon based structures, as well as the analytical methods to characterize them. We will also think about how those reactions are occurring on a molecular level with reaction mechanisms. Simply put, organic chemistry is like building with molecular Legos. Let's make some beautiful organic molecules!
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[@sydneypenrose9573]

Omg this is so amazing, I could cry. My prof couldn't explain this AT ALL. Thank GOD for Khan!!

[@samuelwamwere4867]

Are we classmates? hahahahah

[@mariaanna4271]

I cannot be grateful enough for these videos. thank you from the bottom of my heart

[@deepakkumarraushanbs21b012]

Ooo ,Nice

[@andrewmontoya8511]

alr calm down

[@cutiebeastiepie7415]

thank God for khan academy 😭❤️

[@Fiona2023]

this is so clearly explained, thank you!

[@na-chan163]

I was waiting for the explanation as to why the double doublet have different heights..

[@reemmohd6138]

Such an amazing explanation, thank you very much!

[@devyndevyndevyn]

didnt make any sense until this video. thank u sincerely.

[@victorianicol-smith9436]

Amazing, thank you!

[@migster8570]

how do you know which proton to start the splitting from?

[@sadafsattar_]

Greater the coupling constant, more the splitting strong.. so start with the proton of high coupling constant.

[@songohan393]

thank you sooooo much

[@vaniabessos6381]

Very helpful, thank you

[@gardeniaflower9202]

Thank you so much you are amazing ❤️

[@karta273996]

Amazing,It helps me a lot!!

[@jagadeeshmanda2497]

At the time of 5.55 cis coupling never give j=12 hz

[@gilong1311]

Thanks so much!

[@oliviajones7300]

For the molecule at 5:10, I thought coupling only occurs if they nuclei are 3 bonds or less apart? Does a double bond just count as 1 when you’re counting the bonds that separate them?

[@joelokoye23]

yeah, double bonds only count as 1 bond. What I don't understand though is at 1:08 he says that the n+1 rule only works for protons that are chemically equivalent (i.e. they in the same chemical environment and so have the same chemical shift). Isn't it the the other way round? Doesn't the n+1 rule work for chemically inequivalent protons?

[@nerdyexchange5184]

@@joelokoye23 Maybe he equivalent, by the hydrogens that are in the same environment compared to the "blue" hydrogen we are focussing on. So, those hydrogens are equivalent (for an example that only works sometimes: a methyl group) but inequivalent relating to the hydrogen we are focussing on?

[@vijayvarghese1652]

what happens when their is overlap? does it still get counted as 2 peaks?

[@Naddygirly]

how do I know the Hz for the different protons (coupling constant)?

[@rfrend365]

You just saved my life

[@shrutimishra4298]

Sr in second ex why d J value is 7 hz whereas d J value in general for geminal alkene protons in between 0 to 3

[@gilles-philippepage7475]

Why is the higher peak 'inside'. I referred to the geminal coupling right before where we learned that the signals point to each other in the case of germinal coupling but I also understand geminal coupling to apply only when 2 non-equivalent protons are one the SAME carbon. This is not what we have here so I am still unsure why we see this type arrangement. Thanks!!

[@KasunWekasinghe93]

what if we draw 6Hz double before 12Hz one when making the spliting tree

[@Piepje444]

+Kasun Wekasinghe You should try it, and notice it doesn't make a difference

[@Mvnerv_]

I still don't get it :'(

[@stella444]

wait I thought n + 1 is for non equivalent protons?

[@noquote6838]

nop, its for equivalent protons

[@aiishsheikh5451]

plz plz anybdy send me spectrum of appatent Dt having 6 peaks

[@SerpentGameplay]

Shouldn't the "7Hz" splitting be two times the length of 3.5? Now the 7Hz signal is 14 Hz long...

[@ogn8343]

can you explain more. so i can help you ? since there was not 14 hz long

[@IloveLeeDaHye]

I agree, and it should be 13,6,6,-1,-1,6,6,13, that means 6 peaks totally

[@huzaifaabedeen7119]

Sal Khan?

[@huzaifaabedeen7119]

Where is sal Khan