E-Z system | Alkenes and alkynes | Organic chemistry | Khan Academy

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E-Z notation can be used to describe the configuration of a double bond with two or more substituents. To do so, each substituent is assigned a priority using the Cahn-Ingold-Prelog rules. If the two higher priority substituents are on same side of the double bond, the configuration of the bond is Z. If the two higher priority substituents are on opposite sides of the double bond, the configuration of the bond is E.
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[@AlexsAmazingIpad]

This is so E-Z now

[@ejejwvqjqiwhwh]

😂

[@pamelag3879]

Agreed!!

[@terabaap2686]

Yap

[@maroonhorizon1693]

Alex Gill hi

[@RHAYALUV]

😂😂😂

[@MyTD2010]

my reaction to first part of explanation: "OOH" my reaction to second part of explanation "OHH" :)

[@ayandagumede3812]

Ze Zame Zide... Never gonna forget this, Thanks

[@heyiscatarina]

this is so helpful, i wish I had found this sooner

[@TeamPill]

The title includes alkynes in it. I understand the overall topic is both alkenes and alkynes, but this is misleading, as you don't mention alkynes once in this video.

[@BhavikaVarshneypakhi]

This has been brilliantly explained. Thank you so much!

[@user-ej1nj5ry6l]

My professor's EZ system was not for a man of earth, but here, I got my EZ system now

[@sitizuhairahzainuddin456]

I'm a pharmacy first year student and I found this video. It's very useful. Thank you very much!

[@Isomei]

Siti Zuhairah wow! Good luck i hope to be like you 💗

[@KamalKumar-ik2op]

Siti Zuhairah who cares if you're pharmacy student or not

[@j12825]

don't you need to know orgo to take pcat? how did you make it to pharm school without knowing these?

[@cornationboot8690]

@@KamalKumar-ik2op well i care

[@LinhTruong-jk8zq]

awesome, this's so helpful, I can barely understand anything till I found your video explanation

[@mohamedhommeida2854]

Zank you Zo much zir, Zith waz very helpful!

[@paulinahambata3271]

😂😂zee what you did there

[@MsAbby.3]

My lecturer could never😑 Thanks 🙏🏾

[@ibchemvids]

Thanks for helping me out buddy - I got a bit confused, unfortunately it was in the middle of orgo class :)

[@blessingsmanyawi7468]

Finally the explanation is more clearer ...thanx

[@anitachen-fq3eo]

It's very helpful. Thank you so much! from Taiwan~~

[@xxanimefanxx11]

Does anyone know when the E-Z configurations are not applicable. I'm studying for my first o chem exam and one of the questions on the review exam is determine which descriptive phase 1-6 is applicable . 4 is E configuration, 5 is Z configuration, and out of all 5 parts, 4-5 was written down on only 3 of them. SO when do you when to look for e-z configurations, if that makes sense?

[@miaab7143]

Thank you so much, this was so helpful💚

[@dianajasmine111]

very easy to follow with thank you

[@pablovillanueva8006]

thanks for the vídeo, what i didn't understand for a long I've already done in this videos 😁😁💪

[@realsillyC]

Brilliant thank you so much

[@opomina5591]

Awesome course. Thanks a lot

[@TheUser704]

fantastic!

[@hinaziqbal8116]

These videos are best. Helped me a lot.

[@paulinahambata3271]

Finally got this into my head😁 . Thanks#

[@hadassahmutale]

Thank you 😊

[@chemistrywithdryousafzai487]

learning the configuration E-Z now

[@ysrayudu6963]

Thanks for the last example which I want😁😃

[@kaili3477]

If the molecule is cis or trans around the double bond, do we still use the E-Z system? or do we just name it cis/trans. If the molecule with a double bond has 2 of the same group attached to the double bond (right side) from both ends of the symmetry line, but 2 opposite ones (left side of molecule). Can we still use E-Z? Do we name it E or Z? please help

[@imanhamdullah6059]

Amazing explanation!!!!

[@mathophile1912]

Amazing loved it

[@motheommotong1412]

Thank you so much!!!!!

[@bulelwancamani2920]

This is so helpful . All your videos are 😭🙏

[@cebanihlabisa9215]

thank you, very helpful

[@appelmoeseend6018]

Thank you so much!

[@zuikisnostalgia]

I guess I'm the only one who's disappointed at the lack of complexity of the molecules. How about an example where you have a molecule that presents more than a double bond? And how would you draw it if they asked for the skeletal structure?

[@jonathanleitch6176]

zuikisnostalgia if you could be more specific I may be able to help. When you say "more than a double bond" what exactly are you referring to?

[@jonathanleitch6176]

It's also important to note that a molecule with all sigma bonds will have conformational stereoisomerism which doesn't require E,Z nomenclature since rotation around the bond is possible.

[@sairaj3265]

MASTER PIECE!😎

[@Austrogirllive]

Thx for saving me

[@dhiaawad6710]

so helpful

[@sevilla1024]

THANKS 🌼

[@ahadeid768]

keep going! thanks

[@fauzanakhter6690]

Why did the instructor pretend that the carbon was bonded to two oxygens when in actuality it was only bonded to one? Is that how you are supposed to assign priority with other similar molecules?

[@bol3iz]

5:30 why did you add an extra o on the top right side?? C is only connected to one O, not two.

[@rwayle]

It's part of the CIP (Cahn Ingold Prelog) rules which is what you use to determine priorities in E/Z. If there is a double bond you count that as two single bonds to that atom.

[@edgarortiz1640]

So organic compounds with double bonds aways need e z names?

[@fathima8118]

Thank you ❤️

[@boredpotato2176]

So damn helpful

[@witty_me]

great

[@fadheelahfaleel1487]

So whats its final name?

[@swapnaharish9651]

so op

[@breadblock]

i fucking love u

[@skeche]

so no more cis-trans?

[@JS-vo6go]

you talk too fast, its hard to keep up. But otherwise a good video