E1 vs. SN1 Comparison

[@TheBekahandLynnlee14]

I have been having so much trouble in my O. Chem class, because my professor doesn't teach the class. I have been having to teach myself the subject, and these videos have helped me SOOOOO much. Thank you! : )

[@phillipdoan9919]

My professor doesn't teach either. I think it's normal for O.chem. I have to spend so much time on KZbin and reading the book myself.

[@Sweetie0325canflyy]

You have no idea how helpful this short video is... TYSM

[@angelimar993]

this was so helpful! thank you from the bottom of my heart!

[@AbiLedezma]

Thank you so much from Venezuela! greetings.

[@tomhermens3565]

Does the exception you mentioned last also apply to secondary alcohols?

[@giofer7303]

hey i have a question if the SN1 mechanism rate is independent of the nucleophile then why doesnt the hso4- attack the carbocation anyway?

[@MasterOrganicChem]

gio fer The HSO4- anion is quite resonance stabilized and it is a very poor nucleophile, certainly not as good as water.

[@1856PA]

Hi MOC, I'm not sure I understand the plot at ~5min. Specifically, y-axis.. is it rate or products? It's labeled as rate but also referred to as %-yield? I believe your rate(s) are the slopes of the curves: (change in %-yield/change in temp)

[@MasterOrganicChem]

Ah, it's marked Rate, but should be % composition. At low temp, expect 80/20 SN1/E1, versus high temp about 20/80 SN1/E1. Does that make sense?

[@1856PA]

Master Organic Chemistry ok, so it is "% of products per mechanism" ?

[@MasterOrganicChem]

Yes - product mixture. Roughly 80/20 SN1/E1 at low temp, crossing over to roughly 20/80 SN1/E1 at higher temp. This is a generalization but higher temp favours higher E1/SN1 ratios

[@MrRanol1234]

Sir, your videos are awesome ! thank you so much, and hello from Israel (:

[@danalorayni4570]

I have a small question ..Does all tertiary with strong acid prefer the elimination reaction or is it just in this example specifically ???

[@MasterOrganicChem]

Around 6:15 I draw an example of a tertiary alcohol with H2SO4. The choice of acid is important in promoting elimination vs substitution. The conjugate base of H2SO4 is HSO4- which is a poor nucleophile and unlikely to attack the carbocation, and elimination is much more likely. This is in contrast to HCl, HBr, or HI which will likely result in substitution of OH for the halide (Cl, Br, or I). Heat will also favor elimination versus substitution.

[@muntahaali9092]

Did you mean, "So one exception to ELIMINATIONS being favored over SUBSTITUTIONS?" instead of the opposite.

[@ks-xh4fq]

very helpful, thanks

[@MasterOrganicChem]

Thank you! If this video was helpful, you may want to check out our month-to-month MOC membership for access to over 1500 quizzes, Flashcards, the Reaction Guide, and more. Check it out here: bit.ly/2YctxPb

[@nvdb4689]

Why is it that when the nucelophile/base is weak, the Sn1 is favored over E1?

[@donloke5102]

Sir I am from India I was stunned by yr explanation Awesome!!!!!!!

[@Mirrrh.1]

Thanks sir

[@pratyushjoshi9633]

Thankyou love from India

[@jimmyraina1438]

rehn de bhaye tu