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Alkyne Reduction - Hydrogenation, Lindar's catalyst, Dissolving Metal Reduction - cis/trans alkenes

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leah4sci.com/al... Presents: Alkyne Reduction - Hydrogenation Reaction and Mechanism
📺Watch Next: Chain Elongation - Terminal Alkynes • Chain Elongation via A...
Need help with Orgo? Download my free guide ’10 Secrets to Acing Organic Chemistry’ HERE: leah4sci.com/or...
This video walks you through the 3 types of alkyne reduction reactions including alkene to alkane, and alkyne to cis and trans alkene using a Lindlar Catalyst and Dissolving Metal Reduction including a step by step walkthrough of the radical reduction mechanism using Na NH3.
In this video:
[0:06] Alkyne Reduction Reactions
[2:11] Mechanism for catalytic alkyne reduction
[5:09] Lindlar's catalyst to cis Alkene
[10:00] Dissolving metal reduction to trans alkene
Catch the entire Video Series Along with the Alkyne Practice Quiz (coming soon) and Cheat Sheet on my website at leah4sci.com/al...
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Опубликовано:

22 авг 2024

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Комментарии : 87

@laelblass9560 10 месяцев назад

Leah4Sci does it again! I have been struggling to understand this for a week and now 15 minutes later I finally do! Thank you!

@Leah4sci 10 месяцев назад

Wonderful! You are so very welcome!

@hassanmarwat5723 4 года назад

I didnt know that how a lone pair forms bond with hydrogen But u explained that the nitrogen N takes both the electrons involved in N-H bond so hydrogen is not left with any electrons thats why it forms a bond with lone pair.... Really appreciate that 😊

@Leah4sci 4 года назад

You're very welcome!

@wumaster1 3 месяца назад

I like how you used different colors to help visualize the movement of the electrons and atoms. That's why I now follow your habit and use colored pens to take notes. 😃

@Leah4sci 3 месяца назад

I love using color; it find it so much easier to see and understand. So glad it's helping you, too!

@AR-vb4xy 4 года назад

These videos are gold!

@Leah4sci 4 года назад

Thanks!

@PunmasterSTP Год назад

Or are they Pt, Pd or Ni? 😎

@nathanm8234 3 года назад

Thank you very much for the clear explanation. Subscribed!

@Leah4sci 3 года назад

You're welcome! Thanks for the sub!

@cedricksikuku3011 4 месяца назад

You are the best tutor , I like the way you teach

@Leah4sci 4 месяца назад

I appreciate that, thank you! I'm so happy to help.

@user-xx5ce5rn7x 11 месяцев назад

Hello ma'am, I am preparing for NEET Examinations (Indian entrance examination to enter medical colleges), organic chemistry plays a very vital role and you made me understand the topic easy... Thanks

@Leah4sci 11 месяцев назад

You're very welcome!

@PunmasterSTP Год назад

Dissolving metal reduction? More like "Delightful videos; thanks for them!" 👍

@Leah4sci Год назад

Glad you like them!

@PunmasterSTP Год назад

@@Leah4sci For sure; they’re hydrogenawesome!

@TanishqSrivastava 3 месяца назад

Wonderfully explained.. thanks

@Leah4sci 3 месяца назад

You're so welcome!

@hassanmarwat5723 4 года назад

Thank you teacher 😊 it was very helpful

@Leah4sci 4 года назад

You're very welcome!

@mahanteshramannavar8242 4 года назад

Mam which one can undergo addition reaction most readily; Alkene Or Alkyne?..

@Leah4sci 3 года назад

Thanks for asking. Alkynes undergo hydrogenation reactions and nucleophilic addition reactions more readily than alkenes.

@mattpatrocinio7578 Год назад

Thx for these videos ur better than my professor

@Leah4sci Год назад

Glad you like them! I'm always happy to help.

@star-sq9mc 4 месяца назад

Amazing explanation❤ I felt problem in understanding reaction of na in liq ammonia

@Leah4sci 2 месяца назад

Glad you found it helpful, what about the reaction of na in liq ammonia did you find difficult to understand?

@healthid6519 2 года назад

Thank you so much for this information 👍👍👍👍👍❤️❤️❤️❤️❤️

@Leah4sci 2 года назад

You're so welcome!

@ab_khanayy 6 месяцев назад

love this!!!! Understood it so easily thank youuu :)

@Leah4sci 6 месяцев назад

You're so welcome!

@kinzazafar336 5 месяцев назад

very well explained

@Leah4sci 5 месяцев назад

Glad you think so!

@evilsgamingyk2566 15 дней назад

Tommorow is my exam Thanks 😘

@Leah4sci 14 дней назад

You're welcome and best of luck!

@watsoncrick6071 3 года назад

Hey, your videos are awesome. I am a bit confused over why we use palladium or nickel for every reducing reaction. Can you please help me out? :)

@Leah4sci 2 года назад

You can use other metals too

@anissabahkani2882 3 года назад

Amazing explanation!

@Leah4sci 3 года назад

Glad it was helpful!

@narasimhagosu465 5 лет назад

Good video and Can you give me some videos on reduction of acids

@Leah4sci 5 лет назад

Thank you. PLease check my channel

@tamjeedzawan6554 Год назад

QUEEN part 3

@Leah4sci Год назад

@learnchemistrywithshehzad2938 Год назад

A million dollar video

@Leah4sci Год назад

WOOHOO!!!

@Ryan-fi2ul 4 года назад

in what situation would you use 2H2 ?

@Leah4sci 3 года назад

Great question! You use 2 moles of H2 as a reagent when performing a catalytic reduction of an alkyne to an alkane. This is because completely reducing all of the triple bonds in the sample to single bonds would require a 2:1 ratio of H2 to alkyne.

@casualcasual1234 2 года назад

Hello so overall reaction of trans alkene formation consumes 2 eqv Na & 2 eqv NH3?

@Leah4sci 2 года назад

Yes, per every one mole of alkyne that is reacted.

@casualcasual1234 2 года назад

@@Leah4sci oh thanks a lot

@tysonsmat9918 11 месяцев назад

Instead of radical breaking, can we not visualize that the single electron attacks the alkyne carbon from the back (antibonding orbital) in SN2 fashion pushing the lone pair in the oppsite side to adjacent carbon as the original carbons bonding orbital changes to anti bonding one. In short a SN2 attack by a single electron on alkyne leading to trans lone pair - radical alkene intermediate.

@Leah4sci 11 месяцев назад

This is too complex of a question for a RU-vid comment. I stand by the accuracy of the mechanism in this video. If you would like to ask further questions, draw your proposed mechanism and send it to me through my website, along with your question, at Leah4sci.com/contact

@hajarrayhanaelaqil1988 2 года назад

you're the best that's all I have to say

@Leah4sci 2 года назад

Wow, thanks!

@hajarrayhanaelaqil1988 2 года назад

@@Leah4sci my pleasure

@KRISHNENDUJANA24 4 года назад

Yeah trans radical is more stable but how can a double bond rotate ?

@Leah4sci 3 года назад

The double bond is not rotating. It’s more of a question of where the electron cloud containing the radical will gravitate. Non-bonding electrons (like the radical) are not tied down in space. According to the rules of VSEPR theory, it will choose to distance itself from the newly-formed lone pair as much as possible. Thanks for watching and asking!

@derrickdot2298 Год назад

What of in a situations where you nees to have an alkene with 2 double bonds? How does it go

@Leah4sci 11 месяцев назад

How does the mechanism go? Unfortunately, I don't offer tutoring over social media. For help with questions like this and more, I recommend joining the organic chemistry study hall. Details: leah4sci.com/join or contact me through my website leah4sci.com/contact/

@mobalegend3805 3 года назад

if alkenes can be reduced to alkane does alkanes can be reduced to alkens?

@watsoncrick6071 3 года назад

alkanes can't be reduced...reduction is addition of hydrogens.. there's no more space in alkanes to add some more hydrogens.

@Leah4sci Год назад

Agree with the other comment. Alkanes cannot be further reduced. There is no position for additional hydrogens to be added.

@hannahk6117 2 года назад

why does H2/Pd fully reduce the alkyne chain ??? why cant it stop at an alkene

@Leah4sci 2 года назад

The short answer: It is too strong of a reducing agent to stop at the alkene. We do have other methods of getting the alkyne to an alkene, namely H2 with the Lindlar's catalyst. Make sure to take a look at my redox cheat sheet at leah4sci.com/orgo-oxidation-reduction-reactions-study-guide-cheat-sheet/

@mirafzal9052 Год назад

Good mam

@Leah4sci Год назад

Thanks a lot

@calenolsen 5 лет назад

3:35, where do the blue hydrogens come from?

@Leah4sci 5 лет назад

Hydrogen is required for this reaction, typically added in the form of H2 gas. H2 will first bind to the metal catalyst.

@sadiakaramat8835 2 года назад

Awesome Mam

@Leah4sci Год назад

Glad you liked it, thanks for watching!

@sadiakaramat8835 Год назад

@@Leah4sci Yours welcome😊

@abidaliajiz Год назад

Great 👍

@Leah4sci Год назад

Thank you!

@eman4159 5 месяцев назад

Queen.

@Leah4sci 4 месяца назад

Thanks!

@hwiatslgeord2887 2 года назад

What is the exact composition of lindlar reagent

@Leah4sci 2 года назад

Its primary make-up includes palladium metal. However, its composition is not required knowledge in most orgo classes. As long as you know WHAT the Lindlar catalyst does and what product it would create in a given reaction, you should be in good shape.

@hwiatslgeord2887 2 года назад

@@Leah4sci thanks 😊