Great video explaining these reactions! My professor tends to lose me by going into too much detail and forgetting that we are not all professionals in OCHEM. This video gives me exactly what I need to know about each reaction in a simplified manner! Thank you!
So many professors forget that the reason they have students is that it is their job to teach chemistry to those who don't yet know it! I'm glad my videos are able to fill in where your professor is unable to
This was so great! It eliminated the need to review all the videos (that I have already watched several times while learning the concepts), in a compact, "remember these" concepts way. Perfect for day before finals review!
she is doing great, some of us cant afford to pay for you tube videos, for example me, am very poor from the most poor country. so stop influencing her that we should pay for her videos.
I know that this is an older video, and I don't know if this channel is really active anymore, but this video is honestly going to be my saving grace for the exam I have tomorrow. Thanks, Leah!!
This was ABSOLUTELY amazing! Someone in my organic chem group sent this video to the gc and I was happy to watch it! With the situation of COVID my class has been stuck online and it is really hard to understand or ask for help... So, this video really helped out. Thank you!
You are the best. I'm on the chapter of Reactions to Alkenes and it's a huge chapter to read. We have the powerpoint slides but the professor just goes through each slide which makes it hard to understand. Your video pretty much summed up most reactions that we reviewed in class. But now, I have a better understanding.
Thank you so much Leah, You are amazing. Your videos help a lot to understand the difficult concepts of Organic chemistry. I am watching all of them and this video is a summary for many chapters in my textbook. Thanks again and God bless you, wish you all the best Leah!
Thank you so much, our professor started this chapter on the last week of class. By watching this video before every class, it allowed me to get more familiar with the material and gradually add the mechanisms behind the results as they were discussed in class.
My Organic professor is terrible. Reads straight out of the book on an overhead and never works out any problems. Also makes you feel stupid if you ask for help. THANK YOU SO MUCH for these helpful videos. It's hard to teach yourself organic chem out of a textbook.
Couldn’t believe I just found ur video this is very clear and helpful! I’ve been struggling with the products of these reactions now you’ve cleared my doubts thank you so much
I don't have a video dedicated to the nomenclature of molecules with chiral centers. However, you will find these topics addressed in my free Chirality and Stereochemistry series where I walk you through how to identify R and S configurations for chiral molecules. Watch the series at Leah4sci.com/Chirality
Thank you! I‘d be interested in hints at why and how a step can go wrong and the risks involved with specific reactions. I understand that is more than is asked in most chemistry education but it is very relevant in daily practice. I really like your colour scheme, we both share a trait 😉
I'm sure it's relevant in daily practice, but alas it is not something I can help with. I'm strictly a pen & paper chemistry tutor, I haven't been in lab for over a decade
4:20- In another video, she explained that this is due to the polar bond formed between the H and O which gives the H a partial positive charge and negates it
***** Thanks. I know I failed though, but now that i'm aware of your channel since few days ago, I will actually be able to learn the concepts next term. =)
From a stereochemical perspective, oxymercuration is an anti addition. This has to do with the formation of the mercurinium ion as an intermediate. The nucleophile cannot attack from the same side as the mercury because of steric hindrance. If you’d like to further break down any statements from your textbook, I’d love to do so in my Organic Chemistry Study Hall. For more information, go to studyhall.leah4sci.com/join
Im not sure if you realized but you contradicted yourself for the halohydrin. you mentioned that the halogen goes to the less substituted (markovnikov because more H bonds) but then you said that this is a markovnikov reaction because the solvent without the H adds to the more substituted carbon which is the opposite of markovnikov.
Thanks for watching and for your comment! I do not believe I contradicted myself. Halohydrin formation is a Markovnikov reaction because the nucleophile (in this case, the polar protic solvent) adds to the more substituted carbon. It is the solvent, not the halogen, that adds last in the reaction mechanism. For the complete breakdown of the reaction mechanism, visit leah4sci.com/halohydrin-formation/
How do I know if a reaction will do an anti markovnikov addition or a markovinkov addition? Is it just purely memorizing which reaction does what or is there some trick
To understand why any given reaction produces a Markovnikov or anti-Markovnikov product, you must understand something about the reaction mechanism itself. Determining the favored product of the reaction is really all about identifying the reaction intermediate. In short, Markovnikov reactions usually have highly stable carbocation intermediates, while anti-Markovnikov reactions do not show a carbocation intermediate. For more on this, visit my tutorial at leah4sci.com/markovnikov
Very good but only one question.... In the hydrohalogenation example, isn't the Cl going to go on the C that has the less H, being a Markovnikov reaction? Why does the Cl go on a C that has no pi bonds?
Listen to my explanation in the video one more time. For this example, there is a hydride shift that allows the carbocation to be formed on the more substituted, tertiary carbon. For more on the mechanism of a hydride shift like this one, I invite you to watch the following: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-cSW9LDxtuoA.html
Hello, could you please explain to me the meaning of some substances written on reaction arrows, such as Zn-Hg, Zn(Hg), Zn-H2O, EtOH/H2O, BH3·THF? What do the parentheses (), dot (.), dash (-), and slash (/) signify in these cases?
Your videos are just mind blowing and amazing. Can you please make videos providing cheat sheets for chapters like carbonyl compound, carboxylic acids, phenols and ethers?
everything was purely explained and thnc for clarifying some tricky things. But mem i only have ONE PROBLEM "HOW DO YOU SEE IF YOU AN HYDRIDE SHIFT"??????
Glad I helped clear things up for you. Regarding your questions, a hydride shift can occur in organic chemistry reactions that involve a carbocation intermediate. If such a rearrangement will place the carbocation on a more substituted carbon, then the hydride shift is highly favorable because of its ability to stabilize the intermediate. For more, visit leah4sci.com/hydride-shift-mechanism/
I love your videos but I seem to need some background to understand this one because I could not be more lost. What is the prequel to this video? I was following the playlist/series..?
Think of this video as a short summary of all of the other alkene reactions presented in the series. As such, I would watch this video either first (as a preview of what’s to come) or watch it last (as a quick review of everything). For the entire series, in correct order, visit my website at leah4sci.com/alkene-reactions
In this case there is no carbocation intermediate. The nucleophile (H2O) attacks the delta positive carbon on the bromonium. Because there's no true carbocation, no rearrangement
There's no 'free' carbocation in this reaction. Instead it's a partially positive carbon held in place by the bromonium. OH is attracted to the partially positive carbon and IN attacking, breaks the carbon-bromine bond. Without a free carbocation there is no shift
Hi! I was wondering why there is a hydride shift in the hydrohalogenation, but not any of the others shown given that true same alkene is being used in each mechanism. Doesn’t each alkene reaction exhibit a carbocation intermediate, and if so, why do the other examples not go through a hydride shift?
I'm sorry, but 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/ You can also view my free Alkene Reactions video series and cheat sheet at Leah4sci.com/alkene
quick question, so these are just different ways/methods in breaking an alkene? because if so, these different ways can also be used with organic synthesis reactions? btw, your videos have helped me so much! so thanks for posting these great videos :)
Actually, no. The formation of the halonium ion intermediate prevents the possibility of a carbocation rearrangement. For more on this reaction, watch my video at ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-S-2CaHDhMfI.html
