I just graduated with my undergrad and I had never thought of the different spatial orientation view... The way you explain things makes so much sense! Thank you!
I was having issues with spacial imagination until I saw you look at the hydrogen and imagined it in the back and then you could see all the 1,2,3 priorities in the plane. Thanks so much!!
Not exaggerating but I swear down, your videos are sooooo much easier to follow and understand. You just seem to make all the pieces fit together! Thank you a million times over for your videos, they are saving my sanity! 😂
Built a tetrahedral stick model out of tape pencils and got the answer. This RN is learning to better see the carbon chains. Thank you Professor Dave. Subscribed, liked and learning.
I had been spending hours figuring out R and S and the E and Z config!!! But prof Dave.. You have saved my day.. Your videos are super cool and way way easier to process mentally than the hours of lectures i have heard.. Thank you sir❤
the fact that my profs try to make us waste our time building every molecule to assign R and S is absurd - thanks so much for this new technique, it's so much more efficient!
You might have just saved my grade in bioorganic chemistry! Thank you so much! And yes, I hit those like AND subscribe buttons like they just did unspeakable things to my pet! Thank you again, all the way from Vienna!
Hello Dave Sir, NAMASTE 🙏🏻 I am Ruchika, *your* Student from India. I literally love your videos. They are so rich with knowledge and good explanation. I am preparing for MEDICAL COLLEGE ENTRANCE EXAM and I am a bit weak at chemistry. I just want to say that I find your lectures amazing and they help me a lot. Thank you. 😊
Professor Dave Explains but if they do not give where the wedge bond and dash bond is how would I know whether the hydrogen is in the front or back of the compound
thank you so much. I have looked everywhere until i got you. this explains my predicament. I knew the wedge or dashed hydrogen but when in the plain the textbook I use said nothing about it. Thank you so much
your methods are so much easy to connect n the way you explain stuff is just amazing.Thank you prof. Dave u have been Very helpful to understand complex stuff easily n effectively.👍
i simply remembered 2 acronyms: ACR and TCS.. to elaborate, if the lowest priority group (usually H but not always) is away from me and i count the groups in a clockwise order, then the molecule is designated (R). If LPG is towards me and it's clockwise then it's (S). idk if that helps
i know a mnemotechnic help with the r/s. if you have the substituent 4 already away, picture yourself turning a car. the molecule is steering wheel and you turn it from 1 to 2 and then 3. if your imagined car is going right, it's R, if left, it's S.
Shouldn't the original one be R? Cuz the Ethyl is to right, so H-H-H < H-H-C, like in last problem, the one with CIP convention? Please tell me if I'm going way too far from the point.
Now the only question left to be answered, why can't more o chem proffs be as logical, sensible and easy to comprehend as this? The world may never know. The most trivial underlying question in 99% of college students = "why must he/she make an already difficult subject of study, twice as difficult?" Thanks Professor Dave
there's also another trick it can help you guys to get the right absolut configuration which's if you've a pair number behind ( in back ) you'll assign directly ( clockwise ) if you've an impair number in back then you'll assign inversely ..
For the last molecule, its easier to just change the 3D perspective than re-arrange the atoms. Simply imagine a stick with 3 balls stuck to the end, and rotating the stick makes the balls rotate with it. Now rotate it until the H-Ball is in the back, and count priority from there. Now you don't have to flip the rules, since you did not change the molecule and you still get the same answer: S.
hello professor dave, good lecture but i have some my questions, 1)why do we rank the atom with the highest atomic mass as priority number 1, 2)why do we always put the atom with the lowest priority away from the us? would appreciate if its answered.
actually i made an error, it's atomic number, not mass. but it's all arbitrary. it's just a set of rules we all follow so that we all agree on how to designate things.
2:52 #3 is a methyl group which has a crbon, how is it not #2 bc of the extra hydrogen? if its cause ethyl is taken as a whole ur not saying it. that be CH3 vs CH2+CH3
No it's one atom at a time, so C and C tie, but the ethyl carbon is attached to CHH, while the methyl carbon is attached to HHH. C beats H so the ethyl direction wins.
okay what he told was write but in first case of hydrogen and bromine in that method we don't really need to redraw the structure again. keep the hydrogen in wedge and do the numbering and simply revert the answer
Need OChem help? Find me and all the resources you need on Chemmunity: chemmunity.info/dave
Not to be dramatic but you are literally saving my life right now
So does for me too!!!
So does for me 😜
4 years and he is still saving our lives
I learned more in this 10 minute lecture than the 3 hour lecture in school.
hey r u from America?
Omg its true
Totally agree
Absolutely true 💯
I totally can relate with you ... but you know whenever I dont understand a concept at Uni, I don't why I blame myself 😂
I just graduated with my undergrad and I had never thought of the different spatial orientation view... The way you explain things makes so much sense! Thank you!
Best chemistry teacher on youtube so far!
And the organic chemistry tutor...... He is solid too
Not so far, he is forever ♾️
"Thanks for watching, guys"....no, thank YOU
SAME
The amount of views is waay lower than it should be, you are great at explaining concepts. Also, nice hair!
I was having issues with spacial imagination until I saw you look at the hydrogen and imagined it in the back and then you could see all the 1,2,3 priorities in the plane. Thanks so much!!
You are fantastic! Helped me alot pass my organic chemistry exam. This channel needs more attention!
tell your friends!
Oh
Holy crap this contents amazing. Please keep making these, easily the clearest and most concise chemistry tutorials online.
Not exaggerating but I swear down, your videos are sooooo much easier to follow and understand. You just seem to make all the pieces fit together! Thank you a million times over for your videos, they are saving my sanity! 😂
Built a tetrahedral stick model out of tape pencils and got the answer. This RN is learning to better see the carbon chains. Thank you Professor Dave. Subscribed, liked and learning.
I had been spending hours figuring out R and S and the E and Z config!!! But prof Dave.. You have saved my day.. Your videos are super cool and way way easier to process mentally than the hours of lectures i have heard..
Thank you sir❤
Thank you honestly. I just watched your isomers series and it helped me more to understand what a university proffessor couldn't explain correctly.
HOLY FUCKING SHIT FINALLY A WAY TO ASSIGN R AND S WITHOUT CONCEPTUALIZING!!!!
Literally this is the greatest channel to ever exist. It is saving my o chem grade because I am ACTUALLY LEARNING SOMETHING!
You are the best orgainchemisty teacher ever. You had save my life and grade.
I've seen many of your videos they are all to the point .Easy to understand . You explain very well that it leaves me with no confusion .
Thanks Dave! You really have helped me over the years! You are a TON better than Crash Course!
Hope Crash Course doesn’t see this comment🫣
the fact that my profs try to make us waste our time building every molecule to assign R and S is absurd - thanks so much for this new technique, it's so much more efficient!
You might have just saved my grade in bioorganic chemistry! Thank you so much! And yes, I hit those like AND subscribe buttons like they just did unspeakable things to my pet! Thank you again, all the way from Vienna!
You have explained the Cahn-Ingold-Prelog convention well, my dear Prof Dave! Thank you so much!
Once again beautifully explained and a perfect refresher to come back after a long time out of OC. Thanks so much!
I thank you from the bottom of my heart
I can't believe it's that easy! You explained in a single video a concept that boggled me for an entire semester
Wow, this was super helpful!! The way you explained it and made it so simple makes me feel dumb for not getting it in the first place😂
Thank you so much! I clinched my test in Organic Chemistry few hours ago. I am the top-scorer. I love you so much!💗
Hello Dave Sir, NAMASTE 🙏🏻
I am Ruchika, *your* Student from India.
I literally love your videos. They are so rich with knowledge and good explanation. I am preparing for MEDICAL COLLEGE ENTRANCE EXAM and I am a bit weak at chemistry.
I just want to say that I find your lectures amazing and they help me a lot.
Thank you. 😊
Do you got it?
This helped so much. I spent a lot of time on Khan Academy trying to figure this out.. I'll come here first next time. Thanks!
I feel like i just found solid gold, thank you so much Professor Dave, still saving grades even 8 years later 😂
you really deserve to be called "chemistry god".
Thank you
Chemestry jesús
Thanks Prof Dave! I am taking an online Chem course and you have been extremely helpful.
happy to be of service!
Professor Dave Explains but if they do not give where the wedge bond and dash bond is how would I know whether the hydrogen is in the front or back of the compound
prathyush srinivasan good question, you can't! some kind of three-dimensional notation must be used to assess stereochemistry.
Professor Dave Explains oh okay
OMG, I can't explain, how helpful was that😭
Very Thankful to you sir🙏🙏
I watched this video when I was in organic chemistry class 5 years ago. Now I still watch this video to revise the lesson. Love you Professor Dave ❤️
You are a Genius! Studying Pharmacy can be tough, but you just made it a bit easier. Thank you and greetings from Vienna! :)
Cool - I will start studying pharmacy in Vienna in one week :)
9 years and you still saving our lives
my professor exmplained something about swivelling a double bond and it went straight over my head, this is so much easier to get
thank you so much. I have looked everywhere until i got you. this explains my predicament. I knew the wedge or dashed hydrogen but when in the plain the textbook I use said nothing about it. Thank you so much
It's so much easier the way you break it down. Thank you soo much !
U r just making me in love with the topic when my lecture sucks 💕💕 thnx a lot sir 💙
Your videos have helped enormously over the years, I am very grateful.
your methods are so much easy to connect n the way you explain stuff is just amazing.Thank you prof. Dave u have been Very helpful to understand complex stuff easily n effectively.👍
Keep up these videos! You have no idea how helpful and relieved I am to understand this now :D
7:40 U can flip between the other 2 groups ( right and left) as well at the same time.
No one taught me that I can arrange the molecule specially, everyone sticked to the cheat method and that confused me a lot, thank you
I learned with you more easier than how my Prof. trying to teach us. OMG thanks a lot
Love from Türkiye
man youre great watching you for like 3 years
3 hour lecture of my bad professor which was painful to try and understand, summarized in 11 minutes. Thank you Professor Dave!
cannot be more thankful prof ..
8:10 thanks I’d never thought of it like this
8:15 It will be easier to make its Fischer projection and make a odd exchange and by fixing Cl then Hydrogen will be assigned furthest away from us.
watched a days worth of r/s configuration, I think this is the best method
awesome, helps me in first year med school switzerland :)
i hope proffessor Dave is having the most wonderful day
My God , I have my exam today and thank you for saving my time , You are the best!!!!
This Puzzled me from last three days but after watching ur video I resolved it ... thanks sir
I have an exam tomorrow and you really assisted me
this guy is the best at explaining
Extremely high quality again.
i simply remembered 2 acronyms: ACR and TCS.. to elaborate, if the lowest priority group (usually H but not always) is away from me and i count the groups in a clockwise order, then the molecule is designated (R). If LPG is towards me and it's clockwise then it's (S). idk if that helps
Thank you, you literally saved my life !!! You make it look so easy! Wonder why they don't teach us that in school..
Damn. It took him just 11 minutes to explain an hour long lecture.
you made my chem configuration very comfortable...
"I just wanna stress the fact.."
I'm already stressed rawrawrawwwr but thank you Professor Dave
Organic chemistry makes no sense to me
U passed?
Maybe passed away?
@@pokemoner_365 you did
😂 need to understand it from a teacher who explains the meaning of organic chemistry only then makes sens
I don't understand where they are getting this imagination from,
i know a mnemotechnic help with the r/s. if you have the substituent 4 already away, picture yourself turning a car. the molecule is steering wheel and you turn it from 1 to 2 and then 3. if your imagined car is going right, it's R, if left, it's S.
2:50 is the reason im here, never got that thank you so much..
This is truly amazing.
Thanks a ton for this.
Shouldn't the original one be R? Cuz the Ethyl is to right, so H-H-H < H-H-C, like in last problem, the one with CIP convention? Please tell me if I'm going way too far from the point.
why are this guys free youtube videos more educational than my paid for college class
Now the only question left to be answered, why can't more o chem proffs be as logical, sensible and easy to comprehend as this? The world may never know. The most trivial underlying question in 99% of college students = "why must he/she make an already difficult subject of study, twice as difficult?" Thanks Professor Dave
Amen! I feel you. Tell your friends!
Thanks for clarifying the priority system.
Very helpful Prof Dave! Loved it!
you my good sir, are a true legend
i really liked the method of orienting myself in the plane and see the structure. and get the answer quickly
best chemistry professor ever!!!!!!!!!!
there's also another trick it can help you guys to get the right absolut configuration which's if you've a pair number behind ( in back ) you'll assign directly ( clockwise ) if you've an impair number in back then you'll assign inversely ..
Best explanation ever. Thanks Prof.!
At 9:00 shoudn't it be F-Cl-Br? Resulting R as an answer?
Can I just say how useful these are for me
Thank You, Professor Dave. For many things, but today, for teaching me chemistry as my professor I paid can't seem to explain it.
you have less videos but the ones you have made are small and perfect thanks your awesome!!!!
by far the best
ur teaching is so much effective ...thnx sir
You saved my future really
For the last molecule, its easier to just change the 3D perspective than re-arrange the atoms. Simply imagine a stick with 3 balls stuck to the end, and rotating the stick makes the balls rotate with it. Now rotate it until the H-Ball is in the back, and count priority from there. Now you don't have to flip the rules, since you did not change the molecule and you still get the same answer: S.
hello professor dave, good lecture but i have some my questions,
1)why do we rank the atom with the highest atomic mass as priority number 1,
2)why do we always put the atom with the lowest priority away from the us?
would appreciate if its answered.
actually i made an error, it's atomic number, not mass. but it's all arbitrary. it's just a set of rules we all follow so that we all agree on how to designate things.
@@ProfessorDaveExplains ok thanks.
Great content as always. Thanks for all your videos!
Important point at 2:49
Sir, you are a great teacher.
2:52 #3 is a methyl group which has a crbon, how is it not #2 bc of the extra hydrogen? if its cause ethyl is taken as a whole ur not saying it. that be CH3 vs CH2+CH3
No it's one atom at a time, so C and C tie, but the ethyl carbon is attached to CHH, while the methyl carbon is attached to HHH. C beats H so the ethyl direction wins.
Your explanation is super easy to comprehend and super nice!
Thanks prof.!
i finally can pass my exams now lol XD
i was so confused when I learned this in class but now am like ohhh
I wish I could meet you in-person. You’re the best!
At 3:36, why wouldn’t the left hand methyl group take priority? Isn’t it C,H,H,H?
the carbon is attached to H, H, H, whereas the carbon to the right is attached to C, H, H
Why doesn't he just redraw the molecule as it would look from behind the board with H facing away ? 6:49
okay what he told was write but in first case of hydrogen and bromine in that method we don't really need to redraw the structure again. keep the hydrogen in wedge and do the numbering and simply revert the answer
he is absolutely legend
You're a lifesaver
Thank you so much sir it was very useful...I was confused with this but now everything is absolutely clear...Thanks a tonne for this vedio