Orgo fucked my virgin asshole

[Anonymous No.10189260]

How the fuck do I memorize 6 reactions and 4 reaction mechanisms by Friday morning? This includes the enzymes and arrows.

I also need to know what makes shit a part of a molecule acidic and basic but there's virtually no rules on this sort of thing. PLEASE HELP ME /sci/ I CAN POST JEZEBELS IN RETURN

[Anonymous No.10189271]

The first Jezebel I'll give for free

[Anonymous No.10189289]

>>10189260
>guys I’m boarding my plane to japan next Friday how do I learn their alphabet
As a procrastinating faggot that was in your place before. You’re fucked

[Anonymous No.10189320]

>>10189289

[Anonymous No.10189333]

>>10189260
If you really need to do rote memorization fast, the Method of Loci actually works.
I have a terrible memory and I can memorize a deck of cards with it in a little over five minutes (okay nowadays 10 mins since I'm rusty)
I've never tried it for chemistry, and it might take some time and cleverness to design an efficient visual mnemonic system to represent the basic vocabulary of whatever you're memorizing, but I can tell you that the method of loci works.

[Anonymous No.10189712]

It's over man just relax there's nothing you can do.

[Anonymous No.10189722]

>>10189260
>doesn’t have any curiosity so mechanics underlying composition of biomolecules and molecular interactions never became intuitive
>poor pattern recognition skills compounding on this with subpar spatial reasoning
>hehe im sure these big brains can at least boost me to a C-
>ill coax them with pictures of women they can’t fuck i stole off da internet

[Anonymous No.10189723]

>>10189260
Better than going to fucking work

[Anonymous No.10189747]

>>10189260
You grab Anki's dick and suck it dry real good like your life depends on it

[Anonymous No.10189770]

>>10189260
I was going to write a really condescending post shitting on you, but I'll be gracious because people have cut me a break in academia before. Just stop posting degenerate pics; wholesome fully clothed pics of cute white and asian women only from now on.
What are the heck are you studying that requires you to know mechanisms for enzyme reactions when you don't even understand acidity/basicity properly? Sounds like it's probably low level biochem rather than ochem, which is good news for you. First of all, what are the 6 reactions and what are the names of the 4 mechanisms? This is something you can absolutely learn well in 2 days + the time left tonight.

[Anonymous No.10189795]

>>10189260
Prep for Anal Chem
(Analytical Chemistry)

[Anonymous No.10189911]

>>10189770
Sorry I put away my computer while I was studying and got some food. Basically it's alkene reactions, addition of acids, halogenation, X/OH, X/OR, Oxymercuric Reduction, Hydroboration, Dihydroxylation, Ozonolysis, Hydrogenation, and basic alkylation. We only have to know the mechanisms for the first 4 but for everything I need to know if what stereochemistry them produce as well as the catalysts needed.

Do you have any tips on how to rank acids/bases? I don't know whether resonance, size of the atom, or inductive effects is the most important.

[Anonymous No.10189996]

>>10189260
Try memory cards, no other way we can help you, it seems plain easy,...

Shitpost here about the reactions if you cant get to them over shitposting.

[Anonymous No.10190015]

>>10189911
Oh ok so this is early orgochem not biochem.That list gives me anxiety realising how little I remember, but I got As all throughout OChem. My method of study was to work methodically through the lecturer's notes and write out everything important for each reaction: reagents, mechanism, how it works and why, rules to consider about selectivity. You can manage that entire list in a day. Read my own notes once or twice. Then I would do problem sets if you have them, without referring to the notes as much as possible. At the end of each problem set check what you got wrong, and update your notes accordingly. I would also create flashcards for memorisation. If you had started this a week ago you'd be in excellent shape but you still have a good chance at doing well.
For the ranking of acids/bases, can you give me examples? You want to be thinking about which compound can best stabillise the carbanion formed from loss of the proton. So phenol is more acidic than ethanol because the negative charge is stabilised by resonance. Learn to look up pKa to check your hypotheses about acidity. Lower pKa = more acidic. A phenol with an electronwithdrawing group such as -F or -NO2 attached will be even more acidic than phenol itself because of greater stabilisation of the carbanion; on the other hand if the phenol has an electron donating group such as a methyl group (eg 2-cresol) then it will be less acidic, because an electron donating group destabilises the anion.

[Anonymous No.10190017]

>>10189260
Don't memorize, go through and do every problem in every book. If you missed something figure out why you missed it and pay attention for that mistake in the future.

[Anonymous No.10190040]

>>10189911
For these alkene reactions it's very important to understand which side of the double bond the substituents add to. The way to think about it is that during the mechanism electron density moves away (the direction your mechanistic arrow points) from the carbon that is best able to stabilise positive charge, towards the electropositive element of the compound being added. The carbon best able to stabilise positive charge is the one which has the most electron donating/fewest electron withdrawing groups attach. For simple alkenes (with no electron withdrawing groups) this is the most substituted substituted carbon. Remember: the electronegative atom gets added to the carbon which is most able to stabilise positive charge; the electron arrow moves from the double bond, away from this carbon, towards the electropositive element being added.

[Anonymous No.10190044]

>>10189260
>How the fuck do I memorize 6 reactions and 4 reaction mechanisms by Friday morning?
Just keep shitposting on /sci/, that should get it done, you stupid lazy fuck.

[Anonymous No.10190045]

>>10190040
This normally gives you what's called Markovnikov addition, with the heavier atom being added to the least substituted carbon. This is reversed for example in the case of hydroboration because the polarity of H-B bonds is reversed from say H-F: the boron is the electropositive element and the hydrogen is the electropositive element. Therefore the electropositive boron adds to the least substituted carbon.

[Anonymous No.10190071]

>>10190045
Sorry I made a mistake here and got this partially the wrong way around. Correction:

Normal markovnikov addition: the hydrogen (electropositive) adds to the least substituted carbon; the heavy (electronegative) element adds to the most substituted carbon because this is the one most able to stabilise the positive charge created during the reaction mechanism.

Anti-markovnikov addition occurs for example with hydroboration, because the polarity of the H-B bond has the boron as the electropositive element. So B-H gets added to the opposite way as say Br-H, with the B going to the least substituted carbon and H going to the most substituted.

[Anonymous No.10190085]

>>10189911
In terms of strategy I'd say acid addition, halogenation, X/OH, X/OR and hydroboration are the things to learn first because you really need to know and understand the mechanisms for these to be able to do the rest.

[Anonymous No.10190101]

>>10190085
I'm going to go to bed now, but I will check back this thread tomorrow to help you with any questions you might have after studying. By mid afternoon tomorrow you can absolutely have mastered half of this stuff and be getting almost everything correct in those problem sets. Then you have a whole day and a half to learn the rest. Make sure to get good sleep. I believe in you anon.

[Anonymous No.10190102]

>>10189260
Guys, can you help me with understanding these problems? Anyone know why the rates of reaction are changing? I guess it has something to do with the ring size and strain

[Anonymous No.10190106]

>>10190101
>>10190102
Anon pls one more

[Anonymous No.10190108]

>>10190106
If you post the photo the right way around so I don't have to strain my neck.

[Anonymous No.10190118]

>>10190106
>>10190108
And tell me which reaction there you think is slowest before I explain why.

[Anonymous No.10190167]

>>10190118
Too slow faggot, I'm going to bed. Answer >>10190118 and I'll explain tomorrow.

[Anonymous No.10190187]

>>10190108
>>10190118
>>10190167
I assume the last reaction has to be the slowest because 10e-4, but that doesn't make sense since cyclopropane would make me think it's the one that wants to react quickest given how unstable it is

[Anonymous No.10190205]

I'm taking ochem I and II this summer with back to back one month classes but this thread scares me. Any tips boys? It'll be the only two classes I'll be taking so I'll have full focus.

[Anonymous No.10190234]

>>10190187
Is it because it cant get behind the carbon to sn2 it if the ring is small like that?? So the smaller the rings, the harder it is to do SN2 because the smaller the angles, bringing the adjacent carbons closer together and leading to steric repulsion

Is this correct? Can anyone help me with drawing the transition states?

[Anonymous No.10190267]

>>10189260
>>10189333
>>10189996
>>10190017
>his major consists solely of memorizing shit

[Anonymous No.10190268]

>>10190205
Do all the problem sets and write stuff down multiple times

[Anonymous No.10190269]

>>10189911
bro all you have to know is the major product and the rules
Here's what I did
Memorize the Reactants + rules
Most follow simple patterns
For example
Oxy Merc is antiaddition/markov
Boration is syn/antimark
Just inverse
use a basic chart write them out and memorize the reactants + the rules!
for the mechanisms work backwards sinceyou're short on time
just remember not to complicate things
Nucleophile (-) points toward electrophile (+)
Ochem is not as complicated as you think
Memorize the basic groups relative to another
i.e this list
7 strong > HF> Carbox acid > H2S > Phe-Sh > Phenols > SH > Water > alchols > amides > ketones > alkynes > amines > alkenes > alkanes
this is from pka least to greatest/ in other words from most acidic to least.
now this is all for you since you're short on time
the IDEAL place you wanna be is at understanding stuff like inductive/withdrawing effect and the other stuff you should have already studied.

[Anonymous No.10190273]

lol i haven't even taken orgo and this sheit is easy brah

[Anonymous No.10190275]

>>10190269
knowing the reactants/catalysts is hard tho, do you use mnemonics?

[Anonymous No.10190278]

>>10190275
bitch no
memorize them or you won't do well of course it's hard
pay attention in lecture and amount logic to chemistry and maybe it'll be easier

[Anonymous No.10190280]

>>10190234
>>10190234
Good boy! You have to think about the conformations in 3D and how this affects sterics of back side attack. The cyclopropenyl ring is rigid and the adjacent hydrogens get in the way of backside attack. The cyclopentyl ring is more flexible and has an 'envelope' conformation (look it up) with a carbon pointing out of plane - stick the Br on that carbon and you'll notice that there's much less of a steric barrier to backside attack for SN2. Cyclobutenyl ring is somewhere in between. You might have to draw the transition states with clear 3D conformations in the first part of the question for full marks.

[Anonymous No.10190301]

>>10190280
thanks anon, but I don't have much experience with transition states. I can't find the procedure in my textbook or notes either... Can you show me how to do it for these problems here? I'm really trying to learn this properly, but I can't seem to figure it out by myself.

[Anonymous No.10190305]

>>10190301
not the same anon but
sn2 is a concerted reaction with 2 arrows (unless proton transfer, i.e an alcohol is involved) One arrow is cleavage from the leaving group the other is a nucleophilic attack

[Anonymous No.10190310]

>>10190301
bromine is your leaving group in all cases
CN- is your Nu(-) a carbocation intermediate forms only for Sn1/E1 mechanisms for the chapters you're in ( Substitution / elimination)

[Anonymous No.10190316]

>>10190310
>>10190305
Could you provide a visual representation? I would really appreciate it

[Anonymous No.10190319]

>>10190267
Two of those literally say do not memorize

[Anonymous No.10190321]

>>10190316
anon.... come on...
i typed it out : (
one arrow is cleavage (leaving group leaving)
second arrow is from the CN- to the place the Br left >:(
you could always google sn2 intermediate >>>>::((((

[Anonymous No.10190326]

>>10189911
Unrealistic hair physics.
0/10

[Anonymous No.10190334]

>>10190321
point-taken, thanks for the help this far. I'll try it out and see how far I get

[Anonymous No.10190339]

>>10190334
you got this brah
don't be intimidated
ochem is a sheep in wolf's clothing, not the other way around
YOU GOT THIS!!
GANBATTE!!!!!

[Anonymous No.10190385]

>>10190316
Look at how much more accessible the five membered ring is to backside attack in contrast to the three membered ring.

[Anonymous No.10190399]

>>10190385
thanks orgo hitler

[Anonymous No.10190430]

>>10190385
thanks orgo hitler

how are these transition states?

[Anonymous No.10190449]

>>10190268
Is it going to be impossible to get an A during a month long summer semester? I plan on putting in at least 5 hours a day. Has anyone taken summer ochem?

[Anonymous No.10190458]

>>10190430
>>10190430
2/4 you forgot the overall negative charges and didn't show the 3 dimensional conformation of the rings, which is crucial for understanding why the cyclopentane reaction is much faster. You have the right idea though and it's more important right now to focus on learning the mechanisms and reactions. Remember this is just the transition state for SN2 reactions - do you know the mechanism and intermediate for SN1 reactions?

[Anonymous No.10190467]

>>10190458
Okay...I don't think I have to draw conformations here because thats not how the starting material was drawn what they gave me

I also adjusted angles for bonds, and where do I put negative charge in top right corner of box? All of them are negative correct?

[Anonymous No.10190468]

>>10190458
Here's another SN2 mechanism and transition state example. It's easier to draw if you don't have to worry about rings.

[Anonymous No.10190474]

>>10190467
I realized using delta negatives is better, is this correct? And same delta negatives for all of them correct?

[Anonymous No.10190480]

>>10190467
Yeah that's better. I usually draw the charge here at the top of the box or slightly to the side of the Br-C-CN axis because it's not really localised on a single atom during this TS. You could also include K+ counter ion to be fancy but it's not necessary.

[Anonymous No.10190485]

>>10190480
Where would K+ go?

[Anonymous No.10190487]

>>10190474
I wouldn't use deltas for that personally, I'd stick with just using overall charge. (I realise the last pic I linked has them though).

[Anonymous No.10190490]

>>10190487
How come?

Also can you check my answers on this?

[Anonymous No.10190496]

>>10190490

[Anonymous No.10190499]

>>10190485
Anywhere really if you want to include it, just hanging around at the side balancing out the charge. It would be incorrect if you had the negative charge outside the bracket AND the K+ inside the bracket or vice versa though. This is getting into details that aren't really important for the task you have at hand though.

[Anonymous No.10190501]

>>10190490
>>10190496

[Anonymous No.10190552]

>>10190490
Cba
>>10190496
>>10190501
That all looks pretty good, but I haven't thought about electrophilic aromatic substitution for more than five years so you should double check.

[Anonymous No.10191410]

>>10190552
Is OP gonna fail?

[Anonymous No.10191771]

Four whole reaction mechanisms? Oh my god. You're done.

Just memorise it, you idiot. 6 reactions and 4 mechanisms, that's literally nothing. Just spend one hour memorising it then go over it again a couple of hours later then again before going to bed.

[Anonymous No.10191782]

>>10190015
this
can't recommend not doing anything like this.
good job anon, proud of you

[Anonymous No.10192984]

>>10189260
OP are you still alive? Hope you worked hard today. Happy to help with any questions.

[Anonymous No.10193015]

>>10189289
日本語を習うのはめっちゃ優しいんじゃ?

>>10189260
depends what you need to know about em. I'd focus on past exams and figure out what part of the mechanisms your prof focuses on.

If its just the mechanism itself I'd focus on what substrates are the focus, what products it makes, and under what conditions. good luck man

[Anonymous No.10193704]

>>10189260
>>10190102
This shit is giving me severe aneurysm just by looking at it.

[Anonymous No.10193790]

Chemistry is the hardest part of science. It's like biology but BORING. So it's actually harder to memorize