The Periodic Table

9-BBN

12:10 AM

@Jan you said much more than one step what do you think of that

Bounty Hunter

1:19 AM

3

Q: Structure of Sodium Naphthalenide

This question is a sort of follow-up to my earlier question. I know about a method of solubilising potassium where the potassium atoms are "trapped" between layers of graphite, but I think that sodium naphthalenide exists only in solution (if a contradiction is found, please inform). In the sol...

user228700

4:07 AM

Hey everyone :-)

user228700

I've a quick question. Whilst drawing resonance structures, why is that structures that have smaller separation of opposite charges are more stable than those structures in which opposite charges are delocalized on atoms that are farther away from each other?

user228700

My textbook explains this by saying that it requires energy to separate opposite charges...but why?

user228700

Googling has not yielded any answers :-|

user228700

Also, erm, my textbook has given a few guidelines to select the most stable structure of all the resonance structures and these are:

user228700

4:17 AM

But how am I to prioritize among these rules?

orthocresol

9:21 AM

@9-BBN huh? That's not a Weinreb amide...

DHMO

@Kaumudi coulomb's law

THE LONE WOLF.

Hey guys,Is anyone of U active on academia??I have got a problem there.

orthocresol

5

A: Structures for NO+ (Nitrosonium)

Which is a better Lewis structure? There is no such thing as a better or a worse Lewis structure. They should be properly referred to as major or minor resonance contributors/forms. I looked up a textbook to check the rules of determining which resonance structure contributes more. The orde...

DHMO

@Kaumudi why would you need to?

user228700

@DHMO To rank canonical structures based on their stabilities.

ringo

9:30 AM

0

A: Problem digesting sample for Ti analysis using ICP-OES

So, posting here since I can't comment due to lack of rep. When you say "trouble digesting" what is you trouble? You say the analyses come out other than expected, but do you mean "the solution is cloudy". Is this a fact? If the solution is clear it can still be a digestion problem for certain bu...

DHMO

@Kaumudi there are actual questions that ask u to do so?

user228700

@DHMO Yeah.

THE LONE WOLF.

guys please answer

ringo

People never cease to amaze me

"I don't have enough rep to post a comment, so that must justify me posting my comment as an answer"

user228700

@DHMO Ah, OK.

user228700

9:33 AM

@DHMO: No clue?

user228700

Ooh BTW, is anybody here familiar w/ Moseley's Law?

THE LONE WOLF.

@ kaumudi,are u reading soloman and fryhle??

9-BBN

20 mins ago, by orthocresol

@9-BBN huh? That's not a Weinreb amide...

@orthocresol yes you're right i forgot the OMe on the N in Weinreb amide

But it looks like ^^

user228700

9:53 AM

@THELONEWOLF. Yes.

1,3-feeds

11:18 AM

0

Q: What's our (maybe updated) take on questions about (quantum) chemical software?

From What topics can I ask about here? Some kinds of questions aren't allowed here: Computational questions: If your question is purely about numerical methods you are using in a simulation/etc, it is probably more appropriate at Computational Science. Recently (or maybe not) I n...

discussion scope software

DHMO

11:45 AM

@ringo maybe they just want to speak

Aaron Abraham

1:56 PM

@Jan Ha! I already have a bunker ;) de.wikipedia.org/wiki/F%C3%BChrerbunker

Heyyy! Trump isn't that bad ._.

@Kaumudi That might depend on how you define 'familiarity' o.o

@Kaumudi Curiosity question: Are you a Pinarayi mol or a Chandy mol?

Politics is the inevitable destination of every conversation

user228700

2:20 PM

@AaronAbraham I...don't know anything about politics in Kerala, sorry.

Aaron Abraham

2:45 PM

@Kaumudi Of course you wouldn't know. After all, you aren't a Keralite, right ;)

Fine then @Kaumudi , who were ye mooting for? Trump or Clinton? [I was the only one in my class mooting for Trump as President, but every other guy in the class wanted Pullimurughan for President X'D]

Oh right! You aren't a Malayali. Just so that you know, Pullimurughan is the Malayali equivalent of Kabali ;D

"Not a Malayali", God I love rubbing that in 3:)

user228700

3:13 PM

@AaronAbraham No, I am not. I don't even like Kerala all that much. I'm a Malayali but I identify as a Chennaitee because I've lived here my whole life.

user228700

@AaronAbraham Hilary-the lesser of two evils.

Aaron Abraham

@Kaumudi ಠ_ಠ

She's the only one that's evil there ;P

@Kaumudi :O

Treason

ಠ_ಠ

Lived there your whole life? Darn, your life must've sucked XD (no offense)

@DHMO o/

DHMO

@AaronAbraham Guten Tag

Aaron Abraham

Well at least ya didn't Guten Tag me this time, so I guess that's an improvement ;)

user228700

@AaronAbraham I'd like to extricate myself now, from what may possibly be a heated argument about why Chennai has been better to me than Kerala.

Aaron Abraham

3:21 PM

@DHMO It's been a while since a ran into ya ._.

DHMO

@AaronAbraham I'm just in the math chat room

Aaron Abraham

@Kaumudi Whoops, typing error! You mean "Kerala better than Chennai", right? XD

user228700

*To me.

Aaron Abraham

._.

@DHMO And to think I thought this was the Chem. chat room. Must be those mushrooms I ate ._.

So @Kaumudi, JEE or some regional exam?

user228700

@AaronAbraham JEE.

user228700

3:23 PM

Gots to go now. Bye!

Aaron Abraham

@THELONEWOLF. Seems to be all over you; guess that explains it ;)

@Kaumudi Tschüss

> Kaumudi,are u reading soloman and fryhle??

@Kaumudi Honestly, what d'you think you're chances of making it to the top 500 are?

Curious

Quantum CAPUCCINO

Does anyone here have experienced with the exabyte platform?

have experience*

Aaron Abraham

._.

DHMO

@AaronAbraham have i asked you where you are from?

Quantum CAPUCCINO

3:40 PM

@Chemobot Do you still talk?

DHMO

!!greet/@QuantumCAPUCCINO

Chemobot

Welcome to The Periodic Table @QuantumCAPUCCINO! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

Quantum CAPUCCINO

That's neat.

!!greet/@DHMO

Chemobot

Welcome to The Periodic Table @DHMO! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

THE LONE WOLF.

@AaronAbraham,I can't get you.what r u trying to say??

Quantum CAPUCCINO

3:48 PM

!!greet

!!greet/

Chemobot

Welcome to The Periodic Table ! Here are our chat guidelines and it's recommended that you read them. If you want to turn Mathjax on, follow the instructions in this answer. Happy chatting!

Quantum CAPUCCINO

!!dance/

THE LONE WOLF.

@Chemobot,was it for me??

user228700

4:50 PM

@AaronAbraham I don't know, man.

THE LONE WOLF.

5:15 PM

Top 500 in what??

Loong

6:32 PM

misclicked? chemistry.stackexchange.com/questions/21873/…

Jan

7:56 PM

@9-BBN It somewhat defeats the point to use a compound as catalyst that you’re trying to synthesise three steps later :D

@Martin-マーチン Hee~y, I’ve almost got a finished introduction, which means a finished text (except for an abstract … that should be done tomorrow™ …)

@Loong Probably … just doesn’t make sense otherwise …

9-BBN

@jan about what are you speaking ?

Oh

Sorry

Yes this is really awkward

:D

I am working on a better idea but 1)organic chemistry is not my cup of tea even if I like it and 2) I'm just a student without a lot of experiments so

Jan

!!tea

Chemobot

9-BBN

For two ?

!!ricin

!!ricine

!!img ricin

Jan

8:16 PM

!!img/ricin

?

Chemobot

No result found.

9-BBN

:O

@Chemobot do you know BreakingBad ?

Loong

@Jan That thing has more than 60 kDa. Do you really want the poor bot to draw that structure? ;-)

9-BBN

The structure is on wiki ^^

Jan

@Loong It’s not like the bot is drawing anything, it totally just steals it from the interwebs ;p

9-BBN

8:19 PM

9-BBN

8:41 PM

@Hippalectryon Yo ca va ?

!!/img EDTA

Hippalectryon

@9-BBN oui et toi ?

9-BBN

Moi ca va plutôt bien, tu es toujours en stage militaire

Ah le bot a du mal avec l'EDTA ...

Hippalectryon

@9-BBN oui

!!img/edta

Chemobot

9-BBN

J'ai tapé à l’envers la commande ^^

Hippalectryon

8:49 PM

:P

9-BBN

Et ça consiste en quoi ?

Jan

@9-BBN Tu dois écrire img/{nom du molécule}. Tu le fais incorrectement tous les temps !

9-BBN

fais*

:P

Hippalectryon

@9-BBN Pour l'instant je suis en école d'officier de la gendarmerie, j'entre en unité pour 4 mois dans deux semaines

Jan

(I know my French is horrible if I don’t spell check five times minimum! ;p)

9-BBN

8:50 PM

@Jan I though first it was Hyppa ^^

Hippalectryon

@Jan Your French looks really natural though !

Jan

\o/

9-BBN

Tu = s at the end :)

@Hippalectryon et ça te plaît ? :P

Jan

@9-BBN In theory I know, yeah … although x = s ;)

9-BBN

Yes :)

Hippalectryon

8:52 PM

@9-BBN Il y a des moments plus intéressants que d'autres... mais ça va dans l'ensemble. En revanche l'absence de wifi me rend triste :-(

9-BBN

Ahahaha le pauvre sans internet il est perdu :P

Jan

(inb4 @M.A.R. unstars that for being foreign xD)

9-BBN

@Hippalectryon does the bot can draw molecules in three dimensions ?

(the)

!!img/buckminsterfullerene

Chemobot

Hippalectryon

@9-BBN chemspider doesn't provide 3D pics of molecules; it does provide a 3D app in which we can interact with the molecules, but the SE chat doesn't support it

9-BBN

8:56 PM

It does ! :D

but in 2D :P

It would be fun if it was possible to keep only one ion in a footballene to have a positive or negative charge alone

Or use them to make 100% yield enantioselective reactions

As big endrance group

Hippalectryon

hindrance*

9-BBN

hindrance

Yeah in en hin an the same with a gum in mouth

Haha people like my answer chemistry.stackexchange.com/questions/62105/…

Jan

I just upvoted ;)

9-BBN

LOL

Only because it is in two step

steps

9-BBN

9:56 PM

@orthocresol what do you think if I use sciencedirect.com.sci-hub.cc/science/article/pii/… urea with two eq acetone then LAH ?

I also though of Wittig with =PPh3 then Eschweiler-Clarke after LAH and to finish O3 with PPh3

orthocresol

10:15 PM

why acetone? You'd be sticking an isopropyl group on the nitrogen that way.

Oh, I see. The alkyl group doesn't matter.

As I said, I don't buy the LAH reduction. I'm not sure, it might work, but I'd need to be convinced a bit more.

Jan

If LAH overshoots, just Swern or DMP the resulting methanol. No?

orthocresol

¯\_(ツ)_/¯

Fair enough..

9-BBN

Well what would you do with LAH ?

Oh

methanol hum

orthocresol

I don't know what ozonolysis does to terminal alkenes.

and I'm a bit lazy to look it up right now

9-BBN

If we take exaclty enough LAH to make the reaction why do methanol

orthocresol

10:19 PM

the moment you make any formaldehyde, LAH is going to attack it instead of the amide (which is much less electrophilic)

Jan

Terminal alkenes are ozonolysed just like internal ones.

But OsO4/NaIO4 could be equally viable.

orthocresol

fair enough - because (usually) people care about the other side of the alkene instead of the CH2 part ;)

IIRC with oxidative workup you get CO2, but again not sure

9-BBN

So if it is possible I have a cycle to propose with urea as catalyst lol

orthocresol

don't see any reason for that with PPh3 or Me2S

Jan

Yeah, you should use PPh3 workup.

9-BBN

10:22 PM

IIRC ?

organic-chemistry.org/namedreactions/…

orthocresol

if i remember correctly

and yes, that is the "other side of the alkene" that i'm talking about, if you notice, it doesn't say R = H only R' = H

9-BBN

But what about the second part of the C=C bond ?

orthocresol

that's what you're supposed to show

not saying that you're wrong, i'm just saying that screenshot doesn't tell you what happens to the CH2 part

9-BBN

Then I can use an other phophorus ylure

And it will be ok sure :)

Eschweiler-Clarke will work with the enamine ?

orthocresol

idk, i'm not very interested in this "synthesis" tbh

but if you wanted to methylate urea, i'd just use NaH and MeI

9-BBN

10:32 PM

OK, I do it for fun also it makes me revising my lesson for the last exam of organic chemistry I'll have for all my life

I want to do it as a master ^^

orthocresol

true true, but getting to formaldehyde is pretty difficult..

lots of selectivity problems

all the best, i've gotta go off now

9-BBN

I like challenge. Also I will make other proposition in the answer and people who wants will continue by themselves

orthocresol

exam season now? so many HW questions...

9-BBN

HW ?

I have a continuus control in my school

I did an exam two weeks ago and I'll have a second one in two.

First one was for 20% of the final mark, the next will be for 35%.

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