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Coefficient of drag of runners and cyclists by Polly Gippernere - Thu, 14 Apr 2016 12:27:35 EST ID:DtZ5lIsF No.77833 Ignore Report Reply Quick Reply
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At what speed (MPH or KPH) does aerodynamic drag become a factor for various items?

I know that for automobiles drag becomes a factor when you're in the 30-40mph ballpark, but what about bicyclists or runners? It's easier to determine the coefficient of drag of, say, an airplane or a car because they're (more or less) static objects, but a cyclist moves their legs and a runner moves their legs and arms.

I'm wondering about this because when I'm on a stationary bike, I'm able to pedal faster with more power when I'm in the typical forward fold versus when I'm pedaling upright-- aerodynamic forces are pretty well negated in this case. The same thing goes for running-- if I'm jogging upright on a treadmill versus leaning forward, I produce more power and speed when I'm leaning forward because my center of gravity has shifted-- but does leaning forward provide any specific aerodynamic benefit for anyone who isn't running as fast as Usain Bolt?
Nell Hagglestat - Sun, 17 Apr 2016 15:28:41 EST ID:6SGTYI6Z No.77850 Ignore Report Quick Reply
Sounds like a difficult question to answer, but if you're running on a treadmill then do aerodynamics even matter? It seems like they wouldn't compared to normal running.

The Manhatton project is why the Pryamids are really real by Hugh Penningforth - Sat, 06 Feb 2016 22:12:47 EST ID:NPo+K9eR No.77626 Ignore Report Reply Quick Reply
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If the whole society of America came together to create the A-Bomb and that was an endeavor of a whole society , what evidence of the same thing could be used to disprove that aliens built the Pyramids?
2 posts omitted. Click Reply to view.
Betsy Dodgepeck - Mon, 08 Feb 2016 21:45:59 EST ID:YhREOUdy No.77638 Ignore Report Quick Reply
>if they had to place blocks in a serial fashion, just one at a time

Well good thing they had enough manpower (thousands upon thousands of slaves) to place a bunch of blocks at a time, then!
press !QUHukXEvkY - Tue, 09 Feb 2016 12:42:23 EST ID:MD/oThse No.77643 Ignore Report Quick Reply
youre not much of a teamplayer, are you?
Sidney Fanworth - Fri, 12 Feb 2016 03:54:29 EST ID:X6HIP3d/ No.77651 Ignore Report Quick Reply
Mathematically you can only place one block of a pyramid at a time
Nigger Mucklepune - Sat, 13 Feb 2016 06:21:15 EST ID:+DZfgoAX No.77655 Ignore Report Quick Reply
There's a load of blocks on each layer so you'd be able to work from several different angles bring blocks in. You wouldn't even need to be placing adjacent blocks if you planned it right/on the higher levels. Of course as you go up and it gets narrower this slows down. But most of the blocks will be on the lower levels. You might be placing several remote blocks and joining them up for example. What am I missing?
Isabella Drundletetch - Mon, 11 Apr 2016 23:32:55 EST ID:VJYm4aCY No.77824 Ignore Report Quick Reply
YOU speak on many levels.

Hydrogenation without a pressured hydrogenator by Clara Chunderwun - Sun, 06 Mar 2016 19:24:22 EST ID:5P3qbCIv No.77713 Ignore Report Reply Quick Reply
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Can this be legit?
Refluxing codeine in an acidic medium with finely grounded Palladium without a hydrogen gas supply to Yield 85-95% of dihydrocodeinone?
Sounds too easy as anyone has an access to a simple refluxing setup, palladium metal, codeine and an acid. Also to my understanding dihydrocodeinone is a fuckload more potent than codeine...
15 posts and 4 images omitted. Click Reply to view.
James Sunkindale - Sun, 13 Mar 2016 18:28:07 EST ID:jIgmEPvp No.77744 Ignore Report Quick Reply
I have to correct myself straight away. I forgot that the volume of the balloon increases as it is filled so there hardly is any pressure in the system (I mean it is almost equal to the pressure outside the system).
But still: hydrogen gas present!
Bombastus !RZEwn1AX62!!xXxJO70U - Sat, 19 Mar 2016 10:05:14 EST ID:4ppVjZXo No.77756 Ignore Report Quick Reply
dihydrocodeinone is also called:

You never need a pressured hydrogenator. For the amateur, you can either use in-situ hydrazine or in-situ ammonia formate.
Actually, the hydrogen is generated in-situ. sue me.
Bombastus !RZEwn1AX62!!xXxJO70U - Sun, 20 Mar 2016 14:48:35 EST ID:vbS8CtHn No.77758 Ignore Report Quick Reply
The only way to separate codeine from hydrocodone is either to react all the codeine to hydrocodone.
Or alternatively, you could run a column on them.
press !QUHukXEvkY - Tue, 22 Mar 2016 15:35:02 EST ID:pAeUlupM No.77765 Ignore Report Quick Reply
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im paaaaaretty sure that crystallization would be sufficient -eventhough they have very similar- solubility as long as theres more product than educt. but then again a short glass tube and some alumina wouldnt cost the world. id have to guess that alumina would be better for the seperation since the codeine is a tad more polar and since sillica tends to fuck with amines. im also guessing it easier to buy and cheaper at a reasonable mesh.

id try and prove my point had i been smart enough to get some Pd/C and if codeine werent sceduled in this shithole.
Ru-lover - Mon, 11 Apr 2016 15:50:28 EST ID:XzFsS2/x No.77823 Ignore Report Quick Reply
Try extraction of the HCodo with bisufite solution. Then crystallise out the HCodo with NaOH.

What have I got here? by Priscilla Duggleson - Sun, 03 Apr 2016 20:58:07 EST ID:SVefPavO No.77797 Ignore Report Reply Quick Reply
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I stumbled upon this bunch of labware from this old dude I've been working for. I'm not sure what all the components are. Aside from basic college chemistry and a couple DMT extractions, I'm pretty much a layman in the chemistry field. But I hope to do something with it, or at least know what its all used for. Any of you science types able to help me identify these?
5 posts and 2 images omitted. Click Reply to view.
Eugene Heblingford - Tue, 05 Apr 2016 02:52:06 EST ID:5P3qbCIv No.77806 Ignore Report Quick Reply
By the way, how much pressure do you think those cheap ebay china round bottom flasks can hold without exploding? I assume that there is a quality difference because of the low price but how much different?
Obviously not asking the specific value but just thinking about vaccuum distillations and maybe (semi)low pressure hydrogenations etc. Do you guys think a joint will pop off before the glass goes boom?
Talking about the stuff you can find from ebay when searching for "chemistry kit" and which is shipped from china or hongkong. Are they just shit? At least they claim its high quality borosilicate glass but...
press !QUHukXEvkY - Tue, 05 Apr 2016 10:55:57 EST ID:YuS+YrwH No.77807 Ignore Report Quick Reply
my old uni scripts from vienna stated the maximum pressure at 1,5 bar.
i have no idea how reliable specific chinese vendors are. there are some that do solid work and then there are a lot of fuckers that just want to let the capitalists bleed. ill try to find a shematic

youll have to use good clamps. and i recommend using a security net or an improvised blast shield, combined with a tub to catch any spills.

depending on much pressure youll want to use, you could also construct a pressure regulator akin to a pneumatic trough, but thats for itty bitty pressures- these fuckers are better for estimating hydrogen uptake anyways if all one can get is a ghetto pressure meter
Archie Finningtot - Wed, 06 Apr 2016 07:38:18 EST ID:SVefPavO No.77811 Ignore Report Quick Reply
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Thanks for the input guys. It looks like i've got a decent setup for clandestine chemistry, its a shame that I probably wont be able to put it to full use. Would some of this be easy/lucrative to sell on CL or something? I have a second separatory funnel and a stand as well that I didn't picture.

I got all this stuff for free, it was just sitting in this guys attic collecting dust and rat shit. If i don't sell it, I'll likely incorporate it into a mixed media art piece, or maybe make molds of some parts and cast copies in ceramic.
press !QUHukXEvkY - Wed, 06 Apr 2016 12:09:50 EST ID:YuS+YrwH No.77812 Ignore Report Quick Reply
isnt lab glassware considered drug paraphenilia or something like that in some parts of the us? i cant recall, maybe im just paranoid

check CL and ebay for an idea of how much you can charge.
i guess you could easily get a hundred bucks, maybe more if you play your cards right and arent in a rush. i have no idea how negiotiating on CL works though
Ian Claydock - Sun, 10 Apr 2016 14:59:36 EST ID:roMD3xgx No.77820 Ignore Report Quick Reply

Chemists are witches out to stir up trouble in the public with their evil craft.

I want to see what the poop sees by Whitey Sungerford - Wed, 24 Feb 2016 15:48:51 EST ID:ANui6f84 No.77694 Ignore Report Reply Quick Reply
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How can I turn shit into enegergy I was thinking like a 3 meter dome, shiphon the shit from the sewer before those basteds that fired me from the sewage plant can get there dirty hands all over it, the pretty much lite the gas on fire and covert a diesel generator to take gas, how would one do that?
Henry Niggerway - Fri, 26 Feb 2016 17:18:42 EST ID:erzI3/TD No.77697 Ignore Report Quick Reply
You're probably joking, but this is actually somewhat feasible. Decomposing shit releases methane which is flammable. If you can capture it you can burn it for energy. However, methane isn't particularly well behaved, so it may not be all that feasible to get a internal combustion engine running well on it. You can probably get one running, but you're going to have leakage and damage to the seals because they were meant for a liquid not a very volitile gas.

I'd recommend burning the methane to produce heat, and boiling water with that heat, then forcing the steam from the boilers to go through a turbine.
press !QUHukXEvkY - Fri, 26 Feb 2016 18:36:42 EST ID:ax6SYN1K No.77698 Ignore Report Quick Reply
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that idea seems very familiar. almost as if its been out into practise for decades.
its a great way to put waste to use

Doris Shittingshaw - Tue, 15 Mar 2016 01:54:34 EST ID:6Uohuwu9 No.77747 Ignore Report Quick Reply
I cleaned my cleaner and now it's gone!
John Gebberwater - Fri, 08 Apr 2016 02:32:24 EST ID:sIdNWEOq No.77817 Ignore Report Quick Reply
That's like one time I splid spot remover on my dog and now he's gone... Lol

substitute by Nigel Tillingstock - Sat, 02 Apr 2016 19:43:27 EST ID:CVyPUaOx No.77791 Ignore Report Reply Quick Reply
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ok guys what could I use instead of palladium (II) chloride for catalisys?

this chemical is FUCKING expensive
1 posts omitted. Click Reply to view.
press !QUHukXEvkY - Mon, 04 Apr 2016 14:25:50 EST ID:YuS+YrwH No.77802 Ignore Report Quick Reply
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what are you trying to reduce?
i mean besides the costs.
Oliver Drinningway - Mon, 04 Apr 2016 17:49:10 EST ID:CVyPUaOx No.77804 Ignore Report Quick Reply
wacker oxidation for safrole (ot sure if black palladium could do the trick)
Bombastus !RZEwn1AX62!!xXxJO70U - Tue, 05 Apr 2016 02:21:59 EST ID:Ym/MkWsP No.77805 Ignore Report Quick Reply
nope. palladium black will not do the trick because it requires an oxidation cycle like the regular inert metal coupling reactions.

looks like you're stuck with palladium chloride or find another method.
Archie Hommlewater - Tue, 05 Apr 2016 20:55:49 EST ID:CVyPUaOx No.77810 Ignore Report Quick Reply
thanks for the response...will do
Ru-lover - Thu, 07 Apr 2016 13:52:58 EST ID:XzFsS2/x No.77813 Ignore Report Quick Reply
try to look on alibaba or other B2B, PdCl2 is 5-10x less expensive there than Sigma or other companies. PdCl2 is a well known product and purity is always good even it comes from china.

Reactions with Tosylates by Walter Miffingchure - Fri, 25 Mar 2016 04:51:42 EST ID:YfH8FcVI No.77768 Ignore Report Reply Quick Reply
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Out of curiosity, would it be possible to react a primary amine with a sulfonyl group (tosylate specifically) and then subsequently use a base followed by a nucleophilic substitution with, say, iodomethane to produce a secondary amine?
Walter Miffingchure - Fri, 25 Mar 2016 12:09:26 EST ID:YfH8FcVI No.77769 Ignore Report Quick Reply
OP here, never mind I solved the not-synthesis problem with the help of the internet and way too much goddamn adderall
Ru-lover - Wed, 30 Mar 2016 19:15:51 EST ID:1yz9Gpwk No.77778 Ignore Report Quick Reply
Yes you can. The sulfonyl group makes the H more acidic and thus easier to deprotonate. It also locks the nitrogen lone pair avoiding overalkylation.
yes - Tue, 05 Apr 2016 18:19:46 EST ID:AhXs56nn No.77808 Ignore Report Quick Reply
good anon - Tue, 05 Apr 2016 18:20:58 EST ID:AhXs56nn No.77809 Ignore Report Quick Reply

Help an unmotivated loser out by Polly Winnertid - Fri, 01 Apr 2016 15:00:53 EST ID:hqftNCGp No.77783 Ignore Report Reply Quick Reply
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I realise that this board is mostly used for instructions on how to make drugs in your fucking garage, but since this is also a science board I thought that I would ask you brilliant minds for help.
I have a upcoming project, spanning a year or so, that will entail/connect almost every course I am taking. I am supposed to pick something to create, experiment, etc. and present the result to my professor(s) and peers.
I have seen dudes investigate pharmacuticals, tried to treat salmonella by destroying its flagella with enzymes, etc.
What the hell am I supposed to do?
I might be given access to chemicals, but I do not want to make drugs, even though that would be sweet.
Alice Bicklechot - Fri, 01 Apr 2016 15:32:24 EST ID:NPdGYjgm No.77786 Ignore Report Quick Reply
Is there anything else than sweet sweet drugs that you are even slightly interested in? Preferably something to do with making the world a better place. Great grades coming easily if you do some shit to help african children or make an anti hangover pill.
Start with something not so specific that interests you, do some investigation and then get closer and closer to your ideea until you are drinking champange from a nobel prize while popping anti hangover pills that help african children.

Naltrexone -> Oxymorphone? by Hamilton Beggleshit - Thu, 17 Mar 2016 18:16:02 EST ID:GksK9UMc No.77752 Ignore Report Reply Quick Reply
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Dear /chem/,

wikipedia cites that "Naltrexone can be described as a substituted oxymorphone – here the tertiary amine methyl-substituent is replaced with methylcyclopropane. Naltrexone is the N-cyclopropylmethyl derivative of oxymorphone."

Is it possible to revert naltrexone back to oxymorphone? If so, how?

My very limited understanding of organic chemistry leads me to believe that naltrexone could, in proper solution and (probably) with the addition of heat, be broken into oxymorphone and cyclopropylmethylbromide. (pic related)

Any input regarding said (hypothetical) reaction will be greatly appreciated!
2 posts omitted. Click Reply to view.
Bombastus !RZEwn1AX62!!xXxJO70U - Sun, 27 Mar 2016 13:18:03 EST ID:4ppVjZXo No.77773 Ignore Report Quick Reply
Didn't you start your comment by saying that "you cannot remove the cyclopropylmethyl group of the amine" and then go on and say how to remove that group? Correct me if I misunderstand, please.

If I understand correctly, I don't see why it would. The less sterically-hindered ethylene-amino bridge be cleaved vs the cyclo-propyl (more hindered) group?

However, I guess using a sterically selective agent like dodecanethiol would help. You're right that the alkyl group would fall apart but which one? Isee the ethylene bridge snapping apart before the methylcyclopropyl group is even touched with an equilibrium of 1:1000 or greater
Vehk !7HYGxe5v5c - Mon, 28 Mar 2016 10:59:30 EST ID:mqpMZrCV No.77774 Ignore Report Quick Reply
1459177170548.jpg -(38976B / 38.06KB, 463x411) Thumbnail displayed, click image for full size.

OP was talking about naltrexone, which contains the methylcyclopropane substituent, the guy above you is talking about naloxone, which shares the same structure as naltrexone except with an allyl group instead of a methylcyclopropane group forming the substituent.

See picture for reference.
Fanny Munkinspear - Wed, 30 Mar 2016 11:18:57 EST ID:8U0GcjC9 No.77775 Ignore Report Quick Reply
>in real world amine chemistry:
I read this is "in real anime world chemistry"
Ru-lover - Wed, 30 Mar 2016 19:13:14 EST ID:1yz9Gpwk No.77777 Ignore Report Quick Reply
Thanks for clearing this up. Its exactly what I am talking about. Allyl group is 1000x easier to remove than cyclopropylmethyl. You can also use wilkinson catalyst, there are some papers about that.
Cornelius Bushwen - Sun, 10 Apr 2016 22:52:26 EST ID:ljoFE2/4 No.77821 Ignore Report Quick Reply
Quints don't happen here but once in a great while.

A. muscaria - complete decarboxylation of ibotenic acid to muscimol by Faggy Sorringdedge - Thu, 17 Mar 2016 12:28:40 EST ID:ge3zUrSE No.77751 Ignore Report Reply Quick Reply
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I have a chemistry related question for you.

I've read in two separate sources that it is possible to decompose all the ibotenic acid in the muscarias to muscimol by boiling it in a very low pH solution (2.7). One source seems to have used HCl to achieve this. I was wondering if this would be possible to achieve using household vinegar or citric acid.

5% household vinegar seems to have a pH of 2.4, but acetic acid has a low vapour pressure, so boiling vinegar would vapourize acetic acid with water. apart from making your house smell, vapourising acetic acid would drive the pH of the solution higher, so you might need to add more vinegar to the pot regularly.

However, attempting the same with citric acid seems to be more straightforward since citric acid doesn't vapourise as readily. You can just add water to the boiling solution to cover for evaporation losses and be fine. Lemon juice is said to have a pH around 2, and you can calculate the pH of a solution from the amount of citric acid you add so it should work.

After 2.30 - 3 hours of boiling, you can just add some sodium carbonate to neutralize the pH in order to make it more palatable, and filter to remove leftover carbonate/mushroom pieces, and drink. I'm pretty certain this step wouldn't alter the structure of muscimol.

The conversion from ibotenic acid to muscimol seems to be dependent on pH, so I think it should be possible, but I don't have enough chemistry knowledge to say or certain. What do you think?

If this works, this could be used as a very easy homemade tek for preparing Amanitas.

Pic related, ibotenic acid converts to muscimol after boiling at low pH.
Comment too long. Click here to view the full text.

Learning chemistry online by Alice Mevingpug - Sat, 12 Mar 2016 03:40:46 EST ID:KCS86o4a No.77741 Ignore Report Reply Quick Reply
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Hey guys,

I want to get into chemistry. Can you recommend some good, free online courses or something? Or maybe some book(s) that is good for a self-learner? The site study.com offers a free 5 day trial (afterwards the cheapest thing is $50/month which isn't bad), I will give that one a go. On this other site, alison.com are some free courses of introduction to chemistry, which is exactly what I'm looking for, but it looks like these are only videos, I'd rather have something like videos and presentations/written text so I can re-read it and learn it.. you know, just like in college. Yeah I could make my own notices while watching the videos but fuck that noise, I hate making notices. Any suggestions?
Hannah Tootgold - Sat, 12 Mar 2016 17:37:00 EST ID:xxs07y/f No.77742 Ignore Report Quick Reply
Kahn Academy

General and organic chem text books. do the practice problems
Fuck Chondlegold - Mon, 14 Mar 2016 03:11:44 EST ID:hqftNCGp No.77745 Ignore Report Quick Reply
khan academy will have all the chem high school courses
only thing is you wont be able to make cool experiments and shit
schools got access to some sweet fucking chems, dude
Samuel Pibberbutch - Mon, 14 Mar 2016 13:16:59 EST ID:ybs70zkB No.77746 Ignore Report Quick Reply
thanks man, I'll check it out

yeah I know, but I already finished one college and I just started at a new job, I don't have the time right now to start another college. Besides, I don't remember shit from the high school chemistry, so this is a great start for me.

Anthropology by Eugene Meblingkut - Thu, 10 Mar 2016 23:29:56 EST ID:HSdvhBMF No.77739 Ignore Report Reply Quick Reply
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Please mystify me.

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