Aliphatic Compound Puns

An Ir‐catalyzed C(sp3)−H alkynylation of aliphatic ketones, aldehydes, and alcohols was achieved by using the corresponding oxime derivatives and a IrIII catalyst. This general reaction is selective towards primary C(sp3)−H bonds and can be used for the late‐stage C−H alkynylation of complex molecules.

Abstract

An Ir‐catalyzed C(sp3)−H alkynylation of aliphatic ketones, aldehydes, and alcohols was achieved by using the corresponding oxime derivatives and a IrIII catalyst. This general reaction is selective towards primary C(sp3)−H bonds and can be used for the late‐stage C−H alkynylation of complex molecules.

https://ift.tt/2U98Kam

When observing all the different types of organic molecules that exist, many seem to contain ring structures and are almost iconic in chemistry. Particularly in biological systems, many drugs (both naturally derived and synthetic) and biological molecules (sugars ect) seem to contain some sort of cyclic ring(s).

Why are rings so common? Is it because these type of structures are inherently stable? I know aromaticity leads to an increase in stability, but what about aliphatic compounds?

Note: I am a physical chemistry PhD student, but this has recently come to mind. Cheers!

So the Dragendorff stain has been amazing for detecting aliphatic secondary and tertiary amines, but one compound I make has 3 secondary amines and one tertiary amines and I can't get it to stain. Every other related compound I've made stains beautifully and fast. Has anyone seen that some amines just won't stain with Dragendorff? Any other potential stains for a molecule that only has secondary amines and one tertiary amine and an amide on it?

Edit for reference this is the version of the stain I made to use https://www.silicycle.com/faq/thin-layer-chromatography/stains-for-tlc-plates I've also remade the stain before with no change

I’m building my maverick at the dealer tomorrow and I’m wondering if I should add a bedliner. Do most of the videos showing a maverick have one included?

Did you include one in your build?

>I'm keeping the original post in tact, but be sure to check the edits! Some changes are being made...
>
>Also! Thank you so much for the silver et al, and for all the great advise! A lot of people are explaining that we had plastics in antiquity if you consider anything malleable ("plastic") or anything with polymers to be plastic. Thanks for the learning opportunity! But to be clear, I intended to mean oil-based plastic, like (in this case) polyethylene: what our plastic bags and containers and all are made of.
>
>Thank you all for your help thus far. This has been thrilling for me through and through, and a great learning experience for someone who only ever took a chemistry class in high school (and got, like, a high C, I think).

So, any critique from somebody more knowledgeable about chemistry and plastics would be appreciated.

First off though, a little background about my planet, Nulaxia (name pending):

• It's a cold planet orbiting an L-class "star"; its temperatures are about -100 °C on average.
• It has 3-4x the atmospheric pressure of Earth's.
• Like Titan, it is a hydrocarbon world. In Nulaxia's case, its oceans contain ethane and other organics (in liquid form) instead of water, and its atmosphere contains methane (in gas form) instead of oxygen. (EDIT: To be clear, the atmosphere is still mostly nitrogen!)
• Fire can still burn on this planet, using the methane in the air as fuel, and the "burning material" as oxidizer. For example, you can burn saltpeter similar to how you could burn wood on Earth. (No, striking a match won't burn up the entire planet; you need an oxidizing agent!) So, heating / cooking / smelting is possible.

So yeah, it may seem obvious that they can make plenty of plastic on a planet with oil for oceans, right? But...before the bronze age?

Hear me out.

• A decent percentage of the ocean's composition is C2H4.
• C2H4 can be separated from the other hydrocarbons in the oceanic mix through evaporation.
• Contaminants can be burned off through melting.
• At 160 °C, C2H4 ("ethylene") polymerizes.

And what does that form? Only one of the most common plastics on Earth.

For context, copper may be forged at 900 °C, and bronze is smelted at a similar 913 °C. Silicate sand melts into glass at 1700 °C. Plastic would be easier to make than metal!

If all they have to do is separate a liquid from their "water" the way we might separate wate

I don't want to step on anybody's toes here, but the amount of non-dad jokes here in this subreddit really annoys me. First of all, dad jokes CAN be NSFW, it clearly says so in the sub rules. Secondly, it doesn't automatically make it a dad joke if it's from a conversation between you and your child. Most importantly, the jokes that your CHILDREN tell YOU are not dad jokes. The point of a dad joke is that it's so cheesy only a dad who's trying to be funny would make such a joke. That's it. They are stupid plays on words, lame puns and so on. There has to be a clever pun or wordplay for it to be considered a dad joke.

Again, to all the fellow dads, I apologise if I'm sounding too harsh. But I just needed to get it off my chest.

Do your worst!

I'm surprised it hasn't decade.

For context I'm a Refuse Driver (Garbage man) & today I was on food waste. After I'd tipped I was checking the wagon for any defects when I spotted a lone pea balanced on the lifts.

I said "hey look, an escaPEA"

No one near me but it didn't half make me laugh for a good hour or so!

Edit: I can't believe how much this has blown up. Thank you everyone I've had a blast reading through the replies 😂

It really does, I swear!

They’re on standbi

Because she wanted to see the task manager.

For last minute revision. Add more in the comments if you want to contribute

CHEMISTRY

• KMnO₄ in acidic medium is a stronger oxidizing agent than KMnO₄ in a basic medium

• Aqueous KOH favours Substitution, Alcoholic KOH favours Elimination

• Higher temperatures favour Elimination

• Hydroboration-Oxidation: Anti-Markovnikov addition of water

• OxyMercuration-DeMercuration: Markovnikov addition of water (NO Carbocation rearrangements in both)

• Acid catalysed hydration(H+/H₂0): carbocation rearrangements CAN occur, pay attention

• LiAlH₄: Very strong reducing agent

• NaBH₄: Slightly weaker, but still a good reducing agent

• DIBAL-H: Weaker reducing agent than LiAlH₄

• Reduction of carbonyl compounds gives alcohols

• Reduction of Ketones gives secondary alcohol

• Reduction of Aldehydes gives primary alcohol

• Reduction of nitrogen derivatives gives amines

• Decarboxylation of simple carboxylic acids requires very high temperatures and the compounds may decompose, but the beta-keto carboxylic acids give CO₂ even on mild heating

• Ozonolysis can be used to convert alkenes to aldehydes and ketones

• K₂Cr₂O₇ cannot oxidize ketones

• hot alkaline KMnO₄ converts primary alcohols straight to acids

• hot alkaline KMnO₄ converts alkenes to ketones or acids

• cold alkaline KMnO₄ converts alkenes to vicinal glycols (syn addition)

• CrO₃ in dil.H₂SO₄ (H₂CrO₄) : Jones' reagent (Weak Oxidizing agent)

• cold, dilute, alkaline KMnO₄: Baeyer's reagent (Strong Oxidizing agent)

• Zn+conc.HCl (ZnCl₂): Lucas' reagent (used in Lucas' test)

• H₂/Pd/BaSO₄: Lindlar's catalyst (reduces alkynes to cis-alkenes)

• Na/Li + liq. NH₃ : reduces alkynes to trans-alkenes

• Pyridinium Chlorochromate (PCC): converts primary alcohol to aldehyde

• Collin's reagent (Pyridine with CrO₃ in dichloromethane): primary alcohol to aldehyde

• THF (Tetrahydrofuran): often used with BH₃

• m-CPBA (metaChloroBenzoic Acid): used in epoxidation

• Hinsberg reagent: Benzene Sulfonyl Chloride (Ph-SO₂Cl)

• Tollen's test: +ve for aliphatic/aromatic aldehydes, alpha-hydroxy ketones, aldehydes and amines, formic acid

• ! Tollen's test =/= Silver mirror test ! eg.Acetylene only gives Tollen's test but not Silver mirror

• Fehling's test: +ve for reducing sugars (red-brown ppt), aliphatic aldehydes, alpha-hydroxy ketones, aldehydes and amines

• Lucas' test: to distinguish prim/sec/tert alcohols

• Carbylamine test: test for primary amines

• Hinsberg test: distinguish between prim/sec/tert

Pilot on me!!

Nothing, he was gladiator.

Dad jokes are supposed to be jokes you can tell a kid and they will understand it and find it funny.

This sub is mostly just NSFW puns now.

If it needs a NSFW tag it's not a dad joke. There should just be a NSFW puns subreddit for that.

Edit* I'm not replying any longer and turning off notifications but to all those that say "no one cares", there sure are a lot of you arguing about it. Maybe I'm wrong but you people don't need to be rude about it. If you really don't care, don't comment.

When I got home, they were still there.

What did 0 say to 8 ?

" Nice Belt "

So What did 3 say to 8 ?

" Hey, you two stop making out "

I won't be doing that today!

[Removed]

Where ever you left it 🤷‍♀️🤭

This morning, my 4 year old daughter.

Daughter: I'm hungry

Me: nerves building, smile widening

Me: Hi hungry, I'm dad.

She had no idea what was going on but I finally did it.

Thank you all for listening.

There hasn't been a post all year!

You take away their little brooms

It was about a weak back.

Why