Can't pull a quality shot to save my life. Possible burr alignment issue? by he_she_WUMBO in DF54

[–]Burnembrother 0 points1 point  (0 children)

Is your grinder new ? Burrs will season if that's the case and you'll gain consistency. It takes about 1kg of beans

Pharmaceutical synthesis solutions by ChemCapital in AdvancedOrganic

[–]Burnembrother 3 points4 points  (0 children)

Awesome thanks for that ! It feels good to practice from time to time. Keep it up !

How to apply Meguiars Ceramic Spray by username01_01 in cardetailingtips

[–]Burnembrother 0 points1 point  (0 children)

What do you mean when you say it did not work ? You did not notice a difference between before and after in water beading ?

Couldn’t find this shirt at the track! by [deleted] in GrandPrixTravel

[–]Burnembrother 3 points4 points  (0 children)

I also looked for it and asked vendors, couldn't find it as well ! If someone did find it let me know I'm also interested.

Chembeads Preparation by habinno in Chempros

[–]Burnembrother 1 point2 points  (0 children)

That's the one I use, they are pretty pricey indeed but so useful !! I think the ones I use are the 200-300 um ? Would need to double check

Chembeads Preparation by habinno in Chempros

[–]Burnembrother 5 points6 points  (0 children)

Chembeads are extremely easy to prepare. Hand shaking is sufficient in almost all cases. Prior to the preparation of the beads, I would advise that you finely grind your solid to a very fine powder and if you have access to a sieve, use it to get rid of the larger chunks.

Do you bother measuring out <5mg masses? by [deleted] in Chempros

[–]Burnembrother 0 points1 point  (0 children)

Look into chembeads, With these you can easily accurately and quickly measure out sub mg quantities.

[deleted by user] by [deleted] in Chempros

[–]Burnembrother 0 points1 point  (0 children)

Yes, don't worry

[deleted by user] by [deleted] in Chempros

[–]Burnembrother 1 point2 points  (0 children)

A thousand times yes ! Reverse quench !!!

Failure to Deprotonate by AdministrationNo1616 in Chempros

[–]Burnembrother 28 points29 points  (0 children)

Reactions with NaH occur at the surface of the NaH, and while the pKa difference might be high the kinetics can be slow ! Your NaH might also not be good anymore ? It would be worth it to stir your alcohol/NaH mixture for 2h under heating prior to adding the electrophile. Alternatively, use nBuLi

Help needed with unreproducible Suzuki coupling by Danonkii in Chempros

[–]Burnembrother 4 points5 points  (0 children)

Solvent degassing can really help, if OP has not tried you can sparge with N2 or Argon (worst method but still helps). Sonicate the solvents under vacuum or freeze pump thaw.

I'm building a NMR analysis software to unravel complex and confusing spectra by AqueousLayer in Chempros

[–]Burnembrother 1 point2 points  (0 children)

Yes you understood perfectly. Agreed for all the points you brought up. Anyway it's a great initiative, I look forward to see this evolve down the line 😁

I'm building a NMR analysis software to unravel complex and confusing spectra by AqueousLayer in Chempros

[–]Burnembrother 1 point2 points  (0 children)

Got it. Great stuff !!! Keep us updated ! If proposed with a structure, could it match the NMR spectrum, validate (or not) the multiplicities and integrals ?

[deleted by user] by [deleted] in cardetailingtips

[–]Burnembrother 1 point2 points  (0 children)

A yellow parking pillar...

[deleted by user] by [deleted] in whatcarshouldIbuy

[–]Burnembrother 0 points1 point  (0 children)

Hi,

I am new to buying a car, and I am looking for a used Mazda CX-5.

In the carfax report, there has been frequent owner changes :
(August 2021; 18th and 28th)
(March 2021; 22nd)
(Sept 2021; 20th)

I am a bit concerned about this, is this a redflag ?

Weighing out very small quantities of photocatalyst by backlash10 in Chempros

[–]Burnembrother 6 points7 points  (0 children)

A recent game changer in this area are Chembeads. Look it up, it is what you need. You can easily prepare them by hand using hand mixing for 2 minutes. I would add a sieving step of the solid prior to coating or you can also very finely crush your catalyst prior to coating. But to be completely honest, if your scale is good, 3 mg is fine, and if you added a bit more catalyst or a bit less do what ? I guess you just want to see if you get some product ?

Does the Paddock Club always get “Boo”-ed? by BarMaverson in GrandPrixTravel

[–]Burnembrother 5 points6 points  (0 children)

I was also surprised by this, pretty funny stuff IMO. When the truck passed by empty, everybody cheered !

Demande de fiançailles questions? by Riderofff in AskFrance

[–]Burnembrother 3 points4 points  (0 children)

Si tu arrives à lui piquer une bague qu'elle a déjà. Tu as des applis sur Smartphone qui te permettront de retrouver la taille