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Suggestions for glass joint-grease that won't get stuck after vacuum distillations?
DMSO is not a good solvent for silicone grease im my experience, but hexane, DCM, and even WD40 shou ...
8-8-2020 at 05:50
by: Dr.Bob
Science equipment looking for a home
If you are in Canada, it is not so bad, everywhere else should likely wait a while. China is the on ...
8-8-2020 at 05:45
by: Dr.Bob
Run Vacuum Pump with Relay Timer (On 2 Sec Off 60 Sec)?
For a real distillation the pressure needs to be constant, and trying to turn the motor on and off w ...
7-8-2020 at 12:01
by: Dr.Bob
Science equipment looking for a home
Yes, it has gotten worse, sadly, due to the small number of planes flying between countries. I hav ...
7-8-2020 at 11:57
by: Dr.Bob
jacketless condenser
Can you just use a vigreux column or a simple 24/40 extension tube, or do you want an insulated sect ...
7-8-2020 at 11:54
by: Dr.Bob
How to start organic chemistry?
I would look around for some older sophmore organic lab manuals, like Fiesers, Vogel, etc, maybe the ...
6-8-2020 at 17:36
by: Dr.Bob
Why doesn't anyone use glove boxes for things like fluorine?
Most fluorine chemistry I have seen in done in metal manifolds (monel or Nickel alloys). It can be ...
5-8-2020 at 17:51
by: Dr.Bob
Would you feel comfortable using aniline and n,n-dimethylaniline (possible carcinogens) in a home lab?
While many anilines are toxic, only a few are highly toxic, so as long as you are careful, you shoul ...
5-8-2020 at 17:23
by: Dr.Bob
Explaining your chemistry hobby
I'm technically not a hobbyiest, but I have been playing with chemicals since 14 or before, and stil ...
5-8-2020 at 17:14
by: Dr.Bob
Heavy wall glass
Thick glass will withstand washing and handling better, terrible with direct flame or other harsh he ...
5-8-2020 at 16:41
by: Dr.Bob
ethyl formate - esterification by reactive distillation
This is a great writeup. Not sure if it works for alcohols to make esters, but for formamides, you ...
5-8-2020 at 16:02
by: Dr.Bob
Suggestions for glass joint-grease that won't get stuck after vacuum distillations?
I agree that Dow Silicone grease is fine, gives peaks around 0.0 in the NMR, but easy to remove with ...
3-8-2020 at 15:50
by: Dr.Bob
(safer) fluorination of benzaldehyde?
[rquote=642054&tid=155910&author=symboom]Electrochemical fluorination - Where Flourine is ma ...
3-8-2020 at 15:45
by: Dr.Bob
Is there any trick to get stir bars to stay centered and spin on flat bottom flasks?
I hope that I am not being too commercial, but if anyone wants to try any of these, I still have a f ...
31-7-2020 at 17:19
by: Dr.Bob
SmCo stir bars worth it?
I don't think I have ever tried one in all my years in the lab, but I would be curious to know if th ...
29-7-2020 at 16:55
by: Dr.Bob
Is there any trick to get stir bars to stay centered and spin on flat bottom flasks?
The oval stirbars are designed to work in round bottom flasks, not flat ones, They will never work w ...
29-7-2020 at 10:59
by: Dr.Bob
Recommendations for synthesis of medicines and other medical organic molecules.
I second benzocaine or lidocaine, it is a great experiment, and easy to tell if it worked. I taugh ...
29-7-2020 at 06:54
by: Dr.Bob
plastic coated glass
BTW, the plastic is likely some sort of plasticized PVC, so not highly chemical resistant, but good ...
18-7-2020 at 13:24
by: Dr.Bob
Can common soda glass bottles be reshaped?
I understand the desire to make things, I have tried all my life. But commercial bottles are made ...
17-7-2020 at 17:35
by: Dr.Bob
plastic coated glass
These are common for nasty chemicals and material being shipped in certain cases. Some shipping rul ...
17-7-2020 at 17:23
by: Dr.Bob
Using reactor flasks as desiccators?
Most real reactors are jacketed for easy heating and cooling. Others are designed for a heating ma ...
15-7-2020 at 16:50
by: Dr.Bob
HotPlate Branding
This is junk. Buy a used Corning or similar one, it will have 4 or 5 times the heating ability and ...
14-7-2020 at 11:28
by: Dr.Bob
Using reactor flasks as desiccators?
But you can buy a used real vacuum desiccator for much less than a good reactor, that is 5 times lar ...
14-7-2020 at 07:11
by: Dr.Bob
Sublimation?
I have a few real sublimation apparatti available. Need to take some photos sometime, but if anyo ...
13-7-2020 at 18:09
by: Dr.Bob
Purchasing from research suppliers
I am not familiar with them myself, but many people here have mentioned United Nuclear (https://www. ...
12-7-2020 at 17:00
by: Dr.Bob
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