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Which range for a good refractometer?
No refractometers measure the bending of light, not the rotating of light. You need a polarimeter f ...
14-10-2021 at 05:54
by: Dr.Bob
Which range for a good refractometer?
I think I have a rather nice old one in a box somewhere, if anyone is interested in one in the US. ...
12-10-2021 at 17:19
by: Dr.Bob
Glycine anhydride, its preparation and cleavage to a dipeptide
Making the anhydride of most amino acids scrambles the stereochemistry (racemizes them). So for mo ...
4-10-2021 at 12:24
by: Dr.Bob
Non-polar chromaphores
The test mixture that we used to use included nitroacetophenone, nitroaniline, nitroanisole and a fe ...
30-9-2021 at 06:45
by: Dr.Bob
Big Glassware Sale!
I sent you an email with an interested person if you have much left.
27-9-2021 at 15:57
by: Dr.Bob
Mystery Glassware Identification Thread
I have seen the flasks with two inlet/outlets used as vacuum traps for aspirators, you hook the bott ...
23-9-2021 at 18:35
by: Dr.Bob
Filtering hot saturated solutions - ideas wanted
Here are some examples of these:

https://www.amazon.com/Chemglass-Filter-Buchner-Jacketed-Porosit ...
18-9-2021 at 18:36
by: Dr.Bob
Synthesis of diethyl diethylmalonate
I have actually alkylated diethylmalonate before (with a complex alkylating agent, not ethyl bromide ...
18-9-2021 at 18:31
by: Dr.Bob
Filtering hot saturated solutions - ideas wanted
The make porcelin buchner funnels which are jacketed for heating or cooling, I have a few of them, a ...
17-9-2021 at 07:09
by: Dr.Bob
Plants High in Triglycerides
Canola, aka rapeseed, oil, is good for biodiesel and grows in Canada, not sure how well in Alaska. ...
1-9-2021 at 10:45
by: Dr.Bob
Hand vacuum pump vs mechanical
I second that, a mechanical vacuum pump will barely work for an easy filtration, but not for a disti ...
30-8-2021 at 10:39
by: Dr.Bob
DCM OTC 2021
JJay,

if you can swing by the Raleigh area of NC sometime, I can meet up with you and help you g ...
25-8-2021 at 12:24
by: Dr.Bob
DCM OTC 2021
JJay where in the US are you now? I have lots of old DCM based paint stripper left from some large ...
24-8-2021 at 16:33
by: Dr.Bob
Science equipment looking for a home
I don't think I have any good stirring hotplates currently, but I do have a stirrer only left right ...
10-8-2021 at 15:30
by: Dr.Bob
Stirrer bearing and vacuum, adapter?
If you want to hold a themometer, there are adapters for that which work well and can hold a therm u ...
5-8-2021 at 12:49
by: Dr.Bob
How to chemically digest meat into AAs?
I have cleaved peptides with 2N HCl at 60C for several hours, there are many variations of that rout ...
2-8-2021 at 16:27
by: Dr.Bob
Science equipment looking for a home
Also just found a box of runner stoppers, from 00 to about 12 or so, some are solid, some have one h ...
29-7-2021 at 17:50
by: Dr.Bob
Science equipment looking for a home
just found another box of lab clamps. Mostly large 3 prong ones, about 10 or 12, some like new, so ...
27-7-2021 at 16:42
by: Dr.Bob
The perfect washbottle - which one should I get?
The Corning design should hold a vacuum if you grease the tapered joint. Those are excellent ones. ...
8-7-2021 at 16:51
by: Dr.Bob
Mystery Glassware Identification Thread
Electokinetic,

They appear to be reservoirs for chromatography columns to me. You can screw th ...
8-7-2021 at 16:49
by: Dr.Bob
Have just started a scientific glassblowing company in eastern Washington state
He repaired a box of glassware for me, and did a fine job. I had forgotten to post a not e here, b ...
7-7-2021 at 18:45
by: Dr.Bob
Protecting groups for tertiary amines
You could also oxidize the tert amine to the N-oxide and that would stable and then reduce it back l ...
6-7-2021 at 17:48
by: Dr.Bob
Chemically resistent pump
Look at FMI pumps, they make a variety of pumps for chemicals, some of which might work. They are ...
14-6-2021 at 11:15
by: Dr.Bob
Science equipment looking for a home
Thanks for the notes. I just felt like posting it somewhere, as he out lived most of his friends ...
11-6-2021 at 04:08
by: Dr.Bob
Science equipment looking for a home
Have some sad news. My friend Ed passed away last week at 96 years.

He was my first chemistr ...
9-6-2021 at 18:17
by: Dr.Bob
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