2
votes
3answers
44 views
What’s a good cleaning procedure for fritted funnels?
I'm going to ask a slightly different question than general cleaning procedures for glassware. Fritted funnels can't go into a base bath, or you'll ruin the glass frit.
So how do …
2
votes
0answers
6 views
solvent pressure in separating funnels
Whenever I do a extraction or wash with say ether or pet ether and water in a sep funnel, I always have to release a lot of excess pressure after each shake. Any reason why? It is …
2
votes
2answers
82 views
What is the Structure of Digitonin?
The Chemspider Blog has been hosting a discussion on the exact structure of the natural product Digitonin:
... There were eleven compounds on ChemSpider called Digitonin. We ha …
0
votes
1answer
20 views
Drawing software for this site
I have answered a few questions already, but can someone please point me in the direction of appropriate drawing software for the site.
I have ChemDraw on my computer.
Thanks
1
vote
5answers
137 views
What’s Special About Microwave Heating?
Few of the papers I've seen on organic synthesis with microwaves as a heat source report a side-by-side comparison with the same reaction in a conventional heat bath. And most reac …
1
vote
1answer
45 views
Purification of 2-cyclopenten-1-one?
Recently, a graduate student at the University of Pennsylvania was looking for a good purification method for 2-cyclopenten-1-one. A few suggestions were made, but not by anyone wh …
2
votes
5answers
101 views
Simple experiments using green chemistry?
Where can I find some simple experiments that demonstrate green chemistry? I'm looking for experiments that can be used either hands-on with students performing them or as a demons …
2
votes
2answers
65 views
Best Practices for Solvent Stills?
Continuously-operated solvent stills have been the cause of many laboratory fires in the last several years. Although alternatives exist, not every lab is willing to upgrade.
Does …
2
votes
2answers
95 views
What’s your favorite preparative organic reaction?
Please supply reaction scheme images for your favorite reactions. I need some good examples to illustrate (using Reaxys) how a given functionality is converted into another functio …
2
votes
2answers
38 views
Practical experience with hydrogenation?
What are key practical tips for doing hydrogenations? What would you tell younger chemists about hydrogenation? Anything from safety to mechanistic insights (such as they are) to p …
3
votes
3answers
139 views
Latex or Nitrile?
It seems that in every lab I've worked, the subject of the relative effectiveness of latex vs. nitrile gloves comes up.
If I'm working with common organic solvents on a routine ba …
2
votes
2answers
37 views
What is a general procedure for TLC?
I would like to write an educational lab that focuses on the identification of compounds using TLC. Could someone recommend where I could get the necessary solvents, silica plates, …
3
votes
6answers
218 views
Things You Won’t Work With?
Derek Lowe has written an excellent series of posts on things he won't work with. Many of the things on his list can really mess you up. Other are just smelly. Neat dimethyl zinc i …
0
votes
2answers
71 views
Best-Practices Procedure for Working with tert-Butyllithium?
The case of Sheharbano (Sheri) Sangji serves as a reminder to respect and understand the materials in a research lab. Even then, things can go wrong.
Where can I find a detailed, …
3
votes
4answers
120 views
What’s your glassware cleaning procedure?
A long time ago, when I was still in organic chemistry, I practically found it better to not try to get the glassware as clean as possible, but do be fine with 99.9% clean (I never …
