Comments for Org Prep Daily

Comment on TLC Staining solutions by milkshake

milkshake — Fri, 14 Jun 2013 14:57:23 +0000

if this detection works, it is a very clever trick

Comment on Oil pump desanguination – brilliant! by milkshake

milkshake — Fri, 14 Jun 2013 14:56:08 +0000

but we don’t – we keep it befouled. With several oil pumps running permanently, someone is going to use it again in a week or two.

Comment on TLC Staining solutions by flammableflower

flammableflower — Fri, 14 Jun 2013 08:57:53 +0000

Curcumin will show up boronic acids, esters and BF3K salts.
http://pubs.rsc.org/en/content/articlepdf/2012/ay/c2ay25346a

Comment on Oil pump desanguination – brilliant! by chirality

chirality — Fri, 14 Jun 2013 06:54:42 +0000

Good luck washing the flask afterwards.

Comment on Oil pump desanguination – brilliant! by MasterChief

MasterChief — Mon, 10 Jun 2013 14:49:06 +0000

I used to use a similar method to remove solvent from full 20L containers to avoid lifting and pouring.

Comment on Knorr pyrrole synthesis by milkshake

milkshake — Mon, 03 Jun 2013 01:30:37 +0000

Ha! Großartig!

(in ’74, my biggest achievement was crawling out of the womb)

Comment on Knorr pyrrole synthesis by Dr John

Dr John — Mon, 03 Jun 2013 00:09:43 +0000

Try sodium dithionite in a near neutral then slightly alkaline solution instead of zinc dust/essigsaure! (Old German paper by Kleinspein)

Reduction occurs at room temp, yields are up (80% I think), and purity is much better with good clean crystals. (Just filter reaction mixture).

Did it in ’74 at Uni!

Awesome!

Comment on This phosphine will get you fired by Never Yet Melted » In the Chem Lab

Never Yet Melted » In the Chem Lab — Sun, 02 Jun 2013 12:54:06 +0000

[…] Glenn Reynolds solidified his nerd credentials by forwarding this oldie-but-goodie chem lab story. […]

Comment on Oil pump desanguination – brilliant! by a. nonymaus

a. nonymaus — Thu, 30 May 2013 14:33:13 +0000

I’d be a bit wary of using Erlenmeyers of that size to pull very viscous liquids unless they’re the polymer-coated safety variety. The stresses in large flasks under vacuum are more severe than small flasks, especially across flat areas like the bottoms of Erlenmeyer flasks. In addition to containing fragments, the polymer coating prevents the glass from getting scratches and dings that serve as crack-formation nidi. It should be no big deal if the oil is hot enough, though.

Comment on Oil pump desanguination – brilliant! by milkshake

milkshake — Wed, 29 May 2013 14:37:18 +0000

its just an improvised trap-reservoir into which you suck the spent oil using house vacuum – just like a filtration setup where you replace Buchner funnel with only a tubing. Look up a picture of “embalming machine” to get an idea