Hg Bubblers

Submitted by Chip Nataro / Lafayette College on Mon, 07/14/2008 - 10:50
I can't figure out if I have a unique and good idea or if I just missed the bus.  My guess is I missed the bus a long time ago, but that won't stop me from throwing this nugget out there.  I finally replaced the mercury bubblers in my research lab.  It was time.  I have had people say they use oil bubblers.  I tried that for about a day and really hated the lack of pressure that I was so accustom to.  I had to find another solution.  That's when I found Inert Relief Valves (20 PSI) from Cole-Palmer.  I am sure there are others out there, and I get no money from Cole-Palmer, they just h
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13C NMR of fluorinated aromatics

Submitted by Adam Johnson / Harvey Mudd College on Wed, 07/09/2008 - 11:51

We are having some problems with interpreting our 13C NMR spectra of some fluorinated sulfonamides.  Both p-CF3 and 3,5-di-CF3-aryl.  We are seeing too many peaks and are wondering if we should see 2, 3 and 4 bond coupling to F in our 13C resonances.  We see a quartet for the CF3, and then doublets (or doubled peaks).  Sorry this is a vague description.  Any thoughts or advise?  

Adam 

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Summer Research Co-curriculars and Social Activities

Submitted by Hilary Eppley / DePauw University on Mon, 07/07/2008 - 17:13

OK, not really sure that this question fits well here (it is a little off the wall), but I have just started in a position as the director of our science research honors program, so I am looking for interesting ideas about co-curricular activities or social events to hold in conjunction with our 10-week summer research program.  

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Chillers

Submitted by Barbara Reisner / James Madison University on Sun, 06/22/2008 - 15:06
Does anyone have suggestions for a high quality chiller (preferrably one that can be purchased with a limited budget)?  I have an awesome powder diffractometer but it came with a Haskris chiller (closed loop) that's an absolute lemon.  (My experience had always been that Haskris was the gold standard, but based on some things that I've heard and experienced recently, I've revised my opinion.)  In the past year, it's caused the xrd to crash at least half-a-dozen times.  (Okay, two were related to power outages, but that shouldn't kill a chiller.)  We've rebuilt nearly everything in the
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deuterium labeling in CHN analysis

Submitted by Adam Johnson / Harvey Mudd College on Thu, 06/19/2008 - 17:04

My student sent a labeled compound for CHN analysis.  Her data came back all wrong.  I remembered (in the dim recesses...) that when doing CHN analyses for deuterated compounds, you have to do something different.  But I have no idea what it is.  But, technology has advanced in the intervening years, so I had chemdraw automatically calculate numbers.

Chemdraw calcd for C14H15D6NO2:  %C:  69.67, %H:  11.27, %N:  5.80

Chemdraw calcd for C14H21NO2:  %C:  71.46, %H:  8.99, %N:  5.95

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Asymmetric hydroamination

Submitted by Adam Johnson / Harvey Mudd College on Fri, 03/14/2008 - 01:36
My group works on the asymmetric hydroamination reaction using chiral amino-alcohol ligands.  The ligands are prepared in a few steps from naturally occurring amino acids.  We have observed enantiomeric excesses of about 16% for the ring closing of 2-methyl-2,3-heptylamine (1,1-dimethyl-3-propylamino-allene...hmm, I wish we had a structure tool on the site...)
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