1
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3answers
48 views
DCPIP: its formula and why it turns pink in acidic solutions
Hello!
I have two short questions about C12H6Cl2NNaO2 • 2 H2O. In this salt the DCPIP ion is negatively charged, having only 6 hydrogen atoms. But in all formulas I've seen for DCP …
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0answers
59 views
Plant extraction
In a recent paper in PNAS
link text
[http://www.pnas.org/content/107/34/15287.abstract Roepke etal were studying the Madagascar periwinkle, a source of very important anti-cancer …
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1answer
100 views
INORGANIC CHEMISTRY
PLEASE WHAT IS THE POSSIBLE PRODUCTS OF THIS REACTION - Iron II Chloride reacting with triphenylphosphine using a non-solvent method of synthesis and also the structures of the lik …
2
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2answers
32 views
Quality of Sodium Triacetoxyborohydride
Are there any effective ways of quality estimation and purification of old (or not so old) Na[BH(OAc)3]?
0
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1answer
120 views
penny experiment (zinc powder + Sodium hydroixide)
When you are doing the penny experiment to turn the outside gold/silver.......can you leave the penny in the soilution (zinc powder + Sodium Hydroxide)....or willl the zinc powder …
1
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1answer
177 views
Ideal organic synthesis
Our Friend and advisor Prof Baran from Scripps published the following in JOC: Aiming for the Ideal Synthesis, doi: 10.1021/jo1006812. In which he makes the following statement
"F …
1
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1answer
115 views
annoying dcm extraction
It's a stupid question but there's one thing which annoys me everytime I do the extraction with solvent heavier than water (e.g. DCM). And this thing is the last drop of solvent wh …
1
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1answer
136 views
Experiences with Mobile NMR and NMR-Mouse?
A recent review discusses mobile nmr for art and cultural history (no subscription, so abstract only). The review cites NMR-Mouse in particular. The manufacturer, ACT, apparently o …
1
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2answers
157 views
Best-Practices for Maintaining a Glovebox
How best to maintain our group's several gloveboxes was taught to me orally by our post-docs, so I thought it might be interesting to see what other traditions are out there.
Mark …
1
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3answers
201 views
Least Reliable Supplier of Synthetic Organic Intermediates and Libraries?
In your experience, who is the least reliable supplier for organic intermediates and libraries?
In my mind, an unreliable supplier:
Waits until well after I place my order befor …
1
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1answer
68 views
how to quench Potassium cyanide?
We meet a serious problem. That is how to quench KCN. Help, please.
1
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1answer
81 views
How does a Itsuno-Corey oxazaborolidone reduction affect a vinyl group?
Surprisingly, during asymmetric reduction of my benzylic ketone (prochiral ) by Itsuno corey reduction, the vinylic (ortho positon)protons are disappearing as per the NMR spectra. …
2
votes
1answer
116 views
Sugar chemistry
Years ago in a project I had to remove 4-hydrazinobenzoic acid (a known human carcinogen isolated from mushrooms) to a level of < 1ppb in a drug substance.We did it but not by t …
0
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2answers
107 views
TLC of Boc-aminoacid: eluent choise
I need to get good resolution of N-Boc-D-Ala-OH and Boc2O by TLC. What eluent would be a proper choice for this operation? I tried Ethyl acetate/Ethanol (2:1) and DCM/Methanol (15: …
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1answer
55 views
ethanol molarity
if you have 35.6 g of CH3CH2OH in 855 ml of H20, whats the molarity?
