The Tour of Collective Wisdom presents:
Can you use it right out of the bottle?


Some reagents must be purified because they are sold at low purity. Other organic compounds or reagents decompose extremely quickly and cannot be used right out of the bottle; they must be purified often. Finally, some compounds exist as dimers or trimers in the bottle and must be "cracked" prior to use.

Reagent:
Should this reagent be purified before use? yes no
Verification:

Reagent Should this reagent be purified before use? Number of responses Percent who think this reagent should be purified before use
Acetic Anhydride yes no 76 46%
BF3.Et2O yes no 67 32%
BH3-Me2S yes no 5 0%
Cobalt octacarbonyl 95% in hexane yes no 33 15%
HMPA yes no 79 51%
N-bromosuccinimide yes no 127 68%
acetaldehyde yes no 101 81%
acrylic acid yes no 40 65%
carbon disulfide yes no 27 14%
chlorotrimethylsilane yes no 116 53%
copper(I) salts yes no 57 45%
cyclopentadiene yes no 37 100%
m-cpba yes no 107 24%
mesyl chloride yes no 97 36%
methyl or ethylchloroformate yes no 78 20%
oxalyl chloride yes no 4 75%
para-toluenesulfonyl chloride yes no 31 25%
pyridine yes no 103 65%
sodium hydride/60% dispersion in mineral oil yes no 128 37%
thionyl chloride yes no 125 33%
tri-n-butylphosphine yes no 67 52%
triethylamine/alkylamines in general yes no 141 76%
triflic anhydride yes no 35 60%