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
1-Octene yes no 22 45%
Acetic Anhydride yes no 150 39%
BF3·Et2O yes no 136 38%
BH3·Me2S yes no 54 22%
Cobalt octacarbonyl 95% in hexane yes no 69 24%
Ethyl chloroformate yes no 32 59%
HMPA yes no 131 58%
KHMDS yes no 35 31%
N-bromosuccinimide yes no 199 70%
THF yes no 86 84%
acetaldehyde yes no 160 78%
acrylic acid yes no 83 63%
carbon disulfide yes no 71 22%
chlorotrimethylsilane yes no 171 55%
copper(I) salts yes no 111 46%
cyclopentadiene yes no 121 91%
dimethyl acetylenedicarboxylate (DMAD) yes no 12 25%
diphenylacetic acid yes no 32 34%
m-CPBA yes no 166 27%
mesyl chloride yes no 151 35%
methyl or ethylchloroformate yes no 127 27%
oxalyl chloride yes no 67 47%
para-toluenesulfonyl chloride yes no 91 32%
pyridine yes no 184 67%
sodium hydride/60% dispersion in mineral oil yes no 197 33%
thf yes no 10 90%
thionyl chloride yes no 190 34%
tri-n-butylphosphine yes no 108 37%
triethylamine/alkylamines in general yes no 217 77%
triflic acid yes no 53 56%
triflic anhydride yes no 93 50%