Can you use it right out of the bottle?

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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

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 119 39%
Acrolein yes no 21 80%
Alkyl halides (-Br & -I especially) yes no 19 31%
Aniline and derivatives yes no 30 56%
BF3.Et2O yes no 101 34%
BH3-Me2S yes no 32 12%
Benzaldehyde yes no 22 77%
Cobalt octacarbonyl 95% in hexane yes no 44 15%
DMSO (dimethylsulfoxide) yes no 39 33%
HMPA (hexamethylphosphoramide) yes no 117 58%
LDA (lithium diisopropylamide) yes no 19 57%
N-bromosuccinimide yes no 160 71%
N-iodosuccinimide yes no 16 87%
Potassium Hydride (comes as dispersion in mineral oil) yes no 31 22%
acetaldehyde yes no 120 79%
acetic anhydride yes no 17 35%
acrylic acid yes no 56 62%
carbon disulfide yes no 40 15%
chlorotrimethylsilane yes no 140 56%
copper(I) salts yes no 76 50%
cyclopentadiene yes no 67 92%
m-CPBA (meta-chloroperoxybenzoic acid) yes no 140 23%
mesyl chloride yes no 120 34%
methyl or ethylchloroformate yes no 98 24%
para-toluenesulfonyl chloride yes no 60 30%
pyridine yes no 136 63%
sodium hydride/60% dispersion in mineral oil
(should it be washed?) 		yes no 157 37%
thionyl chloride yes no 155 34%
tri-n-butylphosphine yes no 78 48%
triethylamine/alkylamines in general yes no 169 77%
triflic anhydride yes no 63 53%