n-Butyllithium

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Properties

Safety Information

Use

N-Butyllithium must be calibrated through single titration as follows: 1) Titration solution: 1mol/L SEC butanol/dimethylbenzene solution (butanol and dimethylbenzene must be dried with an activated 5A molecular sieve) 2) Indicator: 2,2-dipyridine 3) Solvent: dimethylbenzene (must be dried with an activated 5A molecular sieve). 4) Operation method: Under the protection of argon, add magneton, 20ml dimethylbenzene and a small amount of indicator into a 100ml 3-lipped bottle with a tipping plug. Then use a precisely marked 2ml injector to swiftly transfer 2ml N-Butyllithium into the bottle (the air in the injector must be replaced with argon, which must then be expelled when collecting the N-Butyllithium; fill and drain the injector in the N-Butyllithium multiple times to prevent any water or air from remaining in the injector). The system should turn a purplish red. Then, wash, dry, and rinse the same injector with titration solution 2-3 times (to prevent any change in the amount added) and titrate the solution until the system turns yellow, and cease titration. 5) Repeat titration once; if the percent error between the two times is within 2%, the result can be regarded as correct. 6) Titration result: titration solution (ml)/2 to obtain N-Butyllithium concentration.