[millsware]

I'm trying to make 2,3-diamino-2,3-dimethylbutane, using this procedure: http://onlinelibrary.wiley.com/doi/10.1002/1521-3765(20010504)7:9%3C2007::AID-CHEM2007%3E3.0.CO;2-7/abstract

It says that after extracting into DCM, the solvent is distilled off and the remaining oil is dried with pentane.  What does that mean?  There is no drying step up to that point. 

[Dan]

It sounds as though it might be a trituration to induce crystallisation and remove residual DCM.

I agree it is unclear and "dried" is probably not the right word.

[408]

I agree with Dan, sometimes an organic will like to hold on to some residual solvent making it an oil.  Adding pentane sucks the solvent out of the oil giving a filterable solid precipitate. 

[Wastrel]

It does seem corrupted but they may mean dry.  A possibility is dissolving it in pentane and drying with something like anhydrous sodium sulphate (*if* it dissolves) or it may mean replacing the distilling head with a Dean-Stark trap and azeotroping with pentane.

Hopefully you are making this stuff downwind of me.