From: Paul Handley (p.handley$##$chemistry.uq.edu.au)
Date: Sun Jun 25 2000 - 19:27:23 EDT
>I am trying to distil some older benzylchloroformate (cbz-cl) to use
>in a protection. The contaminants are benyl alcohol and water. I
>have tried distilling it once under vacuum (0.4mm, it is suppose to
>decompose over 105) carefully cutting fractions but most of my major
>component is still contaminated.
>
>Should I distill it from something or dry it over sieves or?
>
>Thank you for your help.
>Rita S. Majerle
>Associate Professor
>From Perrin and Amarego 3rd edition:
"...Greenstein and Winitz [the chemistry of the amino acids vol2 p890
Wiley NY 1961] recommended that the liquid be flushed with a stream of dry
air, filtered and stored over sodium sulfate to remove CO2 and H2O..."
They then discuss distillation twice under vacuum below 85 degrees to
give a product pure by nmr.
Good luck
Paul Handley
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