panziandi - 17-9-2008 at 04:36
I have about 750mL of VERY OLD t-butyldiphenylchlorosilane. The contents of the bottle are quite viscous clearly undergone hydrolysis etc.
Now it has a b.p. of 90*C 0.01mmHg (i have an idea it boils at 157*C atm but I can't find a reference for that!), it does fume a bit when you open the
lid, so I am expecting there may well be some of the chlorosilane in there.
Would people throw it away? or would you try to clean it up? I am thinking I may distil it under argon or CO2 or something collecting the fraction
boiling at the correct temperature.
Now I have used silanes and other organo-Si before but never had to distil 750mL of crude chlorosilane. Do people think the crud will be hard to
remove from the flask (I'm imagining high boiling silcones will be a nightmare to deal with). Will it all be a waste of time do people think?
ScienceSquirrel - 17-9-2008 at 07:44
I would expect it to be fairly viscous, like a thin oil as the molecular weight is quite high.
If it boils at 90C under 0.01mm Hg then I would attempt to distill a small amount under vacuum.
Cleaning up a small amount of goo is easier than getting rid of a bucket full 
panziandi - 17-9-2008 at 07:53
Well looking through the bottle it is rather cloudy possibly with a precipitate lingering towards the bottom of the bottle. Possibly more consistent
with a slightly watered down glucose syrup consitency! Indeed you have a point about the bucket, I'm just worried the whole lot may be useless goo
(not worried if it is it didn't cost me anything!)