CCl4 is practically unavailable and very expensive in the US, even from companies that only sell to businesses and universities. I have
always used alternatives when adapting procedures that call for it.
Sigma's prices are generally very high, but I've found that in a few cases the cost justifies it. Anhydrous solvents, for instance. Other companies'
septum sealed bottles are simply inferior to Sigma's SureSeal bottles. I've checked water levels with Karl Fischer titration and never found a bottle
from Sigma to be out of spec, while bottles made by Acros or Alfa-Aesar have had orders of magnitude more water than they were supposed to before even
being used. This can make or break water sensitive reactions. When you're doing research on a professional lab budget, you need to be able to trust
the quality of your reagents, and it's worth paying for it.
Also, most universities and large companies have pricing deals with Sigma and the other big companies so the prices you see on the public site are not
what they actually pay. |