From: Teresa Atkinson (tla$##$eskimo.com)
Date: Tue Feb 17 2004 - 12:18:22 EST
I'm a second quarter organic chemistry student. One of our lab
experiments was to prepare triphenylmethanol from benzophenone and a
phenylmagnesium bromide grignard reagent. This is a traditional
To do our lab:
We scrupulously dried our glassware.
We prepared the grignard from bromobenzene and magnesium shavings. The
reagent appeared to form as advertised.
We prepared our benzophenone/ether solution and added it to the
phenylmagnesium bromide grignard to theoretically make impure
triphenylmethanol. A very red solution formed (redder than other
students, although red was the proper color), then a pink powdery adduct
Lab was over for the day.
The next day, we added HCl to our solution to neutralize. Whereas other
students solutions turned yellowish, ours stayed red. I asked the
teacher why ours was red. He didn't know.
After extraction and crystalliztion, the crystallized substance was
still pink in color and the melting point was 151 degrees C. I haven't
yet had a chance to do an IR spectrum on the product, although I will.
Does anyone have ideas about why our product stayed red? Where did we
This lab is similar to the one we performed:
Thanks for any help. Any responses that I use in my lab report will be
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