What are the mixed melting points of cinnemic acid/urea at 25:75, 50:50 and75:25? I'm not sure that I did it right.
ThanksNicodem - 18-9-2005 at 01:58
Hello,
you surely don't expect any of us to go and measure that for you?
Besides you can't measure the melting point of such a mixture unless it is homogenous and monophasic.
Why would you need such a useless information? (it is actually the curiosity that made me post this)The_Davster - 18-9-2005 at 08:49
It sounds like hello is in some sort of beginning level college or uni organic chem course, and he/she thinks they messed up the first lab of the
course. Melting point labs are always the first lab in an organic chem course.
Am I right?chemoleo - 18-9-2005 at 12:14
Or it is to do with forming some phenylethylamine derivative.
I can even see where a melting point might come in.
[Edited on 18-9-2005 by chemoleo]12AX7 - 18-9-2005 at 14:19
Quote:
Originally posted by Nicodem
Besides you can't measure the melting point of such a mixture unless it is homogenous and monophasic.
So what's an eutectic?
Even if it shows a "mushy state", you have solidus (freezing point, below which all is solid) and liquidus (melting point, above which all
is liquid) points, so it's not an impossible question.
TimNicodem - 18-9-2005 at 14:23
Chemoleo, I also had the same thought but for a Hoffman rearangement you need a satuarated amide and not a cinnamic acid amide. Besides, you need not
to know the m.p. of such a mixture to make the amide since the temperature needed is above the melting point of urea. This information is of no use
whatsoever.
edit: Tim, I agree. What I wanted to say is that I don't feel like we are here to do a whole phasic transition diagram for others. Each do his
own homework.
[Edited on 18-9-2005 by Nicodem]Sandmeyer - 18-9-2005 at 14:34
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