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Topic: Your top 3 organic preps??  (Read 5229 times)

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Offline julianm

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Your top 3 organic preps??
« on: May 16, 2009, 06:48:15 AM »
 I do hope you don`t mind a first post being a survey of your combined  favourites!

I`m looking for 3 absolute bankers of 5-10g scale organic preps. Hopefully they will require a range of simpler techniques, and the products will probably be 2 solids & one liquid. No requirement for too long in reflux, stirrers or fume cupboards, just safe, effective preps suitable for 17 yr old students as an introduction to the genre.  Some different techniques, a small range of functional groups & chance for some discussion about mechanisms on a simple level would be perfect.
 I`m returning to this as a teacher after something of a break & have limited time. My previous experience of say the old A level practical exams has one memory of some beautiful yellow needle-like crystals? - can`t recall what they were, however!
 I suspect benzoic acid might be a good option for one of the 3.
So, for some lovely fluffy white solids, fruity liquid & no miserable dregs of greyish sludge, what should I be trying?
 Many thanks in advance for any offers, your help would be much appreciated!
Julian

Offline StarvinMarvin

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Re: Your top 3 organic preps??
« Reply #1 on: May 16, 2009, 07:11:39 AM »
Making aspirin is very nice :) It's a simple reaction where nothing can go wrong.


Offline azmanam

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Re: Your top 3 organic preps??
« Reply #2 on: May 16, 2009, 08:39:26 AM »
banana oil (isoamyl acetate)
Knowing why you got a question wrong is better than knowing that you got a question right.

Offline nj_bartel

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Re: Your top 3 organic preps??
« Reply #3 on: May 16, 2009, 01:29:20 PM »
banana oil (isoamyl acetate)

Was going to suggest the same thing.

Offline dougdela

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Re: Your top 3 organic preps??
« Reply #4 on: May 17, 2009, 09:25:50 AM »
You can do an "overnight" ester prep that my classes find interesting. Look around for an old bottle of Anthranilic acid (it may be a controlled substance now if you buy it new). It gives an interesting twist on a standard prep of methyl salicylate.
The details (even if you don't have the old stuff) can be found here:
http://www.dougdelamatter.com/website/science/chemistry/demos/7-nose.htm

Best of luck, but TRY IT YOURSELF first before you decide on your classroom (safety) procedures.


Offline julianm

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Re: Your top 3 organic preps??
« Reply #5 on: May 17, 2009, 03:32:13 PM »
 Thanks very much for the replies! I had thought of the aspirin but a range of esters for a class would make a great variety show - I`ll have a run through & check out the hazards carefully....
 Very apprecuiative of your help - I`ll send my students here as well!
 Julian

Offline leaftye

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Re: Your top 3 organic preps??
« Reply #6 on: May 19, 2009, 12:44:02 AM »
I liked the banana oil experiment, but at least one of the girls wasn't crazy about it.  She's allergic to bees and another underlying medical condition could result in death.  She looks perfectly healthy, but it may be something to think about, especially since bees are out and about right now.

Offline alchmx

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Re: Your top 3 organic preps??
« Reply #7 on: May 20, 2009, 03:07:38 PM »
Making wintergreen is very easy, methyl ester of salicylic acid, catalyzed by a drop of sulfuric acid. Makes nice crytals, won't kill anyone either. Don't make soap via saponification of fatty esters, no student will use their soap and there will be lots to dispose of later.

Offline Borek

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Re: Your top 3 organic preps??
« Reply #8 on: May 20, 2009, 03:47:34 PM »
From other place:

Quote
I like "luminol" (and so do the students). My 2nd favorite is "fluorescein" followed by "ethyrosin".  The latter 2   are graded, in part, on neatness.
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