shungun
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#1
Report Thread starter 11 years ago
#1
well there is no thread for chem 4...can we discuss???
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annarchy
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#2
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It was depressing. It has ruined my life by making me miss my offer grades. There's a discussion on the Chemistry board, I certainly don't want one here :'(
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liakwen
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#3
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it wasnt that bad, but i reall do not wan to get too confident. If you dont mind i may post my unofficial marksceheme here.
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eug.galeotti
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#4
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How was the paper? I didn't sit it.
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shungun
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#5
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(Original post by liakwen)
it wasnt that bad, but i reall do not wan to get too confident. If you dont mind i may post my unofficial marksceheme here.
yes sure...go ahead and post your unofficial markscheme....

well...the paper was ok...

how did you do the converting ethanal to hydroxypropanoic acid??? i thought that part was hard...and it was 4 marks...
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eug.galeotti
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#6
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#6
ethanal to hydroxypropanoic acid?

I'm guessing that that should involve a grignard reagent or some substitution reaction like that.

I've completely forgotten everything in Unit 4...
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shungun
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#7
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well yes...grignard reagent shd be used but is there such thing where a grignard's R group is an alcohol??? because i didnt know that...i wrote this really long proces with like 6 steps i guess for 4 marks...dont know...whts the right answer...
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eug.galeotti
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#8
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i think i know the solution.

you need to make an alpha-hydroxyacid through a cyanohydrin. that's the solution.

u get a nucleophilic attack of a cyanide (from KCN and HCN), and you form your propylcyanohydrin. then react with water to provide the carboxylic group needed to make hydroxypropanoic acid.
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aster100
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#9
Report 11 years ago
#9
(Original post by eug.galeotti)
i think i know the solution.

you need to make an alpha-hydroxyacid through a cyanohydrin. that's the solution.

u get a nucleophilic attack of a cyanide (from KCN and HCN), and you form your propylcyanohydrin. then react with water to provide the carboxylic group needed to make hydroxypropanoic acid.
old timer :p:

They're called hydroxynitriles now!
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eug.galeotti
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#10
Report 11 years ago
#10
we still prefer it old school: cyanohydrins...

That's how I roll.
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