June 14, 2021, 11:16:23 PM
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Topic: Can PCl5 be used to test between alcohol and ketone/aldehyde?  (Read 292 times)

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Offline sharbeldam

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It reacts with alcohols and it also reacts with ketone to give geminal dihalide, but can someone go deeper into the reaction with ketone? does it release gas or change color? can PCl5 be used to test for ketones? id be really happy for detailed answer
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Offline rolnor

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Re: Can PCl5 be used to test between alcohol and ketone/aldehyde?
« Reply #1 on: May 01, 2021, 08:58:32 AM »
I would say no. Its better with IR or NMR.

Offline billnotgatez

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Re: Can PCl5 be used to test between alcohol and ketone/aldehyde?
« Reply #2 on: May 02, 2021, 10:53:28 AM »
I would say no. Its better with IR or NMR.

@rolnor
just curious
What do you think could be done without the nice machines

Offline rolnor

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Re: Can PCl5 be used to test between alcohol and ketone/aldehyde?
« Reply #3 on: May 02, 2021, 12:15:19 PM »
You can use 2,4-dinitrophenylhydrazine as test for ketones and aldehydes, it shows yellow-orange spots on TLC.

Offline Meter

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Re: Can PCl5 be used to test between alcohol and ketone/aldehyde?
« Reply #4 on: May 02, 2021, 03:08:21 PM »
You can use 2,4-dinitrophenylhydrazine as test for ketones and aldehydes, it shows yellow-orange spots on TLC.
I remember doing this as one of my first organic labs. Then Tollens test was used to distinguish between aldehydes and ketones.

Offline rolnor

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Re: Can PCl5 be used to test between alcohol and ketone/aldehyde?
« Reply #5 on: May 02, 2021, 03:59:20 PM »
Also ShiffÅ› reagent is selective for aldehydes;
https://en.wikipedia.org/wiki/Schiff_test

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