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Topic: Grignard  (Read 3878 times)

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Offline orgo814

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Grignard
« on: July 09, 2015, 11:56:10 PM »
Sorry if this picture is sideways my device has problems uploading correctly.

For this question the answer according to the book is D. I do not see how D is possible. I am getting B when I do this. Thanks for any input

Offline discodermolide

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Re: Grignard
« Reply #1 on: July 10, 2015, 01:27:14 AM »
Alcohols react with Grignard reagents, what do they produce?
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Offline orgo814

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Re: Grignard
« Reply #2 on: July 10, 2015, 08:39:49 AM »
All I know is they can react into carbonyl adding more C-C bonds

Offline Dan

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Re: Grignard
« Reply #3 on: July 10, 2015, 09:48:01 AM »
All I know is they can react into carbonyl adding more C-C bonds

What happens if you add water to a Grignard reagent?
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Offline Babcock_Hall

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Re: Grignard
« Reply #4 on: July 10, 2015, 01:27:54 PM »
Are Grignard reagents acidic, basic, or neutral?

Offline discodermolide

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Re: Grignard
« Reply #5 on: July 10, 2015, 02:32:52 PM »
Grignards are organometallic reagents consequently very reactive towards functional groups with H atoms which can be abstracted to give ...?
Now your molecule has a OH group and an aldehyde, so which is more reactive towards the Grignard reagent?
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Offline orgo814

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Re: Grignard
« Reply #6 on: July 10, 2015, 02:43:36 PM »
So we are proposing that the OH not the aldehyde here and that the de protonated OH group then becomes protonated in the aqueous work up

Offline Babcock_Hall

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Re: Grignard
« Reply #7 on: July 10, 2015, 03:56:15 PM »
Does your hypothesis explain the side product?

Offline discodermolide

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Re: Grignard
« Reply #8 on: July 10, 2015, 05:01:39 PM »
So we are proposing that the OH not the aldehyde here and that the de protonated OH group then becomes protonated in the aqueous work up

What happens to the H of the deprotonated OH?
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Offline orgo814

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Re: Grignard
« Reply #9 on: July 10, 2015, 07:46:13 PM »
H added to ch3 of grignard

Offline discodermolide

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Re: Grignard
« Reply #10 on: July 11, 2015, 01:48:55 AM »
Right, so why is the correct answer (D)? Draw the reactions out.
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