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Topic: What is a "good" yield?  (Read 4261 times)

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Offline miss_molecule

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What is a "good" yield?
« on: April 16, 2009, 11:42:08 PM »
Hi!

I am writing a chemistry report, and in the discussion part, we have to discuss our yields.

The first step is to make a functional group interconversion on the ketone in ethyl acetoacetate, to protect it from reagents used in step two. Acid catalysed formation was used to form a cyclic ketal from the ketone and ethane-1,2-diol. My yield was 65%.
Second step was to perform a Grignard reaction on the ester in product [A]. My yield here was 47%.

I know I can`t expect a 100% yield, but what is a good yield? Is there somewhere i can find values for this? Or can I calculate an expected percentage yield?

Hope someone can help me :-*

Offline nj_bartel

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Re: What is a "good" yield?
« Reply #1 on: April 16, 2009, 11:58:00 PM »
Just from my own experience, I'd say the acetal formation yield is great, as I'm assuming you didn't distill out water as it was produced (should be much higher if you distilled out water during reaction).  The grignard yield seems low to me - you probably didn't thoroughly dry your reaction solution.

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