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Homework answers / question archive / 1) You attempt to make an oxime derivative for what you think is a ketone, however you don't get any crystals

1) You attempt to make an oxime derivative for what you think is a ketone, however you don't get any crystals

Chemistry

1) You attempt to make an oxime derivative for what you think is a ketone, however you don't get any crystals. What might you do before you repeat the entire derivative synthesis again in exactly the same way? (choose all that apply)

Group of answer choices

 

 

A) Check that for your candidate ketone, the oxime derivative is known - if it's not known, it's likely either unstable or a liquid

 

B) Consider adjusting reaction conditions - if the reaction is water sensitive, consider adding a drying tube. If it's a slow reaction, consider gentle heating.

 

C) Consider a different derivative, or in the case of amines/carboxylic acids, a titration

 

D) Evaporate all of the solvent you used for the recrystallization. That will tell you whether it was the reaction that failed or the recrystallization specifically

 

E) Confirm that you really do have a ketone - if you have an ester, the oxime reaction won't work

 

F) Get a melting point of the crude product you saved from BEFORE the recrystallization. That way you at least have some data that might rule out some compounds.

 

 

2) What might you do if 2 tests appear to contradict each other (choose all that apply)

Group of answer choices

 

 

A) Consider the possibility that your compound could have 2 functional groups (e.g. benzoin has both an alcohol and a ketone)

 

B) Consider if 1 of the tests is prone to false positives or false negatives and consider omitting that test

 

C) Try a 3rd test to break the tie

 

D) Consider if 1 of the tests could have given a wrong result because of a contaminant (such as acetone you just used to rinse the glassware) and retry the test under more rigorous conditions

 

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