Organic Chemistry! What are the equations for the reaction of 2,4 dinitrophenylhydrazine with....?

Question

a) butanal and b)cyclohexanone

Answer 1

Look at:

ref: http://en.wikipedia.org/wiki/Image:Brady%27s-reagent-mechanism.png

then replace the top R, and R' groups (top right picture) with a) C3H9 and H

In b) you have to replace the R and R' groups 5 CH2 groups in a circle to form the closed cyclohexyl ring.

Answer 2

Cyclohexanone 2 4-dinitrophenylhydrazone

Answer 3

butanal = CH3CH2CH2CHO

remove the oxygen on C=O, and double bond the C to the hydrazine (by removing the 2 hydrogen atoms on N), the by- product is water.

CH3CH2CH2CH=N-NH-(2,4)-Dinitrobenzene

Cyclohexanone

cyclohexane=N-NH-(2,4)-Dinitrobenzene

Answer 4

The adducts are formed with the carbonyl carbon.

Answer 5

its impossible to write the eqns here. Extremely sorry.

however lets try. assuming that u'll be able to make out what I am tryin to say.

CH3CH2CH2CHO + H2NNH - C6H4(NO2)2 = > CH3CH2CH2CH=N-NH-C6H4(NO2)2 + H2O



.....O
.....||
.. ./...\
...|... .| +H2NNH - C6H4(NO2)2=
.. .\ . /


.....NNH - C6H4(NO2)2
.....||
. ../...\
...|... .| + H2O
.. .\ ./