Match structures from the previous question to a functional group name. Answers

Question

Match structures from the previous question to a functional group name. Answers may be repeated. ____ ____ ____ ____ enamine hemiaminal imine iminium not a.-d. What is the third intermediate in the acid catalyzed reaction of methanal and excess methanol? Only charged intermediates are shown. All intermediate in question 11 can be considered to be a(n)? acetal enol hemiacetal hydrate oxonium Only 2 intermediates in question 11 can be considered to be a protonated form of which functional group? oxonium hydrate hemiacetal enol acetal

Explanation / Answer

11. The intermediate formed in the ac id catalyzed reaction of methanal and excess methanol would be,

e.

this is second protonation to give good leaving group H2O

12. All intermediates above can be considered as hydrates as they all have H2O in the system

d.

13. Only two intermediates shown above are considered as,

c.

Hemiacetal with an -OH and an -OCH3 attached to the carbon

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