4. The scheme below shows the reaction of a ketone, 2-propanone with methanol. :0 : : OH OH CH, - CH3 CH3 C-CH3 CH,-C-CH3 step 1 step 2 step 3 P CH,OH CH3 CH,OH step 4 OCH, - H,0 CH, Ċ–CH3 R CH;-C-CH3 step 7 step 6 step 5 ÓCH, OCH3 i) Write the missing structures (N, O, Q and R) in the above reaction scheme. ii) Name the class of compounds P and S belong to? iii) This is an acid catalyzed reaction. What does this statement mean? iv) Draw the arrow diagram in step 6 to show how intermediate R is formed? Write the equation for this step ONLY. v) Steps 3 and 7 involve loss of a proton from the intermediate ions. Why is this step necessary?

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4. The scheme below shows the reaction of a ketone, 2-propanone with methanol.
ОН
:0 :
||
CH;-C-CH3
: ОН
+ H
- Н
CH,-C-CH3
CH;-C-CH3
N
step 1
step 2
step 3
P
CH;OH
CH3
CH;OH
step 4
OCH,
CH,-C-CH3
H
- H,0
R
CH;-C-CH3
step 7
step 6
step 5
OCH3
OCH;
i) Write the missing structures (N, O, Q and R) in the above reaction scheme.
ii) Name the class of compounds P and S belong to?
iii) This is an acid catalyzed reaction. What does this statement mean?
iv) Draw the arrow diagram in step 6 to show how intermediate R is formed? Write the
equation for this step ONLY.
v) Steps 3 and 7 involve loss of a proton from the intermediate ions. Why is this step
necessary?
Transcribed Image Text:4. The scheme below shows the reaction of a ketone, 2-propanone with methanol. ОН :0 : || CH;-C-CH3 : ОН + H - Н CH,-C-CH3 CH;-C-CH3 N step 1 step 2 step 3 P CH;OH CH3 CH;OH step 4 OCH, CH,-C-CH3 H - H,0 R CH;-C-CH3 step 7 step 6 step 5 OCH3 OCH; i) Write the missing structures (N, O, Q and R) in the above reaction scheme. ii) Name the class of compounds P and S belong to? iii) This is an acid catalyzed reaction. What does this statement mean? iv) Draw the arrow diagram in step 6 to show how intermediate R is formed? Write the equation for this step ONLY. v) Steps 3 and 7 involve loss of a proton from the intermediate ions. Why is this step necessary?
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