Look at this enamine:

Which of the following sequence converts benzaldehyde into the given enamine?

1: Oxidation with Cr(VI) compound
2: reaction with pyrrolidine with pH control; acid catalyst
3: $M e M g B r f o l l o w e d b y H_{3} O^{+}$

1; 2; 3

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3; 1; 2

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2; 3; 1

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2; 1; 3

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Solution

The correct option is B
3; 1; 2

From benzaldehyde, somehow use the sequence to get to acetophenone. From there
it is just imine formation using pyrrolidine.

Now, get the methy phenyl ketone to react with pyrrolidine with acid catalyst and pH control:

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Similar questions

Which of the following sequence converts benzaldehyde into phenylacetaldehyde?

1: $P B r_{3}$
2: Mg in THF
3: $N a B H_{4} f o l l o w e d b y H_{3} O^{+}$
4: $H C H O f o l l o w e d b y H_{3} O^{+}$
5: PCC

Observe this compound:

Starting from benzylbromide, which sequence helps synthesize the given (above) compound ?

1: Reaction with $(P h)_{3} P :$
2: Reaction with a super strong base
3: Reaction with cylohexanone

Q. The correct order of reactivity of

P h M g B r

with following compounds will be:

(1) . (C_{6} H_{5})_{2} C O, (2) . C H_{3} - C H = O, (3) . (C H_{3})_{2} C = O

Q. Identify the correct order of boiling points of the following compounds.

(1) C H_{3} C H_{2} C H_{2} C H_{2} O H

(2) C H_{3} C H_{2} C H_{2} C H O

(3) C H_{3} C H_{2} C H_{2} C O O H

There are two scenarios and in either case, we start with 5-oxohexanal. A reagent or sequence of reactions "A"
helps convert the substrate into 6-hydroxyhexan-2-one. On the other hand, a reagent or sequence of reactions "B"
converts the starting compound into 5-hydroxyhexanal. A and B are:

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Look at this enamine: Which of the following sequence converts benzaldehyde into the given enamine? 1: Oxidation with Cr(VI) compound 2: reaction with pyrrolidine with pH control; acid catalyst 3: MeMgBr followed by H3O+

The correct option is B 3; 1; 2 From benzaldehyde, somehow use the sequence to get to acetophenone. From there it is just imine formation using pyrrolidine. Now, get the methy phenyl ketone to react with pyrrolidine with acid catalyst and pH control:

Look at this enamine:

Which of the following sequence converts benzaldehyde into the given enamine?

1: Oxidation with Cr(VI) compound
2: reaction with pyrrolidine with pH control; acid catalyst
3: $M e M g B r f o l l o w e d b y H_{3} O^{+}$

The correct option is B
3; 1; 2

From benzaldehyde, somehow use the sequence to get to acetophenone. From there
it is just imine formation using pyrrolidine.

Now, get the methy phenyl ketone to react with pyrrolidine with acid catalyst and pH control: