1. At room temperature a pure sample of 2?Pyridinecarboxaldehyde exists in what
ID: 1039250 • Letter: 1
Question
1. At room temperature a pure sample of 2?Pyridinecarboxaldehyde exists in what physical state and appears what color?
a. solid-brown
b. liquid - clear yellow
c. liquid - clear
d. liquid - yellow brown
2. How is it recommended to purify commercially aquired 2?Pyridinecarboxaldehyde?
a. extraction
b. distillation
c. if commericially acquired it will not need to undergo purification
d. chromotography
3. In the tandem Aldol Condensation–Michael Addition sequence the aldol reaction involves which two compounds?
b. 2 molecules of acetophenone and one molecule of 2?Pyridinecarboxaldehyde
2?Pyridinecarboxaldehyde and Acetophenone
4.
In the tandem Aldol Condensation–Michael Addition sequence the Michael Reaction involves which two compounds?
2?Pyridinecarboxaldehyde reacts with Acetophenone
Acetophenone reacts with 2?Pyridinecarboxaldehyde
Acetophenone reacts with the condensation product of 2?Pyridinecarboxaldehyde and acetophenone
2?Pyridinecarboxaldehyde reacts with the condensation product of 2 molecules of acetophenone
5. Michael addition is the addition of a nucleophile to a alpha, beta unsaturated ketone. In this reaction this unsaturation arises from __________________.
6.
Why is 2?Pyridinecarboxaldehyde is employed instead of benzaldehyde in the Tandem Aldol Michael reaction?
2?Pyridinecarboxaldehyde synthon provides a pyridine ring on the alkene after the aldol reaction. This pyridine ring is electron donating and an electron donating groups on the alkene of the of the Michael acceptor facilitates the Michael Reaction.
2?Pyridinecarboxaldehyde synthon provides a pyridine ring on the alkene after the aldol reaction. This pyridine ring is electron withdrawing and an electron withdrawing groups on the alkene of the of the Michael acceptor facilitates the Michael Reaction.
a. molecules of AcetophenoneExplanation / Answer
1 . Liquid _ yellow brown
2.b.distilation.
3. 2 molecluurs of acetophenone and one moleclue of pyridine 2 aldehyde.
4.option c
5.unsaturation aries from condensatation of pyridine 2 aldehyde & acetophenone.
6.option b.
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