To distinguish between the following pairs of compounds, which methods would you rather use: UV-Vis, IR or MS. Explain your choice and show your calculations, if applicable. A B
To distinguish between the following pairs of compounds, which methods would you rather use: UV-Vis, IR or MS. Explain your choice and show your calculations, if applicable. A B
Chapter32: Multistep Reaction Sequences: The Conversion Of Benzaldehyde To Benzilic Acid
Section: Chapter Questions
Problem 3Q
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Question
![Woodward-Fieser Rules for the Calculation of π * Absorption Maximum for
Unsaturated Carbonyl compounds
R
α
and
Parent a, ß unsaturated carbonyl compound
(acylic, six member or larger ring ketone) R = alkyl
R
fe
Y
α
5 member ring ketone
Aldehyde (R = H)
Acid or Ester (R = OH or OR)
Each Alkyl substituent
a add
B add
If other double bonds, for each d, y, etc. add
Each exocylic carbon-carbon double bond add
α
В
d
Each extra conjugation add
(do not count double bond as substituent, as this effect is included)
Each homoannular add
Each polar group:
-OH
-O-Ac at a,ß, or d
-OR
λ (nm)
215
202
207
193
10
12
18
5
30
39
35
30
50
6](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcd2d3e41-0b06-49f6-a2d0-b1e8673bda51%2Ffef257bd-1a30-4df3-811e-c73722046317%2Fb62e2k_processed.png&w=3840&q=75)
Transcribed Image Text:Woodward-Fieser Rules for the Calculation of π * Absorption Maximum for
Unsaturated Carbonyl compounds
R
α
and
Parent a, ß unsaturated carbonyl compound
(acylic, six member or larger ring ketone) R = alkyl
R
fe
Y
α
5 member ring ketone
Aldehyde (R = H)
Acid or Ester (R = OH or OR)
Each Alkyl substituent
a add
B add
If other double bonds, for each d, y, etc. add
Each exocylic carbon-carbon double bond add
α
В
d
Each extra conjugation add
(do not count double bond as substituent, as this effect is included)
Each homoannular add
Each polar group:
-OH
-O-Ac at a,ß, or d
-OR
λ (nm)
215
202
207
193
10
12
18
5
30
39
35
30
50
6
![To distinguish between the following pairs of compounds, which methods would you
rather use: UV-Vis, IR or MS. Explain your choice and show your calculations, if
applicable.
A
B](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcd2d3e41-0b06-49f6-a2d0-b1e8673bda51%2Ffef257bd-1a30-4df3-811e-c73722046317%2F8o4b8mi_processed.png&w=3840&q=75)
Transcribed Image Text:To distinguish between the following pairs of compounds, which methods would you
rather use: UV-Vis, IR or MS. Explain your choice and show your calculations, if
applicable.
A
B
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