Two of the carbon positions in the parent chain of carboxylic acids are designated as "a" or "B." • The a and ß designations are not part of the IUPAC naming system, however they are commonly used. The carbons that are designated as carbon number 2 and 3 in the IUPAC system are often referred to as the a carbon and ß carbon, respectively. For example, the a carbon and ß carbon are labeled in the structure of butanoic acid shown on the right. O || β α CH₂CH₂CH₂C-OH 4 3 2 1 In the previous question, you drew the condensed structure for 3-hydroxypentanoic acid: OH O | || CH3CH₂CHCH₂C-OH i) Label the a carbon and ß carbon in the structure that you drew for 3-hydroxypentanoic acid. ii) Name 3-hydroxypentanoic acid using the a/ß designation method. B-hydroxypentanoic acid iii) Draw the condensed structure for a-hydroxypentanoic acid.

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Chapter23: Organic Chemistry
Section: Chapter Questions
Problem 23.70QP
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9.8) Two of the carbon positions in the parent chain of carboxylic acids are designated as "a" or "B."
The a and ß designations are not part of the IUPAC naming system, however they are commonly used.
O
a
β α ||
CH₂CH₂CH₂C-OH
4 3 2 1
The carbons that are designated as carbon number 2 and 3 in the
IUPAC system are often referred to as the a carbon and ß carbon,
respectively. For example, the a carbon and ß carbon are labeled
in the structure of butanoic acid shown on the right.
In the previous question, you drew the condensed structure for 3-hydroxypentanoic acid:
OH O
L ||
CH3CH₂CHCH₂C - OH
Ba
i) Label the a carbon and ß carbon in the structure that you drew for 3-hydroxypentanoic acid.
ii) Name 3-hydroxypentanoic acid using the a/ß designation method. B-hydroxypentanoic acid
iii) Draw the condensed structure for a-hydroxypentanoic acid.
Снз сна сна СНС-он
OH
Transcribed Image Text:9.8) Two of the carbon positions in the parent chain of carboxylic acids are designated as "a" or "B." The a and ß designations are not part of the IUPAC naming system, however they are commonly used. O a β α || CH₂CH₂CH₂C-OH 4 3 2 1 The carbons that are designated as carbon number 2 and 3 in the IUPAC system are often referred to as the a carbon and ß carbon, respectively. For example, the a carbon and ß carbon are labeled in the structure of butanoic acid shown on the right. In the previous question, you drew the condensed structure for 3-hydroxypentanoic acid: OH O L || CH3CH₂CHCH₂C - OH Ba i) Label the a carbon and ß carbon in the structure that you drew for 3-hydroxypentanoic acid. ii) Name 3-hydroxypentanoic acid using the a/ß designation method. B-hydroxypentanoic acid iii) Draw the condensed structure for a-hydroxypentanoic acid. Снз сна сна СНС-он OH
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