Concept explainers
a)
Interpretation:
Fischer projections of the following molecules are to be given.
The S enantiomer of 2-bromobutane.
Concept introduction:
In Fischer projection formula, a tetrahedral carbon is represented by two crossed lines. The horizontal line represents bonds coming out of the page and vertical lines represent bonds moving in to the page.
For assigning R or S configuration, the four groups attached to the chiral center are arranged in the order of priority by applying sequence rules. The molecule is then oriented in such a way that the group of lowest priority points away from the viewer. If the arrangement of highest priority to second highest priority to third highest priority is clockwise then R configuration is assigned. If the arrangement of highest priority to second highest priority to third highest priority is counterclockwise then S configuration is assigned.
To show:
Fischer projections of the following molecules.
The S enantiomer of 2-bromobutane.
b)
Interpretation:
Fischer projections of the following molecules are to be given.
The R enantiomer of alanine.
Concept introduction:
In Fischer projection formula, a tetrahedral carbon is represented by two crossed lines. The horizontal line represents bonds coming out of the page and vertical lines represent bonds moving in to the page.
For assigning R or S configuration, the four groups attached to the chiral center are arranged in the order of priority by applying sequence rules. The molecule is then oriented in such a way that the group of lowest priority points away from the viewer. If the arrangement of highest priority to second highest priority to third highest priority is clockwise then R configuration is assigned. If the arrangement of highest priority to second highest priority to third highest priority is counterclockwise then S configuration is assigned.
To show:
Fischer projections of the following molecules.
The R enantiomer of alanine.
c)
Interpretation:
Fischer projections of the following molecules are to be given.
The R enantiomer of 2-hydroxypropionic acid.
Concept introduction:
In Fischer projection formula, a tetrahedral carbon is represented by two crossed lines. The horizontal line represents bonds coming out of the page and vertical lines represent bonds moving in to the page.
For assigning R or S configuration, the four groups attached to the chiral center are arranged in the order of priority by applying sequence rules. The molecule is then oriented in such a way that the group of lowest priority points away from the viewer. If the arrangement of highest priority to second highest priority to third highest priority is clockwise then R configuration is assigned. If the arrangement of highest priority to second highest priority to third highest priority is counterclockwise then S configuration is assigned.
To show:
Fischer projections of the following molecules.
The R enantiomer of 2-hydroxypropionic acid.
d)
Interpretation:
Fischer projections of the following molecules are to be given.
The S enantiomer of 3-methylhexane.
Concept introduction:
In Fischer projection formula, a tetrahedral carbon is represented by two crossed lines. The horizontal line represents bonds coming out of the page and vertical lines represent bonds moving in to the page.
For assigning R or S configuration, the four groups attached to the chiral center are arranged in the order of priority by applying sequence rules. The molecule is then oriented in such a way that the group of lowest priority points away from the viewer. If the arrangement of highest priority to second highest priority to third highest priority is clockwise then R configuration is assigned. If the arrangement of highest priority to second highest priority to third highest priority is counterclockwise then S configuration is assigned.To show:
The S enantiomer of 3-methylhexane.
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Chapter 25 Solutions
Organic Chemistry
- Identify the configuration of the stereogenic center (R or S)arrow_forwardHow many chiral centers does prostaglandin E2 have? Assign R,S configurations to these centers.arrow_forward3b) (i) Using Fischer projection, draw all the stereoisomers of 3-chloro-2-hydroxypentanoic acid. ii) Assign the chiral centre(s) with R/S configurations in part (b)(i). Indicate which areenantiomers, diastereomers and meso compounds (if any).arrow_forward
- Assign R or S configuration to each chirality center in the following molecular model of the amino acid isoleucine (blue = N):arrow_forwardLithocholic acid is an A–B cis steroid found in human bile. Draw lithocholic acid showing chair conformations, as in Figure 27-11, and tell whether the hydroxyl group at C3 is axial or equatorial.arrow_forwardDraw compounds that fit the following descriptions: (a) A chiral alcohol with four carbons (b) A chiral carboxylic acid with the formula C5H10O2 (c) A compound with two chirality centers (d) A chiral aldehyde with the formula C3H5BrOarrow_forward
- (a) assign R or S configuration to each chiral center, (b) Which compound are enantiomers? (c) Which compounds are diastereomers?arrow_forward2. Draw one regioisomer and one stereoisomer and assign R/S for chiral centers. Galantamine Structurearrow_forwardIdentify pairs of molecules that represent enantiomers and diastereomers and identify each center stereogenic by writing R or S next to it.arrow_forward
- Draw Fischer projections for the product(s) formed by reaction of d-ribose with the following. In addition, state whether each product is optically active or inactive Q. C6H5NH2arrow_forwardDraw Fischer projections for the product(s) formed by reaction of d-ribose with the following. In addition, state whether each product is optically active or inactive Q. HNO3, warmarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning