Concept explainers
Interpretation:
The chiral center in the molecular model of thalidomide is to be identified and its absolute configuration as R or S is to be determined.
Concept introduction:
When a tetrahedral carbon atom is connected to four different atoms or groups, then that carbon is called a chiral carbon or chiral center.
The absolute configuration is the three-dimensional spatial arrangement of substituents attached to a chiral center.
The Cahn-Ingold-Prelog rule system lists the substituents bonded to the chiral center in the order of decreasing atomic number. A higher atomic number has a higher priority over a lower atomic number for the substituent.
When there are two identical atoms directly attached to the chirality center, then they are ranked on the basis of the
If an atom has multiple bonds, it is considered to be replicated as a substituent on that atom.
If isotopes are present, they are ranked on the basis of their
The molecule is oriented such that the lowest ranked group points away from the observer.
If the remaining three groups in order of decreasing priority trace a clockwise path, the configuration is R.
If the remaining three groups in order of decreasing priority trace a counter clockwise path, the configuration is S.
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ORGANIC CHEMISTRY-PACKAGE >CUSTOM<
- The acid-base indicator HX undergoes the following reaction in a dilute aqueous solution: HX (color 1) H+ + X- (color 2). The following absorbance data were obtained for a 0.00035 M solution of HX in 0.1 M NaOH and 0.1 M HCI. Measurements were made at wavelengths of 450 nm and 620 nm using a 1.0 cm glass cuvette. 450 620 A(460 nm) A(630 nm) 0.1 M NaOH 0.1 M HCI 0.065 0.435 0.895 0.150 In the 0.1M NaOH solution, the indicator will be almost 100% in the X- form, while in 0.1M HCI, the indicator will be nearly 100% protonated (HX). Calculate the acid dissociation constant for the indicator if a pH=5 buffer solution containing a very small amount of indicator exhibits an absorbance of 0.567 at 450 nm and 0.395 at 620 nm (measured in a 1 cm glass cuvette).arrow_forwardShow work...give the name of the given compound. Don't give Ai generated solutionarrow_forwardShow work with explanation needed. don't give Ai generated solutionarrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning