Interpretation:
Chiral carbon atoms present in nepetalactone has to be labelled. The number of possible stereoisomers for nepetalactone has to be given and to show that nepetalactone is a terpene.
Concept Introduction:
Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.
Isoprene unit:
Branched end of isoprene – Head
Unbranched end of isoprene - Tail
Chirality: It refers to a Carbon atom in a molecule that contains four different substituents.
Stereoisomers: Two compounds with same molecular formula but different in their orientation are considered as isomers.
Number of possible stereoisomers for a compound can be determined as,
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Chapter 5 Solutions
Organic Chemistry
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- 5. For the molecules below assign the stereochemical configuration of the selected tetrahedral carbon chiral centers (R, S or N (not a chiral center)) and the alkene (E, Z or N (not a stereocenter)) that are indicated by the arrows (note that you do not have to assign the configuration of every chiral center in the molecule). If the atom in question is not a chiral center or is not a stereocenter circle N for neither. b) RSN RSN HO" RSN EZ N RSN НО. H₂N HO HO OH HO OH RSN RSN CH3 НИ H3 CH₂ RSN RSN RSN EZ N RSNarrow_forwardStereoisomers share the same connectivity and differ only in the way their atoms are arranged in space. Draw the structure of a compound that is a stereoisomer of cis-1,2-dimethylcyclobutane.(Note that the question asks for a different stereoisomer of the named compound and not the named compound itself.)Use the wedge/hash bond tools to indicate stereochemistry where it exists.In cases where there is more than one answer, just draw one.arrow_forward(a) Describe the molecular geometry expected for 1,2,3-butatriene (H2C=C=C=CH2). (b) Two stereoisomers are expected for 2,3,4-hexatriene (CH3CH=C=C=CHCH3). What should be the relationship between these two stereoisomers?arrow_forward
- 2. Explain with a couple of acyclic or cyclic examples (5 carbons or more) what is crit- ical for you when establishing whether a molecule is chiral or acral.arrow_forwardPyrethrin II and pyrethrosin are two natural products isolated from plants of the chrysanthemum family. Pyrethrin II is a natural insecticide and is marketed as such. Q,) Label all chiral centers in each molecule and all carbon-carbon double bonds about which there is the possibility for cis,trans isomerism.arrow_forwardDraw a structural formula for 3-chloro-3-methylhexane.arrow_forward
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