Decalin is an example of fused bicyclic systems where two six membered rings share common C-C bond. There are two possible arrangements : trans and cis-decalin.
(i) Draw cis and trans decalin using the chair form for these species
(ii) Which isomer is more stable? Give explanation.
Decalin is an example of fused bicyclic systems where two six membered rings share common C-C bond. There are two possible arrangements : trans and cis-decalin.
(i) Draw cis and trans decalin using the chair form for these species
(ii) Which isomer is more stable? Give explanation.
(i) Draw cis and trans decalin using the chair form for these species
(ii) Which isomer is more stable? Give explanation.
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Stereoisomerism occurs when the bond connectivity is same but the spatial arrangement of more than one type is possible. Stereoisomerism finds vast use in orgaic chemistry, mainly biochemistry as all the biomolecules, are generally stereospecific in their actions. Stereoisomerism in limited not only to organic compounds but also to inorganic compounds, mainly in co-ordination complexes. Stereoisomers include cis and trans isomers, chiral isomers, compound wilth different conformation of chelate rings and other isomers that differ only in the geometry of attachement of the metal ion. Select the incorrect statement:
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Cyclonexane exists its two chair conformations in rapid equilrium at room temperature. Each carbon atom on a cyclohexane ring has one axial and one equatorial hydrogen. Ring-flipping converts axial II's to equatorial H's and vice-versa. In substituted cyclohexane, groups larger than hydrogen are more stable in the equatorial position. The cis isomer has two groups on the same side of the ring, either both up or both down. The trans isomer has two groups on opposite side of the ring one up and one down. Find out most stable conformer of cis-3-fluorocyclohexanol.
Cyclonexane exists its two chair conformations in rapid equilrium at room temperature. Each carbon atom on a cyclohexane ring has one axial and one equatorial hydrogen. Ring-flipping converts axial II's to equatorial H's and vice-versa. In substituted cyclohexane, groups larger than hydrogen are more stable in the equatorial position. The cis isomer has two groups on the same side of the ring, either both up or both down. The trans isomer has two groups on opposite side of the ring one up and one down. Find out most stable conformer of cis-3-fluorocyclohexanol.
A
B
C
D
Cyclonexane exists its two chair conformations in rapid equilrium at room temperature. Each carbon atom on a cyclohexane ring has one axial and one equatorial hydrogen. Ring-flipping converts axial II's to equatorial H's and vice-versa. In substituted cyclohexane, groups larger than hydrogen are more stable in the equatorial position. The cis isomer has two groups on the same side of the ring, either both up or both down. The trans isomer has two groups on opposite side of the ring one up and one down. Which of the following is most stable conformer of 1,2-dichlorocyclohexane?
Cyclonexane exists its two chair conformations in rapid equilrium at room temperature. Each carbon atom on a cyclohexane ring has one axial and one equatorial hydrogen. Ring-flipping converts axial II's to equatorial H's and vice-versa. In substituted cyclohexane, groups larger than hydrogen are more stable in the equatorial position. The cis isomer has two groups on the same side of the ring, either both up or both down. The trans isomer has two groups on opposite side of the ring one up and one down. Which of the following is most stable conformer of 1,2-dichlorocyclohexane?
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B
C
D
All have equal stability
Cyclonexane exists its two chair conformations in rapid equilrium at room temperature. Each carbon atom on a cyclohexane ring has one axial and one equatorial hydrogen. Ring-flipping converts axial II's to equatorial H's and vice-versa. In substituted cyclohexane, groups larger than hydrogen are more stable in the equatorial position. The cis isomer has two groups on the same side of the ring, either both up or both down. The trans isomer has two groups on opposite side of the ring one up and one down. Find out most stable substituted cyclohexane among the following:
Cyclonexane exists its two chair conformations in rapid equilrium at room temperature. Each carbon atom on a cyclohexane ring has one axial and one equatorial hydrogen. Ring-flipping converts axial II's to equatorial H's and vice-versa. In substituted cyclohexane, groups larger than hydrogen are more stable in the equatorial position. The cis isomer has two groups on the same side of the ring, either both up or both down. The trans isomer has two groups on opposite side of the ring one up and one down. Find out most stable substituted cyclohexane among the following:
A
B
C
D
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Borane is an electron deficient compound. It has only six valence eletons, so the boron atom lacks an octet. Acquiring an octet is the driving force for the unusual bonding structure found in boron compounds. As an electron deficient compound, BH_(3) is a strong electrophile, capable of adding to a double bond. This hydroboration of double bond is though to oC Cur in one step, with the boron atom adding to the less highly substituted end of the double bond. In transition state, the boron atom withdraws electrons from the pi bond and the carbon at theother end of the double bond acquires a partial positive charge. This positive charge is more stable on the more highly subsituted carbon atom. The second step is the oxidation of boron atom, removing it from carbon and replacing it with hydroxyl group by using H_(2)O_(2)//OH^(bar(..)) . The simultaneous addition of boron and hydrogen to the double bond leads to a syn addition. Oxidation of the trialkyl borane replaces boron with a hydroxyl group in the same stereochemical position. Thus, hydroboration of alkenen is an example of steropecific reaction, in which different steroisomers of starting compounds react to give different steroisomers of the product. CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH=CH_(2) underset((ii)H_(2)O_(2)//OH^(bar(..)))overset((i)BH_(3)//THF)rarrZ . Z is :
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