Ch. 7 - Structure and Synthesis of Alkenes; Elimination

Wade9th EditionOrganic ChemistryISBN: 9780135213728당신이 사용하는 게 아니라요?교과서 변경

Wade 9th Edition

Ch. 7 - Structure and Synthesis of Alkenes; Elimination

문제 8i

7장, 문제 8i

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.
(i)

검증된 단계별 안내

Identify the structure of cyclodeca-1,5-diene. It is a 10-membered carbon ring with two double bonds located at the 1st and 5th positions.

Determine if the compound can exhibit geometric isomerism. Geometric isomerism occurs in alkenes when there are different substituents on the carbon atoms involved in the double bond, allowing for cis-trans or E-Z isomerism.

For cyclodeca-1,5-diene, examine the double bonds. Each double bond in a ring can potentially show geometric isomerism if the ring is large enough to allow for different spatial arrangements.

Draw the possible geometric isomers. For each double bond, consider the spatial arrangement of the substituents around the double bond. In a ring, this can be more complex due to the ring's constraints.

Assign the E-Z configuration to each double bond. Use the Cahn-Ingold-Prelog priority rules to determine the priority of the substituents attached to the double-bonded carbons. Assign 'E' if the higher priority groups are on opposite sides and 'Z' if they are on the same side.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Geometric Isomerism

Geometric isomerism, also known as cis-trans isomerism, occurs in compounds with restricted rotation around a bond, typically a double bond or within a ring structure. This results in different spatial arrangements of substituents, leading to distinct isomers. Understanding geometric isomerism is crucial for identifying and drawing all possible isomers of a compound.

E-Z Nomenclature

The E-Z system is a method of naming geometric isomers based on the priority of substituents attached to the double-bonded carbons. 'E' (from the German 'entgegen') indicates that the higher priority groups are on opposite sides, while 'Z' (from 'zusammen') means they are on the same side. This system provides a clear and systematic way to name and differentiate isomers.

Cycloalkenes

Cycloalkenes are cyclic hydrocarbons containing one or more carbon-carbon double bonds. The presence of a ring structure can restrict rotation, making geometric isomerism possible. In cycloalkenes like cyclodeca-1,5-diene, the size of the ring and the position of the double bonds are critical factors in determining the possibility and number of geometric isomers.

관련 실천

교과서 질문

How many stereogenic double bonds are in octa-1,3,5-triene? How many stereocenters are there? Draw and name the four stereoisomers of octa-1,3,5-triene.

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교과서 질문

Draw the six stereoisomers of octa-2,4,6-triene. Explain why there are only six stereoisomers, rather than the eight we might expect for a compound with three stereogenic double bonds.

2228

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교과서 질문

Teflon-coated frying pans routinely endure temperatures that would cause polyethylene or polypropylene to oxidize and decompose. Decomposition of polyethylene is initiated by free-radical abstraction of a hydrogen atom by O₂. Bond-dissociation energies of C—H bonds are about 400 kJ/mol, and C—F bonds are about 460 kJ/mol. The BDE of the H—OO bond is about 192 kJ/mol, and the F—OO bond is about 63 kJ/mol. Show why Teflon (Figure 7-5) is much more resistant to oxidation than polyethylene is.

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교과서 질문

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.

c. 3-bromo-2-methylhex-3-ene

d. penta-1,3-diene

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교과서 질문

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.

e. 3-ethyl-5-methyloct-3-ene

f. 3,7-dichloroocta-2,5-diene

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교과서 질문

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.

(g)

(h)

1137

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Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system. (i)

비슷한 문제에 대한 검증된 영상 답변:

주요 개념

Geometric Isomerism

E-Z Nomenclature

Cycloalkenes

Some of the following examples can show geometric isomerism, and some cannot. For the ones that can, draw all the geometric isomers, and assign complete names using the E-Z system.
(i)