1 When epoxides react, they undergo ring-opening by a cleavage of the C-O bond. Why is it easier to break a C-O bond of an epoxide compared to breaking a C-O bond of other ethers? A. A more stable carbocation is formed when an epoxide ring-opens. B. Breaking the epoxide C-O bond relieves the strain of a three-member ring. C. Epoxide ring opening conforms to a faster E2 mechanism. D. Mechanistically, the epoxide carbon always becomes protonated, enhancing it's ring opening reactivity. 2. Which of the following is NOT an organometallic compound? A. CHỊCH,CH,Li (CH3)₂Zn D. K*[O-C(CH3)3)] B. (CH₂CH₂),Pb C. 3. Which carbon-metal bond has the largest ionic character? (Given: electronegativities: C 2.5, Al 1.5, Mg 1.2, Zn 1.6, Cu 1.9)
1 When epoxides react, they undergo ring-opening by a cleavage of the C-O bond. Why is it easier to break a C-O bond of an epoxide compared to breaking a C-O bond of other ethers? A. A more stable carbocation is formed when an epoxide ring-opens. B. Breaking the epoxide C-O bond relieves the strain of a three-member ring. C. Epoxide ring opening conforms to a faster E2 mechanism. D. Mechanistically, the epoxide carbon always becomes protonated, enhancing it's ring opening reactivity. 2. Which of the following is NOT an organometallic compound? A. CHỊCH,CH,Li (CH3)₂Zn D. K*[O-C(CH3)3)] B. (CH₂CH₂),Pb C. 3. Which carbon-metal bond has the largest ionic character? (Given: electronegativities: C 2.5, Al 1.5, Mg 1.2, Zn 1.6, Cu 1.9)
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![1 When epoxides react, they undergo ring-opening by a
cleavage of the C-O bond. Why is it
easier to break a C-O bond of an epoxide compared to
breaking a C-O bond of other ethers?
A. A more stable carbocation is formed when an epoxide
ring-opens.
B. Breaking the epoxide C-O bond relieves the strain of a
three-member ring.
C. Epoxide ring opening conforms to a faster E2
mechanism.
D. Mechanistically, the epoxide carbon always becomes
protonated, enhancing it's ring
opening reactivity.
2. Which of the following is NOT an organometallic
compound?
A. CH,CH,CH,Li
(CH3)₂Zn D. K [O-C(CH3)3)]¯
3. Which carbon-metal bond has the largest ionic character?
(Given: electronegativities: C 2.5,
Al 1.5, Mg 1.2, Zn 1.6, Cu 1.9)
A. C-Zn B. C-Mg C. C-Cu
A
4 Which of the following is the correct mechanism for epoxide
ring opening in basic solution
(hydroxide catalyzed) ? Choose either A or B.
CH₂
70%
CH₂
H-O-H
B. (CH₂CH₂) Pb C.
e
:OH
CH: CH₂
✪.
H
B
•
H-O-H
CH₂
CH;
:0:
D. C-Al
:OH
:OH
CH₂
CH₂
:OH :OH
CH;
CH2
:OH :OH](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff8fe35d2-5358-4f99-80d3-e9019afde4cc%2F0b7c0278-0f9b-4946-b208-07fa4bf9ee7b%2Fcs6om1j_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1 When epoxides react, they undergo ring-opening by a
cleavage of the C-O bond. Why is it
easier to break a C-O bond of an epoxide compared to
breaking a C-O bond of other ethers?
A. A more stable carbocation is formed when an epoxide
ring-opens.
B. Breaking the epoxide C-O bond relieves the strain of a
three-member ring.
C. Epoxide ring opening conforms to a faster E2
mechanism.
D. Mechanistically, the epoxide carbon always becomes
protonated, enhancing it's ring
opening reactivity.
2. Which of the following is NOT an organometallic
compound?
A. CH,CH,CH,Li
(CH3)₂Zn D. K [O-C(CH3)3)]¯
3. Which carbon-metal bond has the largest ionic character?
(Given: electronegativities: C 2.5,
Al 1.5, Mg 1.2, Zn 1.6, Cu 1.9)
A. C-Zn B. C-Mg C. C-Cu
A
4 Which of the following is the correct mechanism for epoxide
ring opening in basic solution
(hydroxide catalyzed) ? Choose either A or B.
CH₂
70%
CH₂
H-O-H
B. (CH₂CH₂) Pb C.
e
:OH
CH: CH₂
✪.
H
B
•
H-O-H
CH₂
CH;
:0:
D. C-Al
:OH
:OH
CH₂
CH₂
:OH :OH
CH;
CH2
:OH :OH
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Introduction
Epoxides are cyclic ethers that contain a three-membered ring consisting of two carbon atoms and one oxygen atom. They have unique chemical properties due to the ring strain caused by the angle strain of the C-O-C bond angle. Epoxides can undergo ring-opening reactions, which make them versatile intermediates in organic synthesis. They are widely used as building blocks in the production of various organic compounds such as pharmaceuticals, agrochemicals, and polymers.
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