For each of the species below, identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.) 1. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) 2. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) Submit Answer Retry Entire Group 9 more group attempts remaining Show Hint Cengage Learning Cengage Technical Support F4 DII F5 F6 $ % 5 6 R T Y об г 7 U PrtScn F8 8 Previous Next Email Instructor Save Home End PgUp PgDn F9 F10 F11 F12 ( 9 P ว Ins Ba

For each of the species below, identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.) 1. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) 2. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) Submit Answer Retry Entire Group 9 more group attempts remaining Show Hint Cengage Learning Cengage Technical Support F4 DII F5 F6 $ % 5 6 R T Y об г 7 U PrtScn F8 8 Previous Next Email Instructor Save Home End PgUp PgDn F9 F10 F11 F12 ( 9 P ว Ins Ba

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter18: Aromaticity

Section: Chapter Questions

Problem 6CTQ

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For each of the species below, identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.) 1. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) 2. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) more proup attenpts remaning Submit Answer Retry Entire Group
For each of the species below, identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.) 1. HB HN BH ΝΗ A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na)
For each of the species below, identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non- aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.) Q 1. A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na) 2. CH3 A.Electrons in a cyclic conjugated system. B.The compound is (a, aa, or na)
For each of the species below, identify any cyclic conjugated system, then: A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugated). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.)
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2. A. Determine the number of electrons in a system of cyclic conjugation (zero if no cyclic conjugation). B. Specify whether the species is "a"-aromatic, "aa"-anti-aromatic, or "na"-non-aromatic (neither aromatic nor anti-aromatic). (Presume rings to be planar unless structure obviously prevents planarity. If there is more than one conjugated ring, count electrons in the largest.) CH3 a. b. C. d. e. f. i. g. h. :0: IZ :O: N: 3. Specify the number of isomers possible for the following molecules. a. Dichloronitrobenzene? b. An aromatic compound with formula C,H,Cl C. Tribromobenzoic acid
2. Draw two separate Frost circle (polygon-in-a-circle) diagrams for both the cycolopropenyl cation and anion shown below. Label the respective orbitals as bonding or anti-bonding (do not show shaded orbital pictures, only show the MO energy levels and -electrons). In both cases provide a rationale indicating whether the compound is aromatic, anti- aromatic, or non-aromatic. H E E H
Question 3
1. With regards to the following heterocycles, please answer the questions below: A 'N' 1 2 4 -N A HH 6. 7 9 10 + .N N. 11 12 13 14 15 нн 16 17 18 19 a) Define which of the heterocycles is aromatic, non aromatic, or antiaromatic. Small TIP: write down all the lone pairs on heteroatoms before applying Hückel's rule. b) Provide the IUPAC names for heterocycles 1, 4-5, 8, 10. c) Provide the common name for heterocycles 1, 4-5, 8, 10-11, 14-15, 19-20. 20 IzJ
5).. pu n Draw an Aufbau (energy level) diagram for the r-bonding system in following species. Properly label each of the pi (T) orbitals as , mmb, or t orbitals. Identify the compound as aromatic or anti-aromatic based on the diagram. NO explanation necessary.