Lecture 4 Notes - Patterns Of Resonance | Lecture Note - Edubirdie

University:
York University
Course:
CHEM 1000 | Chemical Structure
Academic year:

2021
Views:

490

Pages:

3
Author:

Niklas

Lecture 4 (01/21/21) Patterns of Resonance: Allylic Lone Pairs: "centers" 3c, 4e Allylic Cations: 3c, 2e Lone pair on a Heteroatom adjacent to a Positively charged C center: X = N, O, S, halogen Example: H | H-C=C-H ↔ H-C≡C-H⁺ | H 4. X=Y ↔ X-Y ↔ X-Y Arene/Aromatic Ring: (ring; 6π; but not 4π) Benzene (Arene) All sp2 Hybridized 6. Benzylic Cations/Anions/Radicals: CARBON directly Attached to an Arene CH3 | Benzene-C Benzylic position Benzylic methyl group Toluene CATION: H H \ / C⁺ / \ H H Charge IS Delocalized! 7. Allylic Systems w/ >1 Double Bond H H \ / C=C-C / \ H H diene

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