C2H2n Cyclic Alkanes - Lecture Notes | Lecture Note - Edubirdie

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

2021
Views:

171

Pages:

2
Author:

Niklas

Cyclic Alkanes: CₙH₂ₙ n rings were first When Tetrahedral (sp³) hybridized are placed in a ring, the C-C-C bond angle can vary from 109.5°, but there is an E-cast (strain) Strain Considerations: Angle (θ) Strain: Variation of C-C-C angle from 109.5°. Torsional Strain: Important in cyclopropane. Transannular Strain: 8-12 members; cyclic alkanes PE # C in Ring 1. Cyclopropane Rigid More reactive than other cyclic alkanes C-C bonds are weak (~65 kcal/mol) σ-σ C-C (sp³/sp³) Newman Projection: H-H eclipsing Cyclobutane Butterfly Shape Puckered Ring Cyclopentane 9 are close to optimal But there's significant torsional strain No transannular strain Cyclooctane

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