Conformational Analysis Newman Projections Ring Strain Cyclohexane Conformations
Conformational Analysis Newman Projections Ring Strain Cyclohexane Conformations
Views of Ethane 1.10A H-109.6°、/ H 1C H 154A H H ethane ethane ethane
Views of Ethane
The Newman Projection H Back carbon Front carbon Sawhorse Newman representation projection 2004 Thomson/Brooks Cole
The Newman Projection
Rotational Conformations of Ethane Newman projections: 0=0° HH H、0=60 H H H H H H H H H Sawhorse structures: H H H H H H H H H H eclipsed,0=0° staggered,0=60° skew,0=anything else
Rotational Conformations of Ethane
Definitions Conformations-Different spatial arrangments that a molecule can adopt due to rotation about sigma bonds. ● Staggered-A low energy conformation where the bonds on adjacent atoms bisect each other(600 dihedral angle), maximizing the separation. Eclipsed-A high energy conformation ● where the bonds on adjacent atoms are aligned with each other(0 dihedral angle)
Definitions • Conformations - Different spatial arrangments that a molecule can adopt due to rotation about sigma bonds. • Staggered - A low energy conformation where the bonds on adjacent atoms bisect each other (60o dihedral angle), maximizing the separation. • Eclipsed - A high energy conformation where the bonds on adjacent atoms are aligned with each other (0o dihedral angle)