Download Wade03 estructura y estereoquimica de alcanos . leccin 5. alcanos y cicloalcanos – orgnica 2 leccin 5. Documents. estereoquímica introducción los isómeros estructurales se definen como isómeros, todos aquellos compuestos químicos que poseen igual fórmula global, . Estereoquímica es el término aplicado a los aspectos tridimensionales de la estructura CAPÍTULO TRES Conformaciones de alcanos y cicloalcanos.

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The anti conformation is lowest in energy, and the totally eclipsed conformation is highest in energy. Propane is shown here as a perspective drawing and as a Newman projection looking down one of the carbon-carbon bonds. The four hydrogen atoms are covalently bonded to the central carbon atom, with bond lengths of 1.

Bridged rings share two nonadjacent Cs. The eclipsed conformation is about 3. The staggered conformations are lower in energy than the eclipsed conformation because the staggering allows the electron clouds of the C-H bonds to be as far apart as possible.

Estructura y Estereoquímica de Alcanos

Comparison of the boiling points of the unbranched alkanes blue with those of some branched alkanes red. Any carbon with four sigma bonds has an sp3 hybridization. In the actual molecule, the boat conformation is skewed to give the twist boat, a conformation with less eclipsing of bonds and less interference between the two flagpole hydrogens.


These conformations have equal energies, and they are present in equal amounts. The different arrangement formed by rotations about a single bond are called conformations, and a specific is called conformer. They are named by replacing the -ane ending of the alkane with -yl.

Wade03 estructura y estereoquimica de alcanos – [PPT Powerpoint]

There is steric hindrance between these hydrogens so the molecule twists a little producing the twist boat conformation which is 1. The Newman Projection of Propane Caption: Much like ethane the staggered conformations of propane is lower in energy than estereoquomica eclipsed conformations.

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The axial bonds are directed vertically, parallel to the axis of the ring. Number the carbons, starting closest to the first branch. Boat Conformation of Cyclohexane Caption: If there are two possible chains with the same number of carbons, use the chain with the most substituents.

Butano tiene 2 conformaciones alternadas diferentes: Alcanos ramificados tienen p. Conformational Analysis of Butane Caption: Torsional strain in cyclopropane. Since the methyl group occupies more space than a hydrogen, the torsional strain will be 0.


Post on Apr views. Because of their smaller surface areas, branched alkanes have lower boiling points than unbranched alkanes.

Los botones se encuentran debajo. La eclipsada es 3. The six-membered rings in cis- and trans-decalin assume chair conformations.

The angle strain and the torsional strain in cyclopropane make this ring size extremely reactive. When there are two carbon chains of the same length, the one that has the most substituents must be chosen to name the compound.

Wade03 estructura y estereoquimica de alcanos

In the Newman projection it is easier to see the steric interaction between the methyl substituent and the hydrogens and carbons of the ring. The bond angles are Use di- tri- etc. Name the groups attached to the chain, using the carbon number as the locator. Conformations of Cyclopentane Caption: The conformation of cyclopentane is slightly folded, like the shape of an envelope.

Two chair conformations are possible for cis-1,3-dimethylcyclohexane.