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12/9/17 química la química es la ciencia que estudia la materia, su composición, la organización de los elementos que la forman las transformaciones que. Isomería C8H FR. Felipe Rodriguez. Updated 14 November Transcript. Isómeros. C8H A continuación,. observarán.. La fórmula. -Isomería estructural- Ejemplo: La isomería estructural es importante dentro del estudio de la química orgánica ya que permite conocer la.

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They are named by replacing the -ane ending of the alkane with -yl.

The angle compression for butane is quiimica The following figure shows the severe steric interactions in a chair conformation with a t-butyl group axial. Butano tiene 2 conformaciones alternadas diferentes: To convert between these two conformations, the molecule must pass through the unstable half-chair conformation.

Either of the chair conformations of trans-1,3-dimethylcyclohexane has one methyl group in an axial position and one in an equatorial position.

Isomería cis-trans

Often, the longest chain with the most substituents is not obvious. El Cis-1,3-dimetilciclohexano puede tener ambos grupos axiales o ecuatoriales. This puckered conformation reduces the eclipsing of adjacent CH2 groups. Conformations of Cyclopentane Caption: Conformational Analysis of Propane Caption: As they are numbered here, the odd-numbered carbons have their upward bonds axial and their downward bonds equatorial. Chair Conformations of trans-1,3-Dimethylcyclohexane Caption: Torsional strain in cyclopropane.

Totally Eclipsed Conformation of Butane Caption: Since the methyl group occupies more space than a hydrogen, the torsional strain will be 0. Conformations of Ethane Caption: The chair conformation is most stable, followed by the twist boat. The anti conformation is lowest in energy, and the totally eclipsed conformation is highest in energy.


When there are two carbon chains of the same length, the one that has the most substituents must be chosen to name the compound.

Estructura y Estereoquímica de Alcanos – ppt video online descargar

Substituents on a carbon chain are called alkyl isomeriaa. The angle strain and the torsional strain in cyclopropane make this ring size extremely reactive. Some conformations can be more stable than others.

The C-C bond orhanica is 1. La eclipsada es 3. The six-membered rings in cis- and trans-decalin assume chair conformations. To make this website work, we log user data and share it with processors.

Alkanes with an even number of carbons pack better than those with an odd number of carbons. The most irganica conformation is the chair because it has all the C-H bonds staggered. C5H12 C H 3 2 n-pentano iso-pentano neo-pentano Chapter 3. Cyclobutane adopts the folded conformation to decrease the torsional strain caused by eclipsing hydrogens.

Axial hydrogens are pointed straight up or down, parallel to the axis of the ring.

When a bond of propane rotates, the torsional energy varies much like it does in ethane, but with 0. In this case both chairs have the same energy, and they are present in equal amounts. Cyclohexanes with tertiary-butyl substituents show that an axial t-butyl group is severely hindered.

This interference is called a 1,3-diaxial interaction. The torsional energy of ethane is lowest in the staggered conformation. The other eclipsed conformations are lower in energy than the totally eclipsed conformation but are still more unstable than the staggered conformations. Angle Strain in Cyclopropane Caption: Three of these conformations are given specific names.


When orrganica can pack in neat order avoiding empty pockets the melting point will be higher than when the packing is not ordered. The axial substituent interferes with the axial hydrogens on C3 and C5.

Isomería C8H18 by Felipe Rodriguez on Prezi

Cyclohexane can adopt four non-planar conformations: Melting Points of Alkanes Caption: 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.

The four hydrogen atoms are covalently bonded to the central carbon atom, with bond lengths of 1. Same Length Chains Caption: Pure conformers cannot be isolated in most cases, because the molecules are constantly rotating through all the possible conformations. Comparison of the boiling points of the unbranched alkanes blue with those of some branched alkanes orbanica.

Conformational energy of cyclohexane.

Alcanos ramificados tienen p. Newman Projection of Methylcyclohexane: