View alcanos_ from CIENCIAS D at Marista University of Guadalajara. Estructura y conformaciones de los alcanos Conformacin Eclipsada. Estereoqumica de Cicloalcanos disustituidos: ESTABILIDAD DE LOS CICLOALCANOS Adolf. Calores de combustión: Alcano + Oxígeno Geometría molecular, Isomería conformacional, Conformación del ciclohexano, Tensión angular. La isomería ye una propiedá d’aquellos compuestos químicos n’especial les pero’l ciclohexano ye un alcano cíclicu o cicloalcano y el 1-hexeno ye un alqueno. . Los isómeros conformacionales xeneralmente nun son xebrables o.
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This kind of interference between two bulky groups is called steric strain or steric hindrance. Conformations of Cyclopropane Caption: To convert between ce two conformations, the molecule must pass through the unstable half-chair conformation. The Newman projection looks straight down the carbon-carbon bond. Same Length Chains Caption: The only intermolecular force of nonpolar molecules are London dispersion forces which result from induced dipole attractions.
To relieve ring strain, cyclopentane adopts the envelope conformation. Chair interconversion would still produce an cicloalxanos and an equatorial methyl. Alcanos ramificados tienen p. The ring strain of a planar cyclobutane results from two factors: 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
Longer chained alkanes have greater surface area and can have more surface contact and more induced dipoles than branched alkanes with smaller surface areas.
Conformations of Cyclohexane Caption: Los botones se encuentran debajo. Compare this actual structure with the hypothetical planar structure in Figure Rotations about the center bond in butane give different molecular shapes.
Chair-chair interconversion of methylcyclohexane.
Cyclobutane adopts the folded conformation to decrease the torsional strain caused by eclipsing hydrogens. The other eclipsed conformations are lower in energy than the totally eclipsed conformation but are still more unstable than the staggered conformations.
Boat Conformation of Cyclohexane Caption: The totally eclipsed conformation is about 1.
Alcanos y Cicloalcanos by Adrian Marcelo Giurno on Prezi
Esta interferencia es llamada interacciones 1,3-diaxial. The torsional energy of confprmacional is lowest in the staggered conformation. Chair Conformation of Cyclohexane Caption: Any carbon with four sigma bonds has an sp3 hybridization. This puckered conformation reduces the eclipsing of adjacent CH2 groups.
The C-C bond distance is 1. Substituents on a carbon chain are called alkyl groups.
Nomenclature of Alkyl Groups Caption: Conformational Analysis of Propane Caption: The simplest alkane is methane, CH4. Their physical properties resemble those of alkanes. The Newman projection is the best way to judge the stability of the different conformations of a molecule.
Torsional energy of propane. This interference is called a 1,3-diaxial interaction.
Estructura y Estereoquímica de Alcanos
In this case both chairs have the same energy, and they are present in equal cicloalcanps. Ethane has two sp3 carbons. Regardless of the other groups present, the most stable conformation has a t-butyl group in an equatorial position. The melting point curve for n-alkanes with even numbers of carbon atoms is slightly higher than that for alkanes with odd numbers of carbons.