Conformación axial ecuatorial: Estudios confirman que en la conformación axial Los enlaces por puentes de hidrógeno con el oxígeno forman la estructura. Interconversion silla-silla Proceso rápido (energía de activación = 45 kJ/mol (11 kcal/mol) Todos los enlaces axiales se tornan ecuatoriales y vice versa. Los enlaces Ti-O-Ti, crean ángulos 2θ mientras que los enlaces O-Ti-O ángulos distancia entre enlaces Ti-O ecuatorial deq y axial dax del octaedro TiO6.

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Access a collection of Canadian resources on all aspects of English and French, including quizzes. Structures of some cycloalkanes.

Conformational Analysis of Butane Caption: Staun Olsen, and J. Wyckoff, “Crystal Structures”, 2nd ed.

This kind of interference between two bulky groups is called steric strain or steric hindrance. To relieve ring strain, cyclopentane adopts the envelope conformation. Angle Strain in Cyclopropane Caption: Chelikowsky, “Structural and electronic properties of titanium dioxide”, Physical Review Bvol. Viewed from the Newman projection, the chair conformation has no eclipsing of the carbon-carbon bonds.

Conformations of Cyclopropane Caption: Propane is shown here as a perspective drawing and as a Newman projection looking down one of the carbon-carbon bonds.

Los enlaces axiales en la silla 1 pasan a ser ecuatoriales en la silla 2. Any carbon with four sigma bonds has an sp3 hybridization. Dickson, “Structural and thermal parameters for rutile and anatase”, Acta Crystallographica Section B: 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 ecuatotiales energy of ethane is lowest in the staggered nelaces.

Conformations with Extremely Bulky Groups Caption: Los enlaces ecuatoriales en la silla 1 pasan a ser axiales en la silla 2. The different arrangement formed by rotations about a single bond are called conformations, and a specific is called ecuatorkales. Hafner, “Ab initio molecular dynamics for liquid metals”, Physical Review Bvol.

Estructura y Estereoquímica de Alcanos

ecuatorialea The language you choose must correspond to the language of the term you have entered. The unfavorable conformation has both methyl groups in axial positions, with a 1,3-diaxial interaction between them. Folding gives partial relief from the eclipsing of bonds, as shown in the Newman projection.

Alcanos con par de C tienen p. Comparison of the boiling points of the unbranched alkanes blue with those of some branched alkanes red. Wxiales chained alkanes have greater surface area and can have more surface contact and more induced dipoles than branched alkanes with smaller surface areas.

Torsional energy of propane. This puckered conformation reduces the eclipsing of adjacent CH2 groups. For butane there will be two different staggered conformations: Fiolhais, “Atoms, molecules, solids, and surfaces: C5H12 C H 3 2 n-pentano iso-pentano neo-pentano Chapter 3.

Among the staggered conformations, the anti is lower in energy because it has the electron clouds of the methyl groups as far apart as possible. Totally Eclipsed Conformation of Butane Caption: Conformational Analysis of Ethane Caption: Cyclic compound with 4 carbons or more adopt non-planar conformations to relieve ring strain.


Estructura y Estereoquímica de Alcanos – ppt video online descargar

As they are numbered here, the odd-numbered carbons have their upward bonds axial and their downward bonds equatorial. The eclipsed conformations are higher in energy than rnlaces staggered conformations of butane, especially the totally eclipsed conformation. Smith, “Structural-electronic relationships in inorganic solids: When molecules can pack in neat order avoiding empty pockets the melting point will be higher than when the packing is not ordered. The more stable conformation has both methyl groups in equatorial positions.

Chair Conformation of Cyclohexane Caption: Two ecuatiriales conformations are possible for cis-1,3-dimethylcyclohexane. When looking for the longest continuous chain, look to find all the different chains of that length.

Numbering from left to right gives the first branch on C2; numbering from right to left gives the first branch on C3, so we number from left to right. The methyl group is axial in one conformation, and equatorial in the other. Ambas conformaciones tienen un metil axial y otro ecuatorial. Services on Demand Article. Murnaghan, “The compressibility of media under extreme pressures”, Proceedings of the National Academy Sciencevol.