01:160:308 Lecture Notes - Lecture 23: Antibonding Molecular Orbital, Transmittance, Ion

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crimsonox864

17 Apr 2018

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In a cumulated diene, the 2p orbitals of the bonds do not overlap; so they do not conjugate: the two conjugated double bonds in a conjugated diene are. 20. 2 electrophilic addition to conjugated dienes: conjugated dienes undergo both 1,2- and 1,4- addition reactions with electrophiles, often giving mixtures of both kinds of products. 20. 3 uv-visible spectroscopy: the ultraviolet region of the electromagnetic spectrum has wavelengths extending between 200nm and 400nm, and the visible region has wavelengths extending between 400nm to. 700nm: uv and visible spectral data are plotted as absorbance (a) versus wavelength, where absorbance is calculated as = . Page 2 of 5: the molar absorptivity (extinction coefficient) as a function of wavelength is characteristic for a molecule and is based on the functional groups within the molecule. If the molar absorptivity is known for a given molecule, its concentration in solution can be calculated using the beer-lambert.

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Addition to Conjugated DienesConjugated dienes are molecules in which there are two double bonds separated by one single bond. This orientation of double bonds increases the stability of the molecules in comparison to similar alkane or alkene molecules. Conjugated dienes can participate in many of the same addition reactions as their alkene counterparts.Part AThe first step of an addition to a conjugated diene involves the addition of an electrophile to form a resonance stabilized allylic cation. Draw both resonance structures of the allylic cation formed when one molecule of adds to the symmetrical diene, 3,4-dimethylhexa-2,4-diene.

Use valence bond theory to describe the bonding and geometry in theSeF4 molecule.

A. The central atom is Se, which has five electron groups around it(four bonding pairs and one nonbonding/lone pair). Theelectron-group geometry is trigonal bipyramidal (and the moleculargeometry is see-saw). To facilitate this geometry, the Se atom'sorbitals are hybridized as sp3d orbitals. Four of these hybridorbitals contain one of Se's 6 valence electrons each, and thesehybrid orbitals overlap with unhybridized p orbitals of the four Fatoms. The fifth hybrid orbital of Se contains a lone pair ofelectrons. There are 4 sigma bonds and 0 pi bonds in thismolecule.
B. The central atom is Se, which has six electron groups around it.The electron-group geometry is octahedral. To facilitate thisgeometry, the Se atom's orbitals are hybridized as sp3d2 orbitals.Four of these hybrid orbitals contain one of Se's 6 valenceelectrons each, and these hybrid orbitals overlap with unhybridizedp orbitals of the four F atoms. The fifth and sixth hybrid orbitalsof Se contain lone pairs of electrons. There are 4 sigma bonds and0 pi bonds in this molecule.
C. The central atom is Se, which has four electron groups aroundit. The electron-group geometry is tetrahedral. To facilitate thisgeometry, the Se atom's orbitals are hybridized as sp3 orbitals.These hybrid orbitals overlap with unhybridized p orbitals of thefour F atoms. There are 4 sigma bonds and 0 pi bonds in thismolecule.
D. The central atom is Se, which has four electron groups aroundit, two single bonds and two double bonds. The electron-groupgeometry is tetrahedral. To facilitate this geometry, the Se atom'sorbitals are hybridized as sp3 orbitals. These hybrid orbitalscontain one electron each of Se's 6 valence electrons, and thesehybrid orbitals overlap with unhybridized p orbitals of the four Fatoms. The final 2 electrons of Se's 6 valence electrons reside inunhybridized p orbitals, which overlap with unhybridized p orbitalsof the F atoms. There are 4 sigma bonds and 2 pi bonds in thismolecule.

1)for this experiment, what is the theoretical yield, balanced chemical equation, mechanism, and flowchart of the procedure? I have pictures of a bunch of mechanisms and reactions below, I'm just not sure which one is for part C of the experiment. Also, regarding the theoretical yield, if it doesn't apply please write in the answer it doesn't apply. lastly, I'm not sure what to write for the flowchart so any help with that will be very appreciated.

reactions/mechanisms:

procedures:

(I'm not doing the above part, but it might be needed for theoretical yield)

part c:

01:160:308 Lecture Notes - Lecture 23: Antibonding Molecular Orbital, Transmittance, Ion

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