(a)
Interpretation: The stereochemistry of given reaction is to be predicted.
Concept introduction: Cycloaddition reactions are pericyclic reactions that take place in two compounds containing pi bonds to form a cyclic compound. These reactions are concerted and stereospecific in nature. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in thermal conditions undergoes reaction in antrafacial fashion and polyene containing odd number of bonds undergo reaction in suprafacial fashion. The total number of bonds present in the
(b)
Interpretation: The stereochemistry of given reaction is to be predicted.
Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.
(c)
Interpretation: The stereochemistry of given reaction is to be predicted.
Concept introduction: Cycloaddition reactions are pericyclic reactions that take place in two compounds containing pi bonds to form a cyclic compound. These reactions are concerted and stereospecific in nature. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in suprafacial fashion and polyene containing odd number of bonds undergo reaction in antrafacial fashion. The total number of bonds present in the alkenes is considered.
(d)
Interpretation: The stereochemistry of given reaction is to be predicted.
Concept introduction: Sigmatropic rearrangements are pericyclic reactions which takes place by concerted mechanism. In these rearrangements migration of sigma bond takes place. According to Woodward-Hoffmann rules, the total number of electron pairs in sigma bond that is broken and the pi bonds that rearrange. The polyene containing even number of electron pairs and bonds in thermal conditions undergoes reaction in antrafacial fashion and polyene containing odd number of electron pairs and bonds undergo reaction in suprafacial fashion.
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Chapter 27 Solutions
ORGANIC CHEMISTRY
- The complex anion in Ba₂[Cr(CN)6] is a tetragonally distorted octahedral complex (Dan). Baz[Cr(CN)6] is paramagnetic at room temperature with S = 1. Assume that the complex is a low-spin complex. a) Identify if the [Cr(CN)6] anionic complex has 4 long and 2 short bonds (left side of figure) or if the complex has 4 short and 2 long bonds (right side of figure) with respect to Oh symmetry. Use crystal field theory to answer this question. Explain/rationalize your decision. Can the provided information decide on the order of orbital energies? Dah Tetragonal Distortion ய Dab z-compression z-elongation x and y elongation O symmetry x and y compression E eg d² dx²-y² t2g dxy dxz dyz Question 4 a) continued: Provide your explanations in the space below. b) At low temperatures Ba₂[Cr(CN)6] is ferromagnetically ordered with a phase transition to a paramagnetic phase at Tc = 150K. Sketch the magnetic susceptibility vs. temperature in the diagram below. Indicate Tc as well as the paramagnetic and…arrow_forwarda) Draw the octahedral mer-[FeCl3(CN)3] complex and determine its point group. Use proper wedges and dashes in order to illustrate 3 dimensional details. Use the point group to determine if the complex has a resulting net dipole moment and describe its allowed direction with respect to its symmetry elements (if applicable). ード M 4- b) Substitute one chlorido ligand in mer-[FeCl3(CN)3] 4 with one fluorido ligand. Determine all possible isomers and their corresponding point groups. Use the point groups to determine if the complexes have resulting net dipole moments and describe their allowed direction with respect to its symmetry elements (if applicable). The number of complex sketches below is not necessarily indicative of the number of isomers. 4- 4- ☐☐☐ c) Substitute two chlorido ligands in mer-[FeCl3 (CN)3] 4 with two fluorido ligands. Determine all possible isomers and their corresponding point groups.. Use the point groups to determine if the complexes have resulting net dipole…arrow_forwardShow work. don't give Ai generated solutionarrow_forward
- Differentiate electron spin and electron spin moment.arrow_forwardDifferentiate between nuclear spin and electron spin.arrow_forwardDraw the trigonal prismatic MH6 molecular compound, where M is a 3d transition metal. a) Draw the trigonal prismatic MH6 molecular compound and determine its point group. b) i. What is the symmetry species for the 4s orbital on the central metal? ii. What is the symmetry species for the 3dx²-y² orbital on the central metal? Note: The z-axis is the principal axis. iii. Suggest a crystal field energy diagram for a d² electron configuration in a trigonal prismatic coordination environment. Label the metal d-orbital with their corresponding symmetry species label. Use the appropriate character table in the resource section.arrow_forward
