To be aromatic, a molecule must have 4n + 2 n electrons and must have cyclic conjugation. 1,3.5,7,9-Cyclodecapentaene fulfills one of these criteria but not the other and has resisted all attempts of synthesis. Explain.
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- To be aromatic, a molecule must have 4n + 2 πs electrons and must have a planar, monocyclic system of conjugation. Cyclodecapentaene fulfills one of these criteria but not the other and has resisted all attempts at synthesis. Explain.Borole is a particularly unique heterocycle that has gained considerable attention in recent years for its peculiar reactivity. Draw a molecular orbital diagram for the pi system of borole (including the placement of its pi electrons) and provide an analysis of its aromaticity using Hückel's rule denoting whether borole is in fact aromatic, antiaromatic, or nonaromatic. H Borole1, 6-Methanonaphthalene has an interesting 1H NMR spectrum in which the eight hydrogens around the perimeter absorb at 6.9 to 7.3 δ, while the two CH2 protons absorb at -0.5 δ. Tell whether it is aromatic, and explain its NMR spectrum.
- 3- Identify the aromatic compounds and provide justification for your answers: & H N-Aromatic compounds also known as arenes or aromatic are chemical compounds that contain conjugated planar ring system with delocalized pi electron clouds instead of discrete alternating single and double bond. One of the precursor to produce aromatic compounds is arenediazonium.Critize this statementWhich of the following compounds justifications for your answer. V) are aromatic and anti-aromatic? Give i) ii) iii) iv)
- Prove the aromaticity of the following molecules by discussing | d)3. (i) Give the criteria for a compound to be considered as aromatic. (ii) Identify, with explanation the compounds below as aromatic, antiaromatic, or nonaromaticConsider the following compound, which has been synthesized and characterized:(a) Assuming this molecule is entirely conjugated, do you expect it to be aromatic, antiaromatic, or nonaromatic?(b) Why was this molecule synthesized with three tert-butyl substituents? Why not makethe unsubstituted compound and study it instead?(c) Do you expect the nitrogen atom to be basic? Explain. Why doesn’t nitrogen’s lonepair overlap with the double bonds to give a total of six electrons in the pi system?(d) At room temperature, the proton NMR spectrum shows only two singlets of ratio 1:2. The smaller signal remainsunchanged at all temperatures. As the temperature is lowered to -110 °C, the larger signal broadens and separatesinto two new singlets, one on either side of the original chemical shift. At -110 °C, the spectrum consists of threeseparate singlets of areas 1:1:1. Explain what these NMR data indicate about the bonding in this molecule. How doesyour conclusion based on the NMR data agree with…
- Draw a molecular orbital diagram for the pi system of tetrazole (including the piacemen oi iis pi electrons) and provide an analysis of its aromaticity using Hückel's rule denoting whether tetrazole is in fact aromatic, antiaromatic, or nonaromatic. H N° Tetrazole b. Provide a picture of the Highest occupied Molecular Orbital (HOMO) and the Lowest Unnocupied Molecular Orbital (LUMO) of tetrazole depicting the phases of thep orbitals, the bonding, antibonding, and non-bonding interactions.Cyclopropenones are described as having aromatic character. How would you account for this, given that the ring contains three ℼ-electronProve the aromaticity of the molecules given below by discussing them.