(b)This compound, called azonine,has 10 electrons in a completely conjugated planar mono-cyclic psystem and therefore satisfes Hückel’s rule for (4n12) pelectrons where n52.There are 8 pelectrons from the conjugated tetraene and 2 electrons contributed by the nitro-gen unshared pair.(c)Borazole, sometimes called inorganic benzene,is aromatic.Six pelectrons are contributedby the unshared pairs of the three nitrogen atoms. Each boron contributes a porbital to main-tain the conjugated system but no electrons.(d)This compound has 8 pelectrons and is not aromatic.11.47The structure and numbering system for pyridine are given in Section 11.21, where we are also toldthat pyridine is aromatic. Oxidation of 3-methylpyridine is analogous to oxidation of toluene. Themethyl side chain is oxidized to a carboxylic acid.11.48The structure and numbering system for quinoline are given in Section 11.21.
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