Period_8&9

Period_8&9 - Period 8 & 9 Period 8 1 O 2N aq HCl...

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Period 8 & 9 Period 8 1 NH 2 O 2 N aq HCl aq NaNO 2 , 0 o C N O 2 N N Cl A dry diazonium salt is fairly unstable, always explosive. 2 N O 2 N N OH + PH=10 OH N NO 2 N Mechanism O H OH O N O 2 N N O N NO 2 N H OH T. M. Why does the substitution reaction happen at C1 position? O O O O O O O H 1 8 5 4 2 3 7 6 a bc d e f Basically, there are six reasonable resonance structures of 2-naphthol anion, but structure a and b are more stable than the other four because of the 4n+2 conjugated system in these structures. As a result, the C1 position which is a carbanion in b has more opportunities reacting with para-nitrobenzenediazonium, i.e. the substitution reaction happens at C1 position. Period 9 Mutarotation Mutarotation means the change in specific rotation toward an equilibrium value. For example, the reaction shown in the next page demonstrates the mutarotation of α -D-glucopyranose. Suppose a solution of α -D-glucopyranose is prepared, initially the specific rotation of the solution is +112 o . However, the specific rotation of it keeps falling until the value falls to +52.7 o . Why?
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Please look at the following equilibrium. As soon as α
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Period_8&9 - Period 8 & 9 Period 8 1 O 2N aq HCl...

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