5. Porphyrin is an aromatic compound commonly tound in biomolecules such as heme
ID: 1040040 • Letter: 5
Question
5. Porphyrin is an aromatic compound commonly tound in biomolecules such as heme, vitamin B, and chlorop tye Answer the following questions regarding porphyrin. "Hint: ALL of the carbons and nitrogens are aromatic structure How many pi electrons does porphyrin possess? How many lone pairs of electrons are participating in aromaticity?. omany palrons are NOT paricipating in 2Up HN porphyrin aromaticity?_ Technically, the form of porphyrin bound to Fe?+ in heme is the dianion shown below. Answer these questions regarding the dianion of porphyrin. avomah Tin sp How many pi electrons does the dianion possess? How many lone pairs of electrons are participating in aromaticity? porphyrin dianion How many lone pairs of electrons are NOT participating in aromaticity?Explanation / Answer
Criteria for aromaticity are, it should have cyclic structure, planarity, continuous delocalisation of pi electrons and should obey Huckle's 4n+2 pi electrons rule
Porphyrin = total pi electrons 26 (22 from 11 double bonds and 4 from two lone pairs on nitrogen atoms)
No of lone pairs participating in aromaticity - 2
No lone pairs of Electrons not participating in aromaticity - 2
Porphyrin dianion : It is aromatic since it has 26 pi electrons and obeying all conditions above cited
Total pi electrons - 26(negative charge electrons won't consider as pi electrons and won't participate in aromaticity.
Lone pair participating in aromaticity_2
Electrons not participating in aromaticity - 4 lone pair
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