Aromaticity Definition and 11 Threads

Hello everybody :) I have a problem understanding the different types of pi -> pi * transition of organic compounds. I can't understand what's the difference between K-band, B- band, and E-bands, and I cannot find any explanation on the internet. Also I don't understand why benzene has two E...

1. Homework Statement : please refer to the picture attachedHomework Equations : [/B]A compound is aromatic if it is planar and it satisfies Huckles 4n+2 Π electron rule.The Attempt at a Solution : [/B] Option A is not correct...I don't know why...just speaking from intuition..probably its not...

My professor drew the following molecule on the board and asked us how many pi electrons this aromatic molecule has. Everyone in the class said 14, as there are 7 double bonds, with two pi electrons from each bond. He told us that there are only 10 pi electrons in this molecule, refused...

Are ortho substituted benzene rings aromatic in nature as the planarity in such compounds breaks due to steric hindrance ?

Why is diphenol aromatic? Shouldn't it be anti aromatic as it has even pair of pie electrons?

From the resonance structures of Naphthalene, 1-2 Bond has more double Bond character than 2-3 Bond. In March's Advanced organic chemistry, its given that ozone preferentially reacts with 1-2 Bond. But the reaction is not given. Is this a normal ozonolysis reaction in which the 1-2 Bond is...

Homework Statement Give the IUPAC nomenclature of the following compound (in the attachment) (sorry, i don't know why the picture has become upside down!) The Attempt at a Solution Shouldn't the answer be 1-phenyl-2,3-dibromopentane? The book says it is 2,3-dibromo-1-phenylpentane.

Hi everyone, I've recently had a little discussion at work concerning the concept of aromaticity applied to some molecules. To cut a long story short, while I see why 2-pyridone is considered aromatic: I don't understand why 1-methyl-2-pyridone is also considered aromatic: The two...

Homework Statement Homework Equations Huckel's Rule: 4n +2 pi electrons The Attempt at a Solution I'm having problems with the last molecule. I said that the first molecule was indeed aromatic because it has 6 pi electrons and obeys the 4n + 2 rule. The second one is not aromatic because...

I have two doubts in my course regarding resonance and aromaticity... (1) In various resonating structures, the hybridization of an atom may vary. Eg:- in aniline's nitrogen atom, it is sp3 as well as sp2 in different resonating structures. Since the actual molecule is a weighted mean of all...

I understand the rules of aromaticity, but I do not understand why Tropolone is aromatic. The main reason is because I thought all the atoms in the ring have to have p-orbitals. How does the C connected the oxygen with a double bond have a p-orbital? Have to do with the resonance (that's my main...