Thanks muchly...and funny, I saw that article and will reread it
K, I did a quick read on note 22....is the annulene they are talking about a compound with tetrahydrafuran? or should I have 3 signals in my NMR? If so, I cant see where?? and should my shielded protons have a (-) sign? We havent used negative values for NMR....?
Does temperature cause the molecule to rapildy interchange resonance structures? Causing its protons to be more deshielded? and how? and why wouldnt this effect be as strong on benzene-(why is benzene less?) does the lack of bridging in Annulene have anything to do with it?
thanks