Friedal crafts acylation and alkylation Flashcards
(8 cards)
Why is C6H5CN a deactivating group
it is sp hybridized therefore no lone pair
Why do activating groups attatched to benzene make the reaction foster
because they make the electron density go towards the benzene which makes the electophillic substituition reaction faster
Why is C6H5OH faster in nitration than C6H5CHO
Because OH group is more electron releasing as it has a lone pair which makes the electron density move towards the benzene more when compared to Cho which is an aldehyde
Why is freidal crafts acylation reaction used for preparation of C6H5C3H7
because there are no extra products due to rearrangement
Why in Friedal crafts acylation , polyalkylation does not take place .
because in F&C acylation reaction the product is less reactive as in acylation , coch3 etc is used which is a deactivating group which makes benzene less reactive , therefore it does not undergo polyalkylation
how is the C=O broken in acylation reaction?
using Clemmensen’s reduction(Zn-Hg/hcl) or wolf kishner’s reduction(N2H4/KOH) we get rid of the C=O to get the desired product which is 100% as we did not have polyacylation
number of resonating structures of : naphthalene,anthracene and phenanthalene
3,4,5
naphthalene has two structural isomers with E as substitution
, the first one is in the first carbon atom and the second one is at the second carbon atom , Which one is more stable?
The one in the first carbon atom is more stable ( it is not a bulky functional group) as it has more resonating structures which are benzene like , this also makes the activation energy less for it.
