(couleur) grey (Grande-Bretagne) , gray (USA) il fait gris it's a dull day, it's a grey day. faire grise mine to look morose. faire grise mine Ã  qn to give sb a cool reception.
In electrophilic aromatic substitution, the benzene ring acts as an electron donor (Lewis base or nucleophile) and reacts with an electron acceptor (Lewis acid or electrophile). The result of electrophilic aromatic substitution reactions is that an aromatic hydrogen is replaced by some other atom or functional group.
A nucleophile is something which is attracted to, and then attacks, a positive or slightly positive part of another molecule or ion. All amines contain an active lone pair of electrons on the very electronegative nitrogen atom. It is these electrons which are attracted to positive parts of other molecules or ions.The reactions of primary amines with halogenoalkanes. You get a complicated series of reactions on heating to give a mixture of products-probably one of the most confusing sets of reactions you will meet at this level.t is these electrons which are attracted to positive parts of other molecules or ions. The reactions of primary amines with halogenoalkanes. You get a complicated series of reactions on heating to give a mixture of products-probably one of the most confusing sets of reactions you will meet at this level.