|6. The article (See Table 1) shows that highest yields of products are obtained with amines such as triethylamine (ET3N) and diisopropylethylamine (Pr,NEt). However,practically no product is obtained when amines such as aniline and benzylamine(PHCH2NH2) are used. Provide an explanation as to why this may be so. Talk about aniline and benzylamine separately. What are structural differences between the bases in terms of the number, and type of substituents? Think about what property of the amine, specifically the lone pair, is affected as a result of this?)

Fig: 1