The purpose of this experiment is to compare and observe the effect of chain length which corresponds to the number of methylene group units on the effectiveness of the catalyst in the reaction of benzaldehyde with malononitrile.
In the design of this reactive diluent, titanium was chosen as the central transition metal atom for its high electronegativity, which increases the reactivity of the allylic methylene groups, and its tetravalent character, which enables an increase in the number of reactive sites without excessive increase in the viscosity of the formulation.
Most recent work suggests that copper ions can complex with the amide group in nylon, and may also complex with hydroperoxides formed on the N-vicinal methylene group, assisting with their breakdown to non-radical, harmless, species.
The formation of 17 is believed to be formed via addition of methylene group of 13a on the double bond system of enaminone 2 to afford the unstable intermediate 14a which loses readily dimethylamine to afford the non- isolable intermediate 15a which tautomerises into 16a that loses water to afford 17.
In order to determine the sequence distribution of side groups, the intensity of the aromatic proton in the cinnamyloxide group was first estimated from both the intensity of the methylene group and the ratio of the numbers of hydrogen at the methylene to phenyl group.