Beilstein J. Org. Chem.2021,17, 105–114, doi:10.3762/bjoc.17.11
acid (GCP) or the aminopyridine carbonyl pyrrole carboxylic acid (ACP). At low temperatures, small cyclic structures are formed. However, at elevated temperatures, a ring–chaintransformation leads to the formation of a supramolecular polymer. We demonstrate that this effect is dependent on the
identification of one compound as a promising VII.
Keywords: noncovalent interactions; polymers; ring-chaintransformation; supramolecular chemistry; viscosity; Introduction
Viscosity index improvers (VIIs) are used to counteract the loss of viscosity of working fluids (such as motor oils) at elevated
transformation at elevated temperatures, leading to the desired viscosity effect. The direct comparison of the linkers in A and B strongly suggests that the Thorpe–Ingold effect induced by the gem-dimethyl unit is crucial for the supramolecular polymerization, thus indicating that indeed a ring–chain
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Graphical Abstract
Figure 1:
a) VII systems described by Sijbesma and Meijer, featuring two ureidopyrimidone BUs which are linke...