We introduce a mild and efficient avenue to induce the folding of single chain polymer nanoparticles (SCNPs) using visible light. The versatility of the method is based on three folding mechanisms exploiting tetrazole chemistry, i.e., nitrile imine-mediated tetrazole-ene cycloaddition (NITEC), nitrile imine carboxylic acid ligation (NICAL) as well as nitrile imine self-dimerization. To our knowledge, this visible light driven approach is the to-date mildest avenue to fold single polymer chains into compact particles using light.
We demonstrate how a normally base‐induced or transition‐metal‐catalyzed cycloaddition reaction can be executed without additives by equipping the reactant with a chromophore as a light‐harvesting unit, able to exploit light to boost the reaction. Specifically, we generate a highly reactive nitrile oxide upon light irradiation which is able to undergo cycloaddition reactions with a wide range of substrates by introducing a pyrene unit into the oxime precursor. Commercially available LED setups, and even ambient light, were successfully employed to induce the cycloaddition. Our approach demonstrates that the careful design of light‐harvesting chromophores can be a powerful tool to facilitate light‐induced chemical transformations.
<div class="section abstract"><div class="htmlview paragraph">With the announcement of the Euro 7 proposal, it is now clear that nitrous oxide
(laughing gas, N<sub>2</sub>O) emissions must be considered and complied with
the certification of exhaust aftertreatment systems (EATS) of commercial
vehicles (CV). This paper describes the possible formation pathways for
N<sub>2</sub>O in the EATS for different drives and uses measurement results
to show the boundary condition and the magnitude of formation as well as the
possibilities for influencing or preventing its formation.</div></div>
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