The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Picolinamide( cas:1452-77-3 ) is researched.Product Details of 1452-77-3.Gu, Yu; Matsuda, Keitaro; Nakayama, Akira; Tamura, Masazumi; Nakagawa, Yoshinao; Tomishige, Keiichi published the article 《Direct Synthesis of Alternating Polycarbonates from CO2 and Diols by Using a Catalyst System of CeO2 and 2-Furonitrile》 about this compound( cas:1452-77-3 ) in ACS Sustainable Chemistry & Engineering. Keywords: carbon dioxide diol copolymerization cerium oxide catalyst furonitrile. Let’s learn more about this compound (cas:1452-77-3).
The control technique of polymer mol. weight is required for the synthesis of versatile polymers with various properties. In our previous work, we found that CeO2 + 2-cyanopyridine catalyst system was effective for the direct synthesis of alternating polycarbonates from CO2 and diols, however, the maximum average mol. weight was ∼1000 g mol-1 (d.p. = 7-8). In this study, we succeeded in the synthesis of alternating polycarbonates with higher mol. weight from CO2 and diols by using a catalyst system of CeO2 + 2-furonitrile. The average mol. weight reached up to 5000 g mol-1 and could be controlled by adjusting the amount of diols and 2-furonitrile. Moreover, polycarbonate diols, polycarbonates without capping of OH groups at the ends, were obtained with the average mol. weight of ∼2000 g mol-1. The catalyst system was applicable to the direct polymerization of CO2 and various α,ω-diols, providing the corresponding alternating polymers. Comparison of CeO2 + 2-cyanopyridine and CeO2 + 2-furonitrile catalyst systems based on the kinetics and DFT calculations showed two main causes for the formation of polycarbonates with higher mol. weight in the CeO2 + 2-furonitrile catalyst system: First, the reactivity of 2-furamide, which was formed from 2-furonitrile, with produced polycarbonate diols was lower than that of 2-picolinamide, which was formed from 2-cyanopyridine, leading to decrease of formation of ester-capped polycarbonates. Second, the adsorption of 2-furonitrile on CeO2 was weaker than that of 2-cyanopyridine, leading to low steric hindrance at the active sites of CeO2 and enabling the reaction of longer diols, such as polycarbonate diols with CO2.
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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem