التفاصيل البيبلوغرافية
| العنوان: |
Organocatalysts for L-Lactide polymerization: 2-alkyl- and 2-aryl-1,1,3,3-tetramethylguanidines. |
| المؤلفون: |
Kamaraj, Rajiv1, Ganta, Prasanna Kumar1, Halima, Taoufik Ben2, Huang, Fei1, Penki, Venkata Sai Sashankh1, Tseng, Hsi-Ching3, Ding, Shangwu1,4, Chen, Hsuan-Ying1,4,5,6 hchen@kmu.edu.tw, Chen, Hsing-Yin1 |
| المصدر: |
Molecular Catalysis. Dec2024, Vol. 569, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*GUANIDINE, *POLYMERIZATION, *CATALYSTS, *CATALYTIC activity, *DENSITY functional theory |
| مستخلص: |
• A series of 2-alkyl- and 2-aryl-1,1,3,3-tetramethylguanidine derivatives were synthesized, and t their application in L -Lactide (LA) polymerization was studied. • Bn-TMG exhibited the highest catalytic activity compared to the mono 2-alkyl- and 2-aryl-1,1,3,3-tetramethylguanidine derivatives. • The catalytic activities of diguanidine derivatives exhibited higher catalytic activity than monoguanidine derivatives. • Bn-TMG is an organocatalyst for a controlled LA polymerization at 25 °C with excellent catalytic activity. A series of 2-alkyl- and 2-aryl-1,1,3,3-tetramethylguanidine derivatives were synthesized, and their application in L -Lactide (LA) polymerization was studied. Bn-TMG was the best catalyst in LA polymerization ([ Bn-TMG ] = 5 mM, conversion = 94 % after 4 h at 25 °C) compared to other monoguanidine derivatives. In addition, the catalytic activities of C2-dTMG exhibited higher catalytic activity than Bn-TMG , n Bu-TMG (monoguanidine derivatives), and C3-dTMG (diguanidine derivative). Density functional theory calculations revealed that Bn-TMG deprotonated benzyl alcohol enhanced benzyl alcohol's initiation ability to LA, and the protonated Bn-TMG activated LA ring-opening process by interacting with the ether oxygen atom of LA. Bn-TMG presented excellent catalytic activity and controllability for LA polymerization at 25 °C. [Display omitted] [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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