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|
| Type |
Poster Presentation |
| Area |
Polymer Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
POLY.P-44 |
| Subject |
β–selective cyclopolymerization using Ru-based dithiolate catalyst by controlled manner |
| Authors |
Kijung Jung, Tae-Lim Choi*
Division of Chemistry, Seoul National University, Korea
|
| Abstract |
Ru-based Grubbs catalysts employed in cyclopolymerization (CP) of diyne deivatives have promoted selective α–addition, forming the conjugated polyenes containing exclusively five-membered repeat unit in the case of 1,6-heptadiynes. Along with our recent achievement on β–selective CP using a Ru-based Z-selective olefin metathesis catalyst, we have pursued a higher efficiency and more selective regiocontrol to produce conjugated polymers with only six-membered rings with broader substrate scope. Herein, we demonstrate a very β–selective CP by applying another type of Ru-based dithiolate catalyst, and discovering the prominent effects of pyridine additives to improve the conversion and the selectivity. In-depth observation and monitoring on the reactive carbene species enabled us to understand the plausible role of pyridine ligands, such as stabilizing the propagating carbenes and control ki/kp values. All of the investigation led the living/controlled CP and further diblock copolymerization to be possible, which became the first example for CP in a completely β–selective and living manner using Ru-based catalysts. |
| E-mail |
kjjung@snu.ac.kr |
|
121st General Meeting of the KCS