Development and design of [OSSO]-type catalysts for precise polymerization of versatile alfa-olefins

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410035
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Organic chemistry
• Research Institution: Saitama University
• Principal Investigator: Nakata Norio 埼玉大学, 理工学研究科, 助教 (50375416)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ポストメタロセン / α－オレフィン / 立体特異的重合反応 / ジルコニウム / ハフニウム / 硫黄 / [OSSO]型配位子

Outline of Final Research Achievements

In order to realize precise polymerization of versatile alfa-olefins such as propylene and styrene, novel [OSSO]-type bis(phenolate) ligands based on a trans-1,2-cyclooctanediyl platform and their zircoium complexes were developed. As a result, upon activation with dMAO (dried methylaluminoxane), the complex 4 was found to promote highly isospecific styrene polymerizations ([mm] = 97.5-99%) with high molecular weights up to 181,000 g mmol-1. When the Dmp-substituted pre-catalyst 5/dMAO system was used, the highest activity over 7,700 g mmol(5)-1 h-1 was recorded involving the formation of precisely isospecific polystyrenes of [mm] more than 99%.

Free Research Field

有機金属化学