Selective formation of polycarbonate over cyclic carbonate: Copolymerization of epoxides with carbon dioxide catalyzed by a cobalt(III) complex with a piperidinium end-capping arm
Selective formation of polycarbonate over cyclic carbonate: Copolymerization of epoxides with carbon dioxide catalyzed by a cobalt(III) complex with a piperidinium end-capping arm
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DOI:
10.1002/anie.200603132
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发表时间:
2006-01-01
影响因子:
16.6
通讯作者:
Nozaki, Kyoko
中科院分区:
文献类型:
--
作者:
Nakano, Koji;Kamada, Toshihiro;Nozaki, Kyoko
1 Me– 3 38 99: 1 12600 1.13 2 Me– 12 77 99: 1 23900 1.14 3 Me– 116 79 96: 4 83700 1.28 4 Me– 1 34 90: 10 7100 1.22 5 Me DME 6 53 99: 1 13200 1.10 6 Me DME 48> 99 97: 3 26 500 1.10 7 [d] Me DME 20 95 95: 5 5100 1.06 8 Et DME 48 89 97: 3 31 000 1.12 9 Bu DME 48 89 98: 2 34300 1.14 [a] Reaction conditions: epoxide (14.3 mmol in entries 1, 2, and 4–9; 47.2 mmol in entry 3), 1 (epoxide/1= 2000 in entries 1, 2, and 4; 6500 in entry3; 1000 in entries5–9), CO2 (initial pressure: 1.4 MPa), DME (1.0 mL in entries 5–9), at 258C (entries 1–3 and 5–9) or 608C (entry 4).[b] Determined on the basis of 1HNMR spectroscopy of the crude product by using phenanthrene as an internal standard.[c] Determined by size-exclusion chromatography analysis using a polystyrene standard.[d] Methanol (20 equivalents based on 1) was added.