16199-06-7Relevant academic research and scientific papers
Tetrakis-(N-pyrrolyl)methane: Structurally Important Member of the C(NR2)4 Family
Sun, Guanxing,Butler, Douglas N.,Warrener, Ronald N.,Margeti?, Davor
, p. 1195 - 1200 (2015)
The structural motif C(NR2)4 is rare in chemistry. The formation, NMR spectroscopic characteristics, and X-ray structure are reported for a structurally interesting member of this family, namely tetrakis-(N-pyrrolyl)methane.
Molecularly Defined Manganese Catalyst for Low-Temperature Hydrogenation of Carbon Monoxide to Methanol
Ryabchuk, Pavel,Stier, Kenta,Junge, Kathrin,Checinski, Marek P.,Beller, Matthias
supporting information, p. 16923 - 16929 (2019/10/28)
Methanol synthesis from syngas (CO/H2 mixtures) is one of the largest manmade chemical processes with annual production reaching 100 million tons. The current industrial method proceeds at high temperatures (200-300 °C) and pressures (50-100 atm) using a copper-zinc-based heterogeneous catalyst. In contrast, here, we report a molecularly defined manganese catalyst that allows for low-temperature/low-pressure (120-150 °C, 50 bar) carbon monoxide hydrogenation to methanol. This new approach was evaluated and optimized by quantum mechanical simulations virtual high-throughput screenings. Crucial for this achievement is the use of amine-based promoters, which capture carbon monoxide to give formamide intermediates, which then undergo manganese-catalyzed hydrogenolysis, regenerating the promoter. Following this conceptually new approach, high selectivity toward methanol and catalyst turnover numbers (up to 3170) was achieved. The proposed general catalytic cycle for methanol synthesis is supported by model studies and detailed spectroscopic investigations.
