何良年教授课题组

元素有机化学国家重点实验室

南开大学

何良年教授课题组

论文发表

Year: 2021; 2020; 2019; 2018; 2017; 2016; 2015; 2014; 2013; 2012; 2011; 2010; 2009; 2008; 2007; 2006; 2005; more

 

2021

 

1.  Mei-Yan Wang, Xin Jin, Xiaofei Wang, Shumei Xia, Yue Wang, Shouying Huang, Ying Li, Liang-Nian He*, Xinbin Ma*, Copper‐Catalyzed and Proton‐Directed Selective Hydroxymethylation of Alkynes with CO2, Angew. Chem. Int. Ed., 2021, 10.1002/anie.202012768. [link]

Abstract: An intriguing strategy for copper‐catalyzed hydroxymethylation of alkynes with CO2 and hydrosilane was developed. Switched on/off a proton source, e.g. tBuOH, direct hydroxymethylation and reductive hydroxymethylation could be triggered selectively, delivering a series of allylic alcohols and homobenzylic alcohols respectively, with high levels of Z/E, regio‐ and enantioselectivity. Such a selective synthesis is attributed to the differences in response of vinylcopper intermediate to proton and CO2 . The protonation of vinylcopper species is demonstrated to be prior to hydroxymethylation, thus allowing a diversion from direct alkyne hydroxymethylation to reductive hydroxymethylation in the presence of suitable proton.

 

2.   Xiao Zhang, Hong-Ru Li, Feng-Ge Zhao, Xiao-Ying Cui, Feng Ye, Liang-Nian He*, Green Process for Hydrogenation of Methyl Ricinoleate to Methyl 12-Hydroxystearate Over Diatomite Supported Cu-Ni Bimetallic Catalyst, Green Chemical Engineering, 2021, DOI: 10.1016/j.gce.2020.09.011. [link]

Abstract: A series of diatomite supported Cu–Ni bimetallic catalysts were prepared using the co-impregnation method to improve the efficiency and selectivity toward methyl 12-hydroxystearate in the hydrogenation of methyl ricinoleate. The catalysts were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (H2-TPR). All the characterization results verified the formation of highly dispersed Ni–Cu alloy on support. Moreover, by subtly regulating the Ni/Cu molar ratio as well as the reaction parameters, the hydrogenation of methyl ricinoleate to methyl 12-hydroxystearate proceeded efficiently and selectively, affording 97% yield of methyl 12-hydroxystearate and nearly equivalent conversion of methyl ricinoleate under 2 MPa H2 pressure and at 130 °C in 4 h with only 1 wt% of the catalyst Ni7Cu1/diatomite (based on methyl ricinoleate). Besides, the supported Cu–Ni bimetallic catalyst is stable during recycle and reuse. After five cycles of reuse, much catalytic activity is still preserved. Therefore, this low-cost and stable bimetallic catalyst would be promising for the hydrogenation of methyl ricinoleate to methyl 12-hydroxystearate, representing an example of green catalysis for efficiently conversion of biomass to value-added chemicals and materials.

 

 

 

 

 

 

 

 

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