Entity

Time filter

Source Type

Kaifeng, China

Henan University is a public university in Kaifeng, Henan, China. Wikipedia.


Wu T.-J.,Henan University
Chinese Journal of Applied Ecology | Year: 2013

Terrestrial ecosystem consists of aboveground and belowground components, whose interaction affects the ecosystem processes and functions. Soil fauna plays an important role in biogeochemical cycles. With the recognizing of the significance of soil fauna in ecosystem processes, increasing evidences demonstrated that global change has profound effects on soil fauna diversity. The alternation of land use type, the increasing temperature, and the changes in precipitation pattern can directly affect soil fauna diversity, while the increase of atmospheric CO2 concentration and nitrogen deposition can indirectly affect the soil fauna diversity by altering plant community composition, diversity, and nutrient contents. The interactions of different environmental factors can co-affect the soil fauna diversity. To understand the effects of different driving factors on soil fauna diversity under the background of climate change would facilitate us better predicting how the soil fauna diversity and related ecological processes changed in the future. Source


Han X.,National University of Singapore | Zhong F.,National University of Singapore | Wang Y.,Henan University | Lu Y.,National University of Singapore
Angewandte Chemie - International Edition | Year: 2012

A fast one: The title reaction proceeds in the presence of 5 mol % of the catalyst 1, and is complete within an hour. The 2-alkyl- and 2-aryl-substituted 3-pyrroline products are obtained in good yield and with high enantioselectivity. The application of the method to the concise formal synthesis of (+)-trachelanthamidine is also demonstrated. Boc=tert- butoxycarbonyl, M.S.=molecular sieves, TBDPS=tert-butyldiphenylsilyl. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Zhong F.,National University of Singapore | Han X.,National University of Singapore | Wang Y.,Henan University | Lu Y.,National University of Singapore
Angewandte Chemie - International Edition | Year: 2011

Spiral bound: The Morita-Baylis-Hillman adducts were employed as C 3 synthons in the asymmetric [3+2] annulation with malonitrile substrates using L-threonine-derived 1 as the catalyst (see scheme). The reaction is highly regioselective and stereoselective, and affords optically enriched 3-spirocyclopentene-2-oxindoles containing two contiguous quaternary centers. Boc=tert-butoxycarbonyl, PMB=para-methoxybenzyl, TIPS= triisopropylsilyl. © 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Zhong F.,National University of Singapore | Han X.,National University of Singapore | Wang Y.,Henan University | Lu Y.,National University of Singapore
Chemical Science | Year: 2012

Highly enantioselective [4 + 2] annulation of activated alkenes with α-substituted allenoates catalyzed by amino acid-based bifunctional phosphines has been developed for the first time, which provides an easy access to optically enriched functionalized cyclohexenes. In particular, 3-spirocyclohexene-2-oxindoles were prepared in high yields and with excellent enantioselectivities. This journal is © 2012 The Royal Society of Chemistry. Source


Han X.,National University of Singapore | Wang Y.,Henan University | Zhong F.,National University of Singapore | Lu Y.,National University of Singapore
Journal of the American Chemical Society | Year: 2011

A new family of dipeptide-based chiral phosphines was designed and prepared. d-Thr-l-tert-Leu-derived catalyst 4c promoted [3 + 2] cycloaddition of allenoates to α-substituted acrylates in a regiospecific and stereoselective manner, furnishing functionalized cyclopentenes with quaternary stereogenic centers in high yields and with excellent enantioselectivities. © 2011 American Chemical Society. Source

Discover hidden collaborations