Search results for: Peter Zhang

Items from 1 to 20 out of 104 results

article

Metalloradical Catalysis: General Approach for Controlling Reactivity and Selectivity of Homolytic Radical Reactions

Wan‐Chen Cindy Lee, X. Peter Zhang

Angewandte Chemie International Edition > 63 > 20 > n/a - n/a

Since Friedrich Wöhler's groundbreaking synthesis of urea in 1828, organic synthesis over the past two centuries has predominantly relied on the exploration and utilization of chemical reactions rooted in two‐electron heterolytic ionic chemistry. While one‐electron homolytic radical chemistry is both rich in fundamental reactivities and attractive with practical advantages, the synthetic application...

article

Metalloradical Catalysis: General Approach for Controlling Reactivity and Selectivity of Homolytic Radical Reactions

Wan‐Chen Cindy Lee, X. Peter Zhang

Angewandte Chemie > 136 > 20 > n/a - n/a

article

Functional Porphyrinic Metal–Organic Framework as a New Class of Heterogeneous Halogen‐Bond‐Donor Catalyst

Weijie Zhang, Ayman Nafady, Chuan Shan, Lukasz Wojtas, more

Angewandte Chemie International Edition > 60 > 45 > 24312 - 24317

Biomimetic metal‐organic frameworks have attracted great attention as they can be used as bio‐inspired models, allowing us to gain important insights into how large biological molecules function as catalysts. In this work, we report the synthesis and utilization of such a metal‐metalloporphyrin framework (MMPF) that is constructed from a custom‐designed ligand as an efficient halogen bond donor catalyst...

article

Functional Porphyrinic Metal–Organic Framework as a New Class of Heterogeneous Halogen‐Bond‐Donor Catalyst

Weijie Zhang, Ayman Nafady, Chuan Shan, Lukasz Wojtas, more

Angewandte Chemie > 133 > 45 > 24514 - 24519

article

Sampling and Analysis in Flow: The Keys to Smarter, More Controllable, and Sustainable Fine‐Chemical Manufacturing

Mathieu A. Morin, Wenyao (Peter) Zhang, Debasis Mallik, Michael G. Organ

Angewandte Chemie International Edition > 60 > 38 > 20606 - 20626

Process analytical technology (PAT) is a system designed to help chemists better understand and control manufacturing processes. PAT systems operate through the combination of analytical devices, reactor control elements, and mathematical models to ensure the quality of the final product through a quality by design (QbD) approach. The expansion of continuous manufacturing in the pharmaceutical and...

article

Sampling and Analysis in Flow: The Keys to Smarter, More Controllable, and Sustainable Fine‐Chemical Manufacturing

Mathieu A. Morin, Wenyao (Peter) Zhang, Debasis Mallik, Michael G. Organ

Angewandte Chemie > 133 > 38 > 20774 - 20794

article

The Synthesis of Warfarin Using a Reconfigurable‐Reactor Platform Integrated to a Multiple‐Variable Optimization Tool

Jee Seong Kwak, Nour Bizarri, Sepideh Sharif, Wenyao Peter Zhang, more

Chemistry – A European Journal > 26 > 67 > 15505 - 15508

Optimization of the asymmetric synthesis of warfarin, an important anticoagulant, has been evaluated using a reconfigurable reaction platform capable of performing batch, continuous flow, and plug‐flow synthesis. Further, this platform has been integrated with a novel, multidimensional, multiple variable analysis tool that can evaluate multiple critical quality attributes (CQA), percent conversion...

article

Polyphenols from Stevia rebaudiana (Bertoni) leaves and their functional properties

Khaing zar Myint, Ke Wu, Yongmei Xia, Ye Fan, more

Journal of Food Science > 85 > 2 > 240 - 248

The major polyphenol components from Stevia rebaudiana (Bertoni) leaves (PPS) are chlorogenic acids, a polyphenol family of esters, including hydroxycinnamic acids with quinic acid, which possesses excellent hydrophilic antioxidant activity and other therapeutic properties. As an abundant byproduct during production of steviol glycosides, the PPS would be a new antioxidantive food resource or additives...

article

Next‐Generation D₂‐Symmetric Chiral Porphyrins for Cobalt(II)‐Based Metalloradical Catalysis: Catalyst Engineering by Distal Bridging

Yang Hu, Kai Lang, Jingran Tao, McKenzie K. Marshall, more

Angewandte Chemie International Edition > 58 > 9 > 2670 - 2674

Novel D₂‐symmetric chiral amidoporphyrins with alkyl bridges across two chiral amide units on both sides of the porphyrin plane (designated “HuPhyrin”) have been effectively constructed in a modular fashion to permit variation of the bridge length. The Co^II complexes of HuPhyrin, [Co(HuPhyrin)], represent new‐generation metalloradical catalysts where the metal‐centered d‐radical is situated inside...

article

Next‐Generation D₂‐Symmetric Chiral Porphyrins for Cobalt(II)‐Based Metalloradical Catalysis: Catalyst Engineering by Distal Bridging

Yang Hu, Kai Lang, Jingran Tao, McKenzie K. Marshall, more

Angewandte Chemie > 131 > 9 > 2696 - 2700

article

Catalytic Radical Process for Enantioselective Amination of C(sp³)−H Bonds

Chaoqun Li, Kai Lang, Hongjian Lu, Yang Hu, more

Angewandte Chemie > 130 > 51 > 17079 - 17083

A new catalytic radical system involving Co^II‐based metalloradical catalysis is effective in activating sulfamoyl azides for enantioselective radical 1,6‐amination of C(sp³)−H bonds, affording six‐membered chiral heterocyclic sulfamides in high yields with excellent enantioselectivities. The Co^II‐catalyzed C−H amination features an unusual degree of functional‐group tolerance and chemoselectivity...

article

Catalytic Radical Process for Enantioselective Amination of C(sp³)−H Bonds

Chaoqun Li, Kai Lang, Hongjian Lu, Yang Hu, more

Angewandte Chemie International Edition > 57 > 51 > 16837 - 16841

article

Tu1672 - Heat Shock Protein 47 Promotes Tumor Progression and Chemoresistance by Modulating Akt Signaling in Colorectal Cancer

Yi-Jye Chern, Peter Zhang, Isabella T. Tai

Gastroenterology > 2018 > 154 > 6(S1) > S-989-S-990

article

A case study in identifying targeted patients population in major depressive disorder by enhanced enrichment design

Peter Zhang, Kevin Carroll, Mary Hobart, Carole Augustine, more

Pharmaceutical Statistics > 17 > 2 > 144 - 154

Despite advances in clinical trial design, failure rates near 80% in phase 2 and 50% in phase 3 have recently been reported. The challenges to successful drug development are particularly acute in central nervous system trials such as for pain, schizophrenia, mania, and depression because high‐placebo response rates lessen assay sensitivity, diminish estimated treatment effect sizes, and thereby decrease...

article

Collaborative planning, forecasting, and replenishment & firm performance: An empirical evaluation

Craig A. Hill, G. Peter Zhang, Keith E. Miller

International Journal of Production Economics > 2018 > 196 > C > 12-23

The Collaborative Planning, Forecasting, and Replenishment (CPFR) initiative is an increasingly popular paradigm that helps the supply chain better coordinate activities to serve customers with improved demand forecasting and production scheduling. CPFR provides a framework that covers a broad range of issues including demand forecasting, inventory management, production and replenishment planning,...

article

Correction to: Relatively frequent switching of transcription start sites during cerebellar development

Peter Zhang, Emmanuel Dimont, Thomas Ha, Douglas J. Swanson, more

BMC Genomics > 2018 > 19 > 1 > 1-2

Correction The authors of the original article [1] would like to recognize the critical contribution of core members of the FANTOM5 Consortium, who played the critical role of HeliScopeCAGE sequencing experiments, quality control of tag reads and processing of the raw sequencing data.

article

Geotechnical considerations for concurrent pillar recovery in close-distance multiple seams

Peter Zhang, Berk Tulu, Morgan Sears, Jack Trackemas

International Journal of Mining Science and Technology > 2018 > 28 > 1 > 21-27

Room-and-pillar mining with pillar recovery has historically been associated with more than 25% of all ground fall fatalities in underground coal mines in the United States. The risk of ground falls during pillar recovery increases in multiple-seam mining conditions. The hazards associated with pillar recovery in multiple-seam mining include roof cutters, roof falls, rib rolls, coal outbursts, and...

article

The Impact of Product Returns and Retailer's Service Investment on Manufacturer's Channel Strategies*

Yusen Xia, Tiaojun Xiao, G. Peter Zhang

Decision Sciences > 48 > 5 > 918 - 955

We study the distribution channel decision of a manufacturer who considers whether to add an online channel (direct channel) to its brick‐and‐mortar retailer (indirect channel). The retailer faces the opportunity to invest in store assistance to help consumers choose products and thus reduce product returns. Special attention is given to the impact of product returns and retailer's store assistance...

article

Relatively frequent switching of transcription start sites during cerebellar development

Peter Zhang, Emmanuel Dimont, Thomas Ha, Douglas J. Swanson, more

BMC Genomics > 2017 > 18 > 1 > 1-14

Background Alternative transcription start site (TSS) usage plays important roles in transcriptional control of mammalian gene expression. The growing interest in alternative TSSs and their role in genome diversification spawned many single-gene studies on differential usages of tissue-specific or temporal-specific alternative TSSs. However, exploration of the switching usage of alternative TSS usage...

article

Intramolecular Radical Aziridination of Allylic Sulfamoyl Azides by Cobalt(II)‐Based Metalloradical Catalysis: Effective Construction of Strained Heterobicyclic Structures

Huiling Jiang, Kai Lang, Hongjian Lu, Lukasz Wojtas, more

Angewandte Chemie > 128 > 38 > 11776 - 11780

Cobalt(II)‐based metalloradical catalysis (MRC) has been successfully applied for effective construction of the highly strained 2‐sulfonyl‐1,3‐diazabicyclo[3.1.0]hexane structures in high yields through intramolecular radical aziridination of allylic sulfamoyl azides. The resulting [3.1.0] bicyclic aziridines prove to be versatile synthons for the preparation of a diverse range of 1,2‐ and 1,3‐diamine...

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INFONA - science communication portal

Search results for: Peter Zhang

Metalloradical Catalysis: General Approach for Controlling Reactivity and Selectivity of Homolytic Radical Reactions

Metalloradical Catalysis: General Approach for Controlling Reactivity and Selectivity of Homolytic Radical Reactions

Functional Porphyrinic Metal–Organic Framework as a New Class of Heterogeneous Halogen‐Bond‐Donor Catalyst

Functional Porphyrinic Metal–Organic Framework as a New Class of Heterogeneous Halogen‐Bond‐Donor Catalyst

Sampling and Analysis in Flow: The Keys to Smarter, More Controllable, and Sustainable Fine‐Chemical Manufacturing

Sampling and Analysis in Flow: The Keys to Smarter, More Controllable, and Sustainable Fine‐Chemical Manufacturing

The Synthesis of Warfarin Using a Reconfigurable‐Reactor Platform Integrated to a Multiple‐Variable Optimization Tool

Polyphenols from Stevia rebaudiana (Bertoni) leaves and their functional properties

Next‐Generation D₂‐Symmetric Chiral Porphyrins for Cobalt(II)‐Based Metalloradical Catalysis: Catalyst Engineering by Distal Bridging

Next‐Generation D₂‐Symmetric Chiral Porphyrins for Cobalt(II)‐Based Metalloradical Catalysis: Catalyst Engineering by Distal Bridging

Catalytic Radical Process for Enantioselective Amination of C(sp³)−H Bonds

Catalytic Radical Process for Enantioselective Amination of C(sp³)−H Bonds

Tu1672 - Heat Shock Protein 47 Promotes Tumor Progression and Chemoresistance by Modulating Akt Signaling in Colorectal Cancer

A case study in identifying targeted patients population in major depressive disorder by enhanced enrichment design

Collaborative planning, forecasting, and replenishment & firm performance: An empirical evaluation

Correction to: Relatively frequent switching of transcription start sites during cerebellar development

Geotechnical considerations for concurrent pillar recovery in close-distance multiple seams

The Impact of Product Returns and Retailer's Service Investment on Manufacturer's Channel Strategies*

Relatively frequent switching of transcription start sites during cerebellar development

Intramolecular Radical Aziridination of Allylic Sulfamoyl Azides by Cobalt(II)‐Based Metalloradical Catalysis: Effective Construction of Strained Heterobicyclic Structures

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