Tetracoordinate aluminum complexes bearing phenoxy-based ligands as catalysts for epoxide/anhydride copolymerization: some mechanistic insights

2019 ◽  
Vol 9 (12) ◽  
pp. 3090-3098 ◽  
Author(s):  
Florence Isnard ◽  
Federica Santulli ◽  
Mariachiara Cozzolino ◽  
Marina Lamberti ◽  
Claudio Pellecchia ◽  
...  
Keyword(s):  
Initiation Step ◽  
Aluminum Complexes ◽  
Alternating Copolymerization

Phenoxy-imine aluminum complexes, in combination with DMAP, produce efficient catalysts for the alternating copolymerization of epoxides and anhydrides. A zwitterionic species is formed in the initiation step.

scholarly journals Alternating Copolymerization of Epoxides and Anhydrides Catalyzed by Aluminum Complexes

ACS Omega ◽  
2018 ◽  
Vol 3 (12) ◽  
pp. 17581-17589 ◽  
Author(s):  
Marc Martínez de Sarasa Buchaca ◽  
Felipe de la Cruz-Martínez ◽  
Javier Martínez ◽  
Carlos Alonso-Moreno ◽  
Juan Fernández-Baeza ◽  
...  
Keyword(s):  
Aluminum Complexes ◽  
Alternating Copolymerization

Detecting Critical Crevice Temperature for Duplex Stainless Steels in Chloride Solutions

CORROSION ◽  
2011 ◽  
Vol 67 (2) ◽  
pp. 025004-1-025004-7 ◽  
Author(s):  
D. Han ◽  
Y. Jiang ◽  
B. Deng ◽  
L. Zhang ◽  
J. Gao ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Crevice Corrosion ◽  
Electrochemical Method ◽  
Duplex Stainless Steels ◽  
Good Reproducibility ◽  
X Ray ◽  
Initiation Step ◽  
Critical Pitting Temperature ◽  
Preferential Dissolution ◽  
Scanning Electron

Abstract A simple and rapid electrochemical method for the evaluation of crevice corrosion in duplex stainless steels (DSS) is described. Three types of DSS—namely, UNS S32101, UNS S31803, and UNS S32750—were tested in 1 mol/L sodium chloride (NaCl) solutions. Results showed good reproducibility with a typical standard deviation of below 3°C. The critical pitting temperature (CPT) for the same specimens was also investigated in 1 mol/L NaCl solutions. An approximately 20°C decrease from CPT to critical crevice temperature (CCT) was observed and subsequently explained. Then, the morphologies of crevice corrosion were studied using scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDS) method. The SEM/EDS study revealed that the ferrite phase was the site where preferential dissolution took place at the initiation step of crevice corrosion, which was in accordance with the prediction by calculating the critical crevice index. Moreover, repassivation was detected with the development of crevice corrosion. The reason was clarified by combining the results obtained with a successful diffusion model, and eventually the crevice corrosion progress was illustrated schematically.

Chiral salenCo(iii) complexes with bulky substituents as catalysts for stereoselective alternating copolymerization of racemic propylene oxide with carbon dioxide and succinic anhydride

2021 ◽  
Vol 12 (12) ◽  
pp. 1776-1786
Author(s):  
Zhou Wang ◽  
Ying Mu
Keyword(s):  
Carbon Dioxide ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Succinic Anhydride ◽  
Poly Propylene ◽  
Alternating Copolymerization

Stereoregular poly(propylene carbonate)s and poly(propylene succinate-block-carbonate)s were synthesized with new chiral salenCo(iii) catalysts carrying bulky substituents.

scholarly journals Relevance of Translation Initiation in Diffuse Glioma Biology and its Therapeutic Potential

Cells ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1542 ◽  
Author(s):  
Digregorio Marina ◽  
Lombard Arnaud ◽  
Lumapat Paul Noel ◽  
Scholtes Felix ◽  
Rogister Bernard ◽  
...  
Keyword(s):  
Translation Initiation ◽  
Protein Production ◽  
Therapeutic Potential ◽  
Environmental Stressors ◽  
Current Therapy ◽  
Diffuse Glioma ◽  
Overall Survival Rate ◽  
Malignant Cells ◽  
Translational Machinery ◽  
Initiation Step

Cancer cells are continually exposed to environmental stressors forcing them to adapt their protein production to survive. The translational machinery can be recruited by malignant cells to synthesize proteins required to promote their survival, even in times of high physiological and pathological stress. This phenomenon has been described in several cancers including in gliomas. Abnormal regulation of translation has encouraged the development of new therapeutics targeting the protein synthesis pathway. This approach could be meaningful for glioma given the fact that the median survival following diagnosis of the highest grade of glioma remains short despite current therapy. The identification of new targets for the development of novel therapeutics is therefore needed in order to improve this devastating overall survival rate. This review discusses current literature on translation in gliomas with a focus on the initiation step covering both the cap-dependent and cap-independent modes of initiation. The different translation initiation protagonists will be described in normal conditions and then in gliomas. In addition, their gene expression in gliomas will systematically be examined using two freely available datasets. Finally, we will discuss different pathways regulating translation initiation and current drugs targeting the translational machinery and their potential for the treatment of gliomas.

Reactivity of Aluminum Complexes of Redox-Active Ligand toward N-Heterocyclic Carbene and Its Thione

2019 ◽  
Vol 39 (1) ◽  
pp. 66-73 ◽  
Author(s):  
Vladimir G. Sokolov ◽  
Tatyana S. Koptseva ◽  
Roman V. Rumyantcev ◽  
Xiao-Juan Yang ◽  
Yanxia Zhao ◽  
...  
Keyword(s):  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Aluminum Complexes
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