scholarly journals Allylic Alcohol Synthesis by Ni-Catalyzed Direct and Selective Coupling of Alkynes and Methanol

2021 ◽  
Author(s):  
Herong chen ◽  
Zhijun Zhou ◽  
Wangqing Kong
Keyword(s):  
Coupling Reaction ◽  
Allylic Alcohol ◽  
Raw Material ◽  
Alcohol Synthesis

Methanol is an abundant and renewable chemical raw material, but its use as a C1 source in C-C bond coupling reaction still constitutes a big challenge, and the known methods...

Intra-molecular nitrone–olefin cycloaddition of d-glucose derived allylic alcohol: synthesis of new aminocyclohexitols

Tetrahedron ◽  
2007 ◽  
Vol 63 (48) ◽  
pp. 11984-11990 ◽  
Author(s):  
Chaitali Chakraborty ◽  
Vinod P. Vyavahare ◽  
Dilip D. Dhavale
Keyword(s):  
Allylic Alcohol ◽  
Alcohol Synthesis

scholarly journals A dimeric stilbene extract produced by oxidative coupling of resveratrol active against Plasmopara viticola and Botrytis cinerea for vine treatments

OENO One ◽  
2020 ◽  
Vol 54 (1) ◽  
pp. 157-164 ◽  
Author(s):  
Toni El Khawand ◽  
Julien Gabaston ◽  
David Taillis ◽  
Marie-Laure Iglesias ◽  
Eric Pedrot ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Defense Mechanisms ◽  
Bordeaux Mixture ◽  
Coupling Reaction ◽  
Plasmopara Viticola ◽  
Raw Material ◽  
Antimicrobial Compounds ◽  
Oxidative Coupling Reaction ◽  
Pure Compounds

Aim: Stilbenes are a group of polyphenols that contribute to the defense mechanisms of grapevine under stress conditions. The main active compounds are oligomeric stilbenes. The sourcing of such compounds is limited by plant raw material availability. In order to overcome this limitation, we proceeded to hemisynthesis of oligomeric stilbenes from natural resveratrol by oxidative coupling using metals. The reaction mixture and the obtained pure compounds were tested for their antimicrobial activity in vitro against P. viticola and B. cinerea, and compared with that of resveratrol and grapevine cane extract.Methods and results: Hemisynthesis was achieved in methanol using silver acetate (AgOAc) as oxidative coupling reagent. Four main compounds were obtained in the reaction mixture: δ-viniferin, parthenostilbenin B, oxistilbenins A and B. Results demonstrate the ability of oxidative coupling reaction to produce potent inhibitors of P. viticola and B. cinerea. The reaction mixture is enriched in antimicrobial compounds with high potency as it is at least eight times more active than grapevine cane extract against P. viticola. In addition, this reaction mixture reveals a high fungitoxicity against B. cinerea in contrast to the grapevine extract.Conclusion: The present findings indicate that metals could be used for producing highly antimicrobial compounds from natural resveratrol.Significance and impact of the study: In this study, a method to produce active dimeric stilbenes to protect grapevine was developed based on botanical ingredients. The combination of natural extracts, rich in resveratrol, and metals such as copper may be used as alternatives to Bordeaux mixture and chemical fungicides to protect crops.

Mental representation of economic crisis in Italian and Swiss samples 1The authors would like to thank Maurizio Mistri for his help in the construction of items. This research was supported by a grant from the Italian Murst (ex 40%).

2001 ◽  
Vol 60 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Lucia Savadori ◽  
Eraldo Nicotra ◽  
Rino Rumiati ◽  
Roberto Tamborini
Keyword(s):  
Economic Crisis ◽  
Mental Representation ◽  
Mental Representations ◽  
Social Contexts ◽  
Raw Material ◽  
National Context ◽  
Cluster Procedure ◽  
Total N ◽  
Two Samples ◽  
Important Symptom

The content and structure of mental representation of economic crises were studied and the flexibility of the structure in different social contexts was tested. Italian and Swiss samples (Total N = 98) were compared with respect to their judgments as to how a series of concrete examples of events representing abstract indicators were relevant symptoms of economic crisis. Mental representations were derived using a cluster procedure. Results showed that the relevance of the indicators varied as a function of national context. The growth of unemployment was judged to be by far the most important symptom of an economic crisis but the Swiss sample judged bankruptcies as more symptomatic than Italians who considered inflation, raw material prices and external accounts to be more relevant. A different clustering structure was found for the two samples: the locations of unemployment and gross domestic production indicators were the main differences in representations.

Raw material mix optimization system for sintering plant and blast furnace at CST

2006 ◽  
Vol 103 (2) ◽  
pp. 76-81
Author(s):  
C. Perin Filho ◽  
D. Tassinari Miranda ◽  
E. Medeiros Milanez ◽  
E. Luiz Massanori Harano ◽  
E. Torres Bispo dos Santos ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Raw Material ◽  
Optimization System ◽  
Raw Material Mix ◽  
Sintering Plant
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