Azo-Coupling Reactions Used in Analytical Chemistry: The Role of Reactants, Intermediates, and Aqueous Medium

2004 ◽  
Vol 87 (6) ◽  
pp. 1561-1573 ◽  
Author(s):  
Alexei N. Pankratov
Keyword(s):  
Analytical Chemistry ◽  
Aqueous Medium ◽  
Coupling Reactions ◽  
Azo Coupling

scholarly journals Oxidation of Terpenoids to Achieve High-Value Flavor and Fragrances—Questioning Microalgae Oxidative Capabilities in the Biotransformation of the Sesquiterpene Valencene and of Selected Natural Apocarotenoids

Chemistry ◽  
2021 ◽  
Vol 3 (3) ◽  
pp. 821-830
Author(s):  
Davide De Simeis ◽  
Stefano Serra ◽  
Alessandro Di Fonzo ◽  
Francesco Secundo
Keyword(s):  
Experimental Data ◽  
Natural Products ◽  
Aqueous Medium ◽  
Photochemical Reaction ◽  
Substrate Oxidation ◽  
Market Size ◽  
Chlorella Sp ◽  
General Opinion ◽  
Natural Way

Natural flavor and fragrance market size is expected to grow steadily due to the rising consumer demand of natural ingredients. This market request is guided by the general opinion that the production of natural compounds leads to a reduction of pollution, with inherent advantages for the environment and people’s health. The biotransformation reactions have gained high relevance in the production of natural products. In this context, few pieces of research have described the role of microalgae in the oxidation of terpenoids. In this present study, we questioned the role of microalgal based oxidation in the synthesis of high-value flavors and fragrances. This study investigated the role of three different microalgae strains, Chlorella sp. (211.8b and 211.8p) and Chlorococcum sp. (JB3), in the oxidation of different terpenoid substrates: α-ionone, β-ionone, theaspirane and valencene. Unfortunately, the experimental data showed that the microalgal strains used are not responsible for the substrate oxidation. In fact, our experiments demonstrate that the transformation of the four starting compounds is a photochemical reaction that involves the oxygen as oxidant. Even though these findings cast a shadow on the use of these microorganisms for an industrial purpose, they open a new possible strategy to easily obtain nootkatone in a natural way by just using an aqueous medium, oxygen and light.

Formation of cyclopropylazoarenes in the azo coupling reactions of the cyclopropanediazonium ion with active aromatic compounds

2002 ◽  
Vol 12 (3) ◽  
pp. 104-105 ◽  
Author(s):  
Yury V. Tomilov ◽  
Irina V. Kostyuchenko ◽  
Evgeny V. Shulishov ◽  
Oleg M. Nefedov
Keyword(s):  
Aromatic Compounds ◽  
Coupling Reactions ◽  
Azo Coupling

Evidence of Reversibility in Azo-Coupling Reactions between 1,3,5-Tris(N,N-dialkylamino)benzenes and Arenediazonium Salts

2007 ◽  
Vol 72 (23) ◽  
pp. 8741-8747 ◽  
Author(s):  
Carla Boga ◽  
Erminia Del Vecchio ◽  
Luciano Forlani ◽  
Silvia Tozzi
Keyword(s):  
Coupling Reactions ◽  
Azo Coupling ◽  
Arenediazonium Salts
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