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2017 | Buch

Visible Light Photocatalyzed Redox-Neutral Organic Reactions and Synthesis of Novel Metal-Organic Frameworks

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Über dieses Buch

This unique thesis discusses the development of conceptually novel and synthetically valuable methods that use visible light photocatalysis. Each chapter addresses a different topic in the emerging field of photocatalysis, which has become an indispensable tool for organic synthesis. Photocatalysis employs environmentally harmless and abundant visible light in the presence of a photosensitizer, and as such offers an attractive alternative to harmful UV light in photo-mediated reactions. This book introduces the novel concept of merging gold catalysis with visible light photocatalysis in a dual catalytic fashion, which demonstrates their compatibility with each other for first time and has inspired the development of various reactions. Moreover, a novel trifluoromethylation method, which combines radical addition chemistry with a polar rearrangement to synthesize valuable fluorinated compounds, is presented, since compounds featuring fluorinated functionality are the subject of increasing attention in pharmaceutical, agrochemical and material research. It also develops an external photocatalyst-free photochemical method for the synthesis of valuable indolizine heterocycles, where the product mediates its own formation. Lastly, it describes the synthesis and characterization of two novel highly porous metal-organic frameworks (MOFs). The comprehensive text is rounded out with illustrations and color figures.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction to Photocatalysis
Abstract
The year 2012 was the centenary of the famous article “The photochemistry of the future”. In this inspiring article, the Italian photochemist G. Ciamician presented his great vision of the future aspects of solar energy imagining a chemical industry where chemicals could be manufactured in a similar way to photosynthesis as used by plants in the presence of sunlight.
Basudev Sahoo
Chapter 2. Dual Gold and Visible Light Photoredox-Catalyzed Heteroarylations of Non-activated Alkenes
Abstract
Gold (Au) is a third row noble transition metal belonging to group 11 of the periodic table and is situated below silver in the coinage metal series. Gold with the ground state electronic configuration [Xe]4f145d106s1 has highest first ionization potential (E Au(I)/Au(0) 0  = +1.69 V vs. SHE) among d-block elements, due to the relativistic contraction of 6s atomic orbital.
Basudev Sahoo
Chapter 3. Visible Light Photoredox Catalyzed Trifluoromethylation-Ring Expansion via Semipinacol Rearrangement
Abstract
Fluorine, with ground state electronic configuration [He]2s22p5, is the first member of the halogen series (Group 9) in the periodic table. It also has the second smallest atomic radius after hydrogen (rw = 1.47 and 1.20 Å, respectively) and it is the most electronegative element in the periodic table; electronically, fluorine is more similar to its neighbor oxygen (Pauling scale: χ(F): 4.0 and χ(O): 3.5) than other halogens.
Basudev Sahoo
Chapter 4. Transition Metal Free Visible Light-Mediated Synthesis of Polycyclic Indolizines
Abstract
Indolizine is a heterocyclic aromatic compound bearing a bridging nitrogen atom. In this heterocyclic compound, a five membered π-electron-rich pyrrole ring is fused to a six membered π-electron-deficient pyridine ring.
Basudev Sahoo
Chapter 5. Synthesis and Characterizations of Novel Metal-Organic Frameworks (MOFs)
Abstract
Metal-organic frameworks (MOFs) are an exciting class of porous crystalline materials. Although crystalline materials have received the attention of scientists since 1960s, the concept of metal-organic frameworks (MOFs) began to be popularized in 1990s. Metal-organic frameworks (MOFs) are highly crystalline, porous inorganic and organic hybrid materials with a giant network structure in contrast to purely inorganic zeolites, molecular sieves and purely organic activated carbons.
Basudev Sahoo
Chapter 6. Experimental Section
Abstract
Complete characterisation (R f, NMR, IR, MS) was carried out for compounds without literature precedence. Unless otherwise noted, all reactions were carried out in flame-dried glassware under argon atmosphere.
Basudev Sahoo
Backmatter
Metadaten
Titel
Visible Light Photocatalyzed Redox-Neutral Organic Reactions and Synthesis of Novel Metal-Organic Frameworks
verfasst von
Basudev Sahoo
Copyright-Jahr
2017
Electronic ISBN
978-3-319-48350-4
Print ISBN
978-3-319-48349-8
DOI
https://doi.org/10.1007/978-3-319-48350-4

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