8.4.5. Nitromercuration Reactions 3878 9. Hydroamination of Alkenes and Alkynes under Microwave Irradiation 3878 * To whom correspondence should be addressed. Phone: +49 241 8

Hydroamination: direct addition of amines to alkenes and alkynes.

Nanographenes, or extended polycyclic aromatic hydrocarbons, have been attracting renewed and more widespread attention since the first experimental demonstration of graphene in 2004. However, the atomically precise fabrication of nanographenes has thus far been achieved only through synthetic organic chemistry. The precise synthesis of quasi-zero-dimensional nanographenes, i.e. graphene molecules, has witnessed rapid developments over the past few years, and these developments can be summarized in four categories: (1) non-conventional methods, (2) structures incorporating seven- or eight-membered rings, (3) selective heteroatom doping, and (4) direct edge functionalization. On the other hand, one-dimensional extension of the graphene molecules leads to the formation of graphene nanoribbons (GNRs) with high aspect ratios. The synthesis of structurally well-defined GNRs has been achieved by extending nanographene synthesis to longitudinally extended polymeric systems. Access to GNRs thus becomes possible through the solution-mediated or surface-assisted cyclodehydrogenation, or “graphitization,” of tailor-made polyphenylene precursors. In this review, we describe recent progress in the “bottom-up” chemical syntheses of structurally well-defined nanographenes, namely graphene molecules and GNRs.

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New advances in nanographene chemistry

Metal-ligand cooperation (MLC) has become an important concept in catalysis by transition metal complexes both in synthetic and biological systems. MLC implies that both the metal and the ligand are directly involved in bond activation processes, by contrast to "classical" transition metal catalysis where the ligand (e.g. phosphine) acts as a spectator, while all key transformations occur at the metal center. In this Review, we will discuss examples of MLC in which 1) both the metal and the ligand are chemically modified during bond activation and 2) bond activation results in immediate changes in the 1st coordination sphere involving the cooperating ligand, even if the reactive center at the ligand is not directly bound to the metal (e.g. via tautomerization). The role of MLC in enabling effective catalysis as well as in catalyst deactivation reactions will be discussed.

Metal–Ligand Cooperation

6.2. Photosystem II as a Source of Inspiration 2364 6.3. Ruthenium Complexes 2364 6.4. Manganese Complexes 2365 6.5. Concluding Remarks 2366 7. Reduction of Carbon Dioxide 2366 7.

Molecular Catalysis of Electrochemical Reactions. Mechanistic Aspects

FI catalysts for olefin polymerization--a comprehensive treatment.

Non-cyclopentadienyl ancillaries in organogroup 3 metal chemistry: a fine balance in ligand design

A New Chelating Anilido-Imine Donor Related to β-Diketiminato Ligands for Stabilization of Organoyttrium Cations

A series of alkyl (1−3), aryl (6), and benzo-annulated (4, 5) heteroaromatic triphenylene analogues with B2N2C2 cores have been synthesized via chelation of pyridazine derivatives using difunctional Lewis acidic diborabiphenyl precursors. In contrast to triphenylene, NICS(1) calculations on 1 suggested high aromaticities for the central (−11.3 ppm) and outer borabenzene rings (−7.7 ppm), along with nonaromatic behavior for the pyridazine ring (−0.7 ppm). Crystal structure analyses supported this analysis. When the a- and c-faces of the pyridazine moiety were free of substitution (1, 3), planar structures resulted, but upon substitution, a twisted B2N2C2 core was observed due to steric repulsion of neighboring hydrogen atoms (e.g., 5). The increase of steric bulk from H (1) to iPr (3) in the planar species was found to result in a dimeric, head-to-tail herringbone packing motif, held together by close intermolecular B···N interactions of 3.39 A. One-electron reduction by Cp*2Co was found to afford the radi...

David J. H. Emslie

Papers

Non-cyclopentadienyl ancillaries in organogroup 3 metal chemistry: a fine balance in ligand design

A New Chelating Anilido-Imine Donor Related to β-Diketiminato Ligands for Stabilization of Organoyttrium Cations

Triphenylene analogues with B2N2C2 cores: synthesis, structure, redox behavior, and photophysical properties.

Organometallic complexes of scandium and yttrium supported by a bulky salicylaldimine ligand

2,2′‐Diborabiphenyl: A Lewis Acid Analogue of 2,2′‐Bipyridine