Search

Optically active, Frechet-type dendrimers containing an emissive X-shaped π-electron system as the core unit were synthesized. Gram-scale optical resolution and transformations of 4,7,12,15-tetrasubstituted [2.2]paracyclophanes were also carried out. The high-generation dendrons effectively absorbed UV light and transferred energy to the core, resulting in high photoluminescence (PL) from the core. In addition, the dendrons sufficiently isolated the emissive X-shaped conjugated core and bright emission was observed from both thin films and solutions. Intense circularly polarized luminescence (CPL) was observed from the thin film. The dendrimer films exhibited excellent optical properties, such as large molar extinction coefficients, high fluorescence quantum efficiencies, intense PL and CPL, and large CPL dissymmetry factors.

Neutral halogenido copper(I) units {CunXn} are widely found in the luminescent copper(I) complexes. In this review, we describe the luminescent properties of complexes with the halogenido-bridged dimeric core, {Cu2(μ-X)2}, which is one of the basic structural motifs of {CunXn}, as well as their synthetic methods and structural features. The available emissive excited states and their approximate energies are discussed by comparing the emission energies among the complexes with different ligand combinations. The trend of the quantum yields in the {Cu2X2} complexes will also be discussed.

Reaction of bisenone (I) under conditions A) produces the desired skeleton (III) via the active intermediate (II).

The thermal rearrangement of dibromides (I) proceeds with a ring expansion to afford a variety of substituted tropolones (II) in good to high yields.

The structures of title carbasugars (I) - (III) are verified by total synthesis, starting from D-mannitol and using a ring closing metathesis as key-step for installation of the cyclohexenyl core unit.

The molecular clustering observed in the fluid nematic phase of nonlinear liquid crystal molecules underlies exaggerated field effects that portend unique technological advances in next-generation liquid crystal displays. However, the detailed nature of the molecular organization within the clusters and the temporal and spatial persistence of the organization remain unclear. Herein we review the evolution of structural studies of this unique nematic phase. The mounting experimental evidence points to a converging picture of the microscopic nature of this relatively new class of liquid crystals.

The synthesis of a novel N-heterocyclic carbene complex composed of a tetracyclic scaffold is disclosed and its usability as a ligand in Pd-catalyzed Suzuki—Miyaura cross-coupling reactions is demonstrated.

The highly strained tricyclo[5.2.1.01,6]decene core (I) of solanoeclepin A is synthesized through two key carbon-carbon bond forming processes.

The synthesis of the naphthoquinone-azepine core (I) of hygrocin B (II) and divergolide C (III) is based on a Diels—Alder approach using an unusual benzoquinone-azepinone dienophile.

Bent-core smectic liquid crystal (LC) phases (B phases) have been widely studied since their unusual polar and chiral properties were discovered in the 1990s. Relatively few studies have examined t...

The title core structure (I) is synthesized in seven steps and 24% overall yield from (2R,3S)-1,2-epoxy-4-penten-3-ol.

We developed a six-step synthesis of the polycyclic core of vincorine using two cascades of reactions. A cascade of Michael–Mannich reactions was employed for one-pot preparation of a polycyclic intermediate, which was transformed into the desired polycyclic pyrroloindoline ring system using a cascade of methanolysis- N -imine cyclization reactions.

The fully functionalized core structure (I) of tagetitoxin is synthesized from tri-O-acetyl-D-galactal.

Pyrazolidines are saturated 5-membered heterocycles with two adjacent nitrogen atoms that share a single bond ( Figure 1 ). This functional group can be found at the core of several potential thera...

The core structure for the first total synthesis of cyanthiwigins A, C, H and G is obtained by formal [4 + 2] cycloaddition, stereospecific 1,4-addition, alkylation, and ring-closing metathesis.

The first total synthesis of hunanamycin A, an antibiotic natural product with a pyrido[1,2,3-de]quinoxaline-2,3-dione core from a marine-derived Bacillus hunanensis, is disclosed. The present effort provides access to sufficient amounts of scarce hunanamycin A for further biological evaluation and confirmation of the assigned absolute configuration. In addition, four new analogues of the natural product are reported.

We report the direct facile high-temperature synthesis and investigation of heterometallic rhenium–molybdenum cluster K6[Re3Mo3S8(CN)4(CN)2/2] (1) with a new {Re3Mo3S8} core. Dissolution of polymeric compound 1 resulted in subsequent oxidation and formation of stable 23e paramagnetic anionic cluster complex [Re3Mo3S8(CN)6]6−.

Xinshengin (I), the first tetracyclic altenusin with an unprecedented altenuene/tetrahydrofuran-fused skeleton core, is obtained from cultures of the endolichenic fungal strain Phialophora spp., along with the new natural compound phialophoriol (II) and a known altenusin.

We report the palladium-catalyzed enantioselective cyclization of 1,6-enamidynes to form spirocyclic ring systems. We applied this methodology to the concise synthesis of the skeletal core of the kopsifoline alkaloids.

Novel benzimidazoles (II) and (IV) as well as the new unsymmetrical benzotristhiazoles (VI) and (VIII) are synthesized.

The first asymmetric synthesis of a synthetic cannabinoid levonantradol was accomplished, and the 3-D solution structure of its core architecture was confirmed by NMR and computational methods.

2,1,3-Benzothiadiazole (BTD) is one of the most important nuclei used in the chemistry of photoluminescent compounds and applicable for light technology. The understanding of its properties and reactions is fundamental for the design and application of these derivatives in molecular organic electronic devices and for other technologies. As a result of their potential as constituents of organic light-emitting diodes, solar cells, liquid crystals, dyes, photovoltaic cells, and many others, attention has been focused on BTD π-extended derivatives with potential use in this exciting area. Herein, we describe their syntheses, properties, reactions, and selected examples of applications in light technology using by BTD (small molecules) as the core.

Compounds (III) and (VII) are tris-(peroxotantalum)-substituted Dawson- and Keggin-type derivatives, whereas (IV) and (VIII) are tetrameric oligomers containing an unprecedented {Ta12} and {Ta16} core, respectively.

Regioselective intramolecular alkenylation of cycloalkenyl bromides offers a unique route to hexahydroindole derivatives.

Providing a comprehensive overview of current developments in innovative materials science and related topics, this book covers the core areas of materials science, inorganic, organic and solid state chemistry.

The introduction of electron-withdrawing CF3 groups has a remarkable influence on the frontier orbital energies of the HBC core.

The title compounds exhibit slightly non-planar core geometries with blue-shifted spectral properties and more negative reduction potentials relative to their known para-counterparts.

Compound (I) shows moderate inhibitory effects on acetylcholinesterase and moderate cytotoxic activity against several human cancer cell lines in vitro.

Mn2O3 homogeneous core/hollow-shell structures with cube-shaped and dumbbell-shaped morphologies are synthesized in high yields from MnCO3 microcubes (obtained from H2O/EtOH solutions of MnSO4, NaHCO3, and (NH4)2SO4, 50 °C, 7 h) or MnCO3 dumbbells (obtained from aqueous solutions of MnCl2, C6H5Na3O7, and NH3, autoclave,160 °C, 2 h).

A series of novel H-shaped molecules (VII) consisting of a 2,3,7,8-tetraazaanthracene core and thiophene arms is described.

Indolizines, electron-rich and electron-deficient heteroarenes such as (VII), and fluorobenzene (IX) are efficiently arylated by various chlorobenzenes in the presence of an optimized catalyst system.

A unique (2,1-b)-indenofluorenyl core flanked with two spirofluorene units, possessing a high triplet energy value and excellent thermal/morphological stability, is reported.

The fully conjugated diimide (III), an organic semiconductor that exhibits ambipolar transport properties, is synthesized in a convenient one-pot, two-step reaction.

All four chromophores show strong fluorescence emission and are soluble in common organic solvents.

The synthesis of the compound (V), which is a key intermediate in the synthesis of cribrostatin 4 can be achieved by a stereoselective cyclization, cf.

The first organic–inorganic hybrid vanadoniobate cluster compounds with a bicapped Keggin-type {VNb12O40(VO)2} core have been synthesized and characterized.

A systematic study on Suzuki—Miyaura or Sonogashira cross coupling reactions for the synthesis of tectons with tetrahedral methane or adamantane core is presented.

An acid-catalyzed Dieckmann-type reaction has been developed to access functionalized bicyclo[3.2.1]alkenediones. This methodology has been successfully extended to more substituted and larger ring homologues, providing a new and efficient route to the core of numerous attractive natural products and their analogues.