Results 41 to 50 of about 51,500 (206)
ChemistryEurope, EarlyView.A modular synthetic approach enables the preparation of azulene‐fused heterocycles via nucleophilic aromatic substitution followed by intramolecular cyclization of alkynyl fluoroazulenes. The method allows the incorporation of various heteroatoms (N, O, S, Se, and Te), leading to structurally diverse heteroannulated azulenes.
Martin C. Dietl +8 more
wiley +1 more source
Edge modification of PAHs: the effect of embedded heterocycles on the aromaticity pattern [PDF]
, 2015 International audienceAromaticity studies carried out on the condensed model system 2 with different heteroatoms showed that the NICS(1) aromaticity in the five-membered ring correlates with that in the parent five-membered ring having the same ...
Bouit, Pierre-Antoine +3 more
core +3 more sources
Twisted 1‐ and 2‐Azaperopyrenes: Synthesis, Structure, and Properties
Chemistry – A European Journal, EarlyView.ABSTRACT A synthesis of hitherto unknown 1‐ and 2‐azaperopyrenes, twisted nitrogen‐doped peropyrenes, is reported. The synthesis is based on a Brønsted acid‐mediated benzannulation of alkynes. Key alkyne intermediates are synthesized via two complementary routes, including a Pd/C‐catalyzed, copper‐ and amine‐free Sonogashira‐type coupling of (hetero ...
Ricardo Molenda +4 more
wiley +1 more source
On the performance of negative impedance converters (NICs) to achieve active metametrials [PDF]
, 2010 One of the main drawbacks when designing microwave circuits or antennas based on metamaterial particles is its inherent low bandwidth and not very good efficiency. An attempt to overcome this problem is based on using negative impedance converters (NICs).
García Muñoz, Luis Enrique +4 more
core
Scalable Layer-2/Layer-3 Multistage Switching Architectures for Software Routers [PDF]
, 2006 Software routers are becoming an important alternative to proprietary and expensive network devices, because they exploit the economy of scale of the PC market and open-source software.
Bianco, Andrea +5 more
core +1 more source
Chemistry – A European Journal, EarlyView.ABSTRACT Molecules that violate Hund's rule by exhibiting an inverted singlet–triplet gap (STG), where the first excited singlet (S1${\rm S}_1$) lies below the triplet (T1${\rm T}_1$), are rare but hold great promise as efficient fifth‐generation light emitters.
Atreyee Majumdar +1 more
wiley +1 more source
Plant Production ScienceThe source capacity affects grain yields. Many efforts have been made to enhance grain yields by introducing quantitative trait loci (QTLs) responsible for shoot-related traits associated with source capacity. Root-related traits could improve the source
Momoha Iba +6 more
doaj +1 more source
, 2016 Themis is an old and statistically robust asteroid family populating the outer main belt, and resulting from a catastrophic collision that took place 2.5$\pm$1.0 Gyr ago.
Barucci, M. A. +5 more
core +3 more sources
Methylene‐Bridged Calixarene Polyhedra: An Elusive Class of Symmetric Molecular Architectures
Helvetica Chimica Acta, EarlyView.An overview of purely hypothetical methylene‐bridged calixarene polyhedral molecular architectures is presented. In addition to the five previously postulated structures, we propose a calix[5]arene‐based icosidodecahedron as a new member of this class. Computational assessments of stability and strain indicate that methanospherophane is likely the most
Aleksandr Kharchenko +3 more
wiley +1 more source
Proteomes, 2014 Once candidate genes are available, the application of genetic transformation plays a major part to study their function in plants for adaptation to respective environmental stresses, including waterlogging (WL).
Emdadul Haque +6 more
doaj +1 more source