scholarly journals Ni vs. Pd in Suzuki–Miyaura sp2–sp2 cross-coupling: a head-to-head study in a comparable precatalyst/ligand system

2019 ◽  
Vol 17 (20) ◽  
pp. 5055-5059 ◽  
Author(s):  
Matthew J. West ◽  
Allan J. B. Watson
Keyword(s):  
Cross Coupling ◽  
Ligand System ◽  
System P

A head-to-head study of comparable pre-catalysts in Suzuki–Miyaura cross-coupling.

scholarly journals Photoinduced oxidative activation of electron-rich arenes: alkenylation with H2 evolution under external oxidant-free conditions

2018 ◽  
Vol 9 (6) ◽  
pp. 1521-1526 ◽  
Author(s):  
Xia Hu ◽  
Guoting Zhang ◽  
Faxiang Bu ◽  
Xu Luo ◽  
Kebing Yi ◽  
...  
Keyword(s):  
Catalytic System ◽  
Cross Coupling ◽  
H2 Evolution ◽  
System P ◽  
Oxidative Activation

An external oxidant-free cross-coupling of electron-rich arenes and styrenes was enabled by a dual photoredox-cobaloxime catalytic system.

Lanthanide extraction selectivity of a tripodal carbamoylmethylphosphine oxide ligand system

2018 ◽  
Vol 47 (40) ◽  
pp. 14318-14326 ◽  
Author(s):  
Michael G. Patterson ◽  
Andrew K. Mulville ◽  
Emily K. Connor ◽  
Alyssa T. Henry ◽  
Michael L. Hudson ◽  
...  
Keyword(s):  
Ligand Structure ◽  
Ligand System ◽  
System P ◽  
Extraction Selectivity

Lanthanide extraction selectivity is attained by variation of the ligand structure and extraction conditions for a series of CMPO-based ligands.

scholarly journals Dramatic rate-enhancement of oxygen atom transfer by an iron(iv)-oxo species by equatorial ligand field perturbations

2018 ◽  
Vol 47 (42) ◽  
pp. 14945-14957 ◽  
Author(s):  
Gourab Mukherjee ◽  
Calvin W. Z. Lee ◽  
Sayanta Sekhar Nag ◽  
Aligulu Alili ◽  
Fabián G. Cantú Reinhard ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Coordination Sphere ◽  
Ligand Field ◽  
Atom Transfer ◽  
Oxygen Atom Transfer ◽  
Rate Enhancement ◽  
Ligand System ◽  
System P ◽  
Equatorial Ligand

The reactivity and characterization of a novel iron(iv)-oxo species is reported that gives enhanced reactivity as a result of second-coordination sphere perturbations of the ligand system.

scholarly journals A one-pot tandem chemoselective allylation/cross-coupling via temperature control of a multi-nucleophile/electrophile system

2017 ◽  
Vol 53 (65) ◽  
pp. 9139-9142 ◽  
Author(s):  
Chao Xu ◽  
James W. B. Fyfe ◽  
Ciaran P. Seath ◽  
Steven H. Bennett ◽  
Allan J. B. Watson
Keyword(s):  
Natural Product ◽  
Temperature Control ◽  
Cross Coupling ◽  
Reactive System ◽  
One Pot ◽  
System P

Chemoselective control of a multi-reactive system allows two sequential C–C bond formations via two distinct reactivity modes, accessing pharmaceutical and natural product scaffolds.

Pd-Catalyzed regioselective intramolecular dehydrogenative C-5 cross coupling in anN-substituted pyrrole-azole system

2017 ◽  
Vol 15 (47) ◽  
pp. 10082-10086 ◽  
Author(s):  
Krishna N. Tripathi ◽  
Devalina Ray ◽  
Ravi P. Singh
Keyword(s):  
Cross Coupling ◽  
System P

A C5-selective intramolecular dehydrogenative cross coupling inN-substituted pyrrole-azoles in the presence of a reactive C2 position is achieved.

Comparison of TEM and STM observations of small silver clusters on different carbon supports

1990 ◽  
Vol 48 (4) ◽  
pp. 264-265
Author(s):  
Bernd Tesche ◽  
Tobias Schilling
Keyword(s):  
Vibration Isolation ◽  
Pyrolytic Graphite ◽  
Carbon Film ◽  
Silver Clusters ◽  
Carbon Supports ◽  
Stacking Order ◽  
System P ◽  
High Resolution Tem ◽  
High Degree ◽  
Degree Of Order

The objective of our work is to determine:a) whether both of the imaging methods (TEM, STM) yield comparable data andb) which method is better suited for a reliable structure analysis of microclusters smaller than 1.5 nm, where a deviation of the bulk structure is expected.The silver was evaporated in a bell-jar system (p 10−5 pa) and deposited onto a 6 nm thick amorphous carbon film and a freshly cleaved highly oriented pyrolytic graphite (HOPG).The average deposited Ag thickness is 0.1 nm, controlled by a quartz crystal microbalance at a deposition rate of 0.02 nm/sec. The high resolution TEM investigations (100 kV) were executed by a hollow-cone illumination (HCI). For the STM investigations a commercial STM was used. With special vibration isolation we achieved a resolution of 0.06 nm (inserted diffraction image in Fig. 1c). The carbon film shows the remarkable reduction in noise by using HCI (Fig. 1a). The HOPG substrate (Fig. 1b), cleaved in sheets thinner than 30 nm for the TEM investigations, shows the typical arrangement of a nearly perfect stacking order and varying degrees of rotational disorder (i.e. artificial single crystals). The STM image (Fig. 1c) demonstrates the high degree of order in HOPG with atomic resolution.

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