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.

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.

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.

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.

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.

Photoredox/Pd dual-catalytic three-component cross-coupling

2020 ◽  
Author(s):  
Logan Forshee ◽  
Kaitie Cartwright ◽  
Jon Tunge ◽  
Megan Hegarty
Keyword(s):  
Cross Coupling

Conclusion: What is Speculative Empiricism?

2018 ◽  
Author(s):  
Didier Debaise
Keyword(s):  
Social Groups ◽  
Speculative Philosophy ◽  
System P ◽  
History Of ◽  
Selection Of

Process and Reality ends with a warning: ‘[t]he chief danger to philosophy is narrowness in the selection of evidence’ (PR, 337). Although this danger of narrowness might emerge from the ‘idiosyncrasies and timidities of particular authors, of particular social groups, of particular schools of thought, of particular epochs in the history of civilization’ (PR, 337), we should not be mistaken: it occurs within philosophy, in its activity, its method. And the fact that this issue arises at the end of Process and Reality reveals the ambition that has accompanied its composition: Whitehead has resisted this danger through the form and ambition of his speculative construction. The temptation of a narrowness in selection attempts to expel speculative philosophy at the same time as it haunts each part of its system.

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