Copper(I)−Olefin Complexes: The Effect of the Trispyrazolylborate Ancillary Ligand in Structure and Reactivity

2010 ◽  
Vol 29 (16) ◽  
pp. 3481-3489 ◽  
Author(s):  
Carmen Martín ◽  
José María Muñoz-Molina ◽  
Abel Locati ◽  
Eleuterio Alvarez ◽  
Feliu Maseras ◽  
...  
Keyword(s):  
Ancillary Ligand

Imine as a Linchpin Approach for Distal C(sp2)–H Functionalization

2020 ◽  
Author(s):  
Sukdev Bag ◽  
Sadhan Jana ◽  
Sukumar Pradhan ◽  
Suman Bhowmick ◽  
Nupur Goswami ◽  
...  
Keyword(s):  
Organic Molecules ◽  
Bond Activation ◽  
Bond Formation ◽  
Ancillary Ligand ◽  
Significant Challenge ◽  
Site Selectivity ◽  
Directing Group ◽  
Covalently Linked ◽  
Complex Organic ◽  
Post Functionalization

<p>Despite the widespread applications of C–H functionalization, controlling site selectivity remains a significant challenge. Covalently attached directing group (DG) served as an ancillary ligand to ensure proximal <i>ortho</i>-, distal <i>meta</i>- and <i>para</i>-C-H functionalization over the last two decades. These covalently linked DGs necessitate two extra steps for a single C–H functionalization: introduction of DG prior to C–H activation and removal of DG post-functionalization. We introduce here a transient directing group for distal C(<i>sp<sup>2</sup></i>)-H functionalization <i>via</i> reversible imine formation. By overruling facile proximal C-H bond activation by imine-<i>N</i> atom, a suitably designed pyrimidine-based transient directing group (TDG) successfully delivered selective distal C-C bond formation. Application of this transient directing group strategy for streamlining the synthesis of complex organic molecules without any necessary pre-functionalization at the distal position has been explored.</p>

Ancillary Ligand Effect on Single-Site Styrene Polymerization:  Isospecificity of Group 4 Metal Bis(phenolate) Catalysts

2003 ◽  
Vol 125 (17) ◽  
pp. 4964-4965 ◽  
Author(s):  
Carmine Capacchione ◽  
Antonio Proto ◽  
Henner Ebeling ◽  
Rolf Mülhaupt ◽  
Klaus Möller ◽  
...  
Keyword(s):  
Single Site ◽  
Ancillary Ligand ◽  
Ligand Effect ◽  
Styrene Polymerization ◽  
Group 4 ◽  
Group 4 Metal

Exploring the reactivity of manganese(iii) complexes with diphenolate-diamino ligands in rac-lactide polymerization

2015 ◽  
Vol 44 (47) ◽  
pp. 20449-20458 ◽  
Author(s):  
Pargol Daneshmand ◽  
Frank Schaper
Keyword(s):  
Ancillary Ligand ◽  
Lactide Polymerization

Diamino-diphenolato manganese(iii) complexes polymerize rac-lactide via a coordination–insertion or an activated monomer mechanism, depending on the ancillary ligand.

Sign in / Sign up

Export Citation Format

Share Document