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Chemical Structure| 326477-70-7 Chemical Structure| 326477-70-7

Structure of Copper(I) 3-methylsalicylate
CAS No.: 326477-70-7

Chemical Structure| 326477-70-7

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Norman, Jacob Patrick ;

Abstract: Pd-catalyzed cross-couplings rank among the most powerful methods for constructing substituted biaryls, polyaryls, and heteroarenes. Frequently, di- or polyhalogenated (hetero)arenes are employed as starting materials in cross-couplings to access products with increased structural complexity via multiple cross-coupling or substitution steps. N-heteroarenes bearing multiple reactive handles—such as halides, are of particular interest as starting materials since their crosscoupled products can be medicinally relevant. Non-symmetrical dihalogenated N-heteroarenes typically exhibit a site-selectivity bias for C—X bonds which are adjacent to at least one heteroatom in Pd-catalyzed cross-couplings. However, some Pd catalysts—particularly those with hindered ligands, promote atypical selectivity at distal C—X bonds of 2,X-dichloropyridines and related heterocycles during the selectivity-determining oxidative addition step. This dissertation explores the mechanistic origins of these ligand trends and emphasizes the critical importance of Pd’s ligation state—either mono (PdL) or bis (PdL2), in controlling the site of oxidative addition. Ligation state is also relevant when selecting for the products of mono- vs difunctionalization in cross-couplings of dihalogenated substrates, since bisligated 14 e- Pd dissociates quickly from the monofunctionalized intermediate after an initial cross-coupling cycle, whereas monoligated 12 e- Pd is slow to dissociate and may "ring-walk" to the remaining reactive site(s). Additionally, this dissertation explores alternative methods to access minor regioisomers in cross-couplings of dichloro-azines. One approach involves ligand-free conditions where atypical site-selectivity at dichloropyridines and dichloropyrimidines arises from a change in Pd’s speciation from mono- to multinuclearity. Another approach employs a thiolation/Liebeskind-Srogl arylation sequence to achieve site-selectivity which is orthogonal to that of Suzuki-Miyaura couplings.

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Product Details of [ 326477-70-7 ]

CAS No. :326477-70-7
Formula : C8H7CuO3
M.W : 214.69
SMILES Code : O=C([O-])C1=CC=CC(C)=C1O.[Cu+]
MDL No. :MFCD10699180
Boiling Point : No data available
InChI Key :CPPQOSMKJDPRID-UHFFFAOYSA-M
Pubchem ID :54685145

Safety of [ 326477-70-7 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P305+P351+P338
 

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