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Search for "silver salt" in Full Text gives 31 result(s) in Beilstein Journal of Organic Chemistry.
The role of silver additives in gold-mediated C–H functionalisation
Beilstein J. Org. Chem. 2011, 7, 892–896, doi:10.3762/bjoc.7.102
- functionalisation of aromatic C–H bonds. Doubt is cast on the commonly cited route of halide abstraction from gold and evidence of substrate activation is given. Keywords: C–H functionalisation; gold catalyst; halide abstraction; N-heterocyclic carbene; silver salt; substrate activation; Introduction The use of
- suggests that complex 3 is indeed an intermediate. However, the use of a silver salt was essential for the reaction to proceed. The silver salt was suspected of abstracting the halide from [AuCl(IPr)] to generate a possibly active cationic gold(I) species [20]. To test this hypothesis, the well-defined
- presence of Ag2O, suggesting that silver does not generate cationic gold. The reaction with pivalic acid gave a better conversion, indicating that the gold proceeded via complex 3. Further reactions used 1 as the gold species and no longer included PivOH. The stoichiometric dependence of the silver salt
When gold can do what iodine cannot do: A critical comparison
Beilstein J. Org. Chem. 2011, 7, 847–859, doi:10.3762/bjoc.7.97
- , although all ligands tested with the gold complexes and silver salt AgSbF6 allowed full conversion to the indene. From these results, Sanz and co-workers also reported the corresponding halocyclization of o-alkynylstyrenes to yield 3-halo-1H-indenes by employing NIS as the iodonium source (Scheme 7b) [92
When cyclopropenes meet gold catalysts
Beilstein J. Org. Chem. 2011, 7, 717–734, doi:10.3762/bjoc.7.82
- activators [31]. Since AgOTf and BF3·OEt2 led to the same naphthalene product 21, the authors suspected that traces of the Brønsted acid (HOTf) present in the silver salt may be the actual catalyst and may also modify the regioselectivity observed in the gold-catalyzed reaction. Thus, several basic additives
Rh(I)-catalyzed intramolecular [2 + 2 + 1] cycloaddition of allenenes: Construction of bicyclo[4.3.0]nonenones with an angular methyl group and tricyclo[6.4.0.01,5]dodecenone
Beilstein J. Org. Chem. 2011, 7, 404–409, doi:10.3762/bjoc.7.52
- an atmosphere consisting of 0.2 atm of CO and 0.8 atm of Ar, or of 0.05 atm of CO and 0.95 atm of Ar to produce 8a in 71% and 74% yields, respectively (Table 1, entries 4 and 5). Next, the reaction with [RhCl(CO)dppp]2 in the presence or absence of a silver salt [27][28][29][30][31][32][33][34] was
Synthesis of cationic dibenzosemibullvalene-based phase-transfer catalysts by di-π-methane rearrangements of pyrrolinium-annelated dibenzobarrelene derivatives
Beilstein J. Org. Chem. 2011, 7, 119–126, doi:10.3762/bjoc.7.17
- this purpose, an anionic derivative of benzophenone was prepared and associated with the ammonium functionality of the dibenzobarrelene 2b by anion metathesis (Scheme 5). The known sulfonic acid 4 [20] was transformed to the corresponding silver salt Ag-4 by reaction with Ag2O, and subsequent ion
Diels- Alder reactions using 4,7-dioxygenated indanones as dienophiles for regioselective construction of oxygenated 2,3-dihydrobenz[f]indenone skeleton
Beilstein J. Org. Chem. 2008, 4, No. 15, doi:10.3762/bjoc.4.15
- ], regioselective synthesis of 4,8,9-trioxygenated 2,3-dihydrobenz[f]indenone 4 [22] was a key issue, which was achieved via C ring construction with intramolecular Friedel-Crafts reaction of naphthalenepropanoic acid 5 (path A, Scheme 1) [23]. However, the utilization of a stoichiometric amount of expensive silver
- salt for the synthesis of bromonaphthalene 6 [24] hampered large-scale synthesis of 4. Towards a solution to this problem, we planned the synthesis of 4 via A-ring construction by DAR of indanone-type compounds and oxygenated dienes: i. e. 1) DAR of indanetrione 8 and 1-methoxy-1,3-butadiene (7) (path
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