Complexes of copper (I) with triphenylphosphine

Selectivity among Two Lectins: Probing the Effect of Topology, Multivalency and Flexibility of “Clicked” Multivalent Glycoclusters

“…Since the metallation of the porphyrin was the main problem observed, we have selected triphenylphosphine-Cu I complexes, which have been described recently to be more selective in CuAAC. [69] Both the bromide (available from commercial sources) and iodide [70] complexes were used, with or without microwave irradiation. Unfortunately, the partial incorporation of copper ions in the porphyrins core was always observed and the non-metallated porphyrin could not be isolated under these conditions.…”

Copper‐Catalyzed Hydrosilylation with a Bowl‐Shaped Phosphane Ligand: Preferential Reduction of a Bulky Ketone in the Presence of an Aldehyde

“…It is well-known that copper complexes are easy to aggregate. [11] Indeed, it was reported that the copper tetramer with a cubane structure, [{CuCl(PPh 3 )} 4 ], was obtained from the reaction of an equimolar mixture of CuCl and PPh 3 . [12] In contrast, when the similar reaction of an equimolar mixture of CuCl and 2 was carried out, a lower-nuclearity complex, the copper dimer [{CuCl(2)} 2 ] was obtained in 54 % yield; the structure was confirmed by X-ray crystallography (Figure 2).…”

<i>In Situ</i> Protection Methodology in Carbonyl Chemistry

“…These workers observed that CuCl/tBuONa and the highly bulky bowl-shaped phosphane (bsp) ligand (Chart 21) comprise a catalytic system that can be used to promote selective hydrosilylation reactions of typically poorly reactive bulky ketones with Ph 2 SiH 2 in the presence of their non-bulky counterparts (Table 13). The key feature driving the selectivity of this process is found in the aggregation/disaggregation processes that occur via interactions of the copper complexes with ketones 35,36) (Chart 22). Both ketones and aldehyde reversibly form complexes with the copper hydride species ligated to the phosphine.…”