25287-19-8Relevant articles and documents
Mononuclear dpp-Bian gallium complexes: Synthesis, crystal structures, and reactivity toward alkynes and enones
Fedushkin, Igor L.,Kazarina, Olga V.,Lukoyanov, Anton N.,Skatova, Alexandra A.,Bazyakina, Natalia L.,Cherkasov, Anton V.,Palamidis, Eftimios
, p. 1498 - 1506 (2015)
Treatment of (dpp-Bian)Ga-Ga(dpp-Bian) (1) (dpp-Bian = 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene) with iodine gives (dpp-Bian)Ga(I)-Ga(I)(dpp-Bian) (2), which reacts in situ with K(C5H4CH2CH2NMe2) (KCpDo) or K(OCH2CH2NMe2) (KORDo) to produce the monomeric species (dpp-Bian)GaCpDo (3) and (dpp-Bian)GaORDo (4), respectively. Complex 3 reacts with PhCi≡CH to give the paramagnetic derivative (dpp-Bian)Ga(Ci≡CPh)2 (5), while compound 4 is inert toward this alkyne. In contrast, monomeric (dpp-Bian)Ga(S2CNMe2) (6) reacts with PhCi≡CH and HCi≡CH to give the cycloaddition products [dpp-Bian(PhC=CH)]Ga(S2CNMe2) (7) and [dpp-Bian(HC=CH)]Ga(S2CNMe2) (8). The related compounds [dpp-Bian(MeC=CC(O)OMe)]Ga(S2CNMe2) (9) and [dpp-Bian(CH2CH=C(Me)O)]Ga(S2CNMe2) (10) have been obtained in the reactions of complex 6 with methyl 2-butynoate and methyl vinyl ketone, respectively. New complexes have been characterized by 1H NMR (3, 4, and 7-10) and ESR (5) spectroscopy; their molecular structures have been established by single-crystal X-ray analysis. The catalytic activity of complex 6 in the hydroamination and hydroarylation of alkynes has been examined.
Deposition of highly dispersed gold nanoparticles onto metal phosphates by deposition-precipitation with aqueous ammonia
Kamata, Keigo,Miura, Hiroki,Nishio, Hidenori,Shishido, Tetsuya
, p. 7141 - 7150 (2021/11/17)
An efficient method for depositing gold nanoparticles onto metal phosphate has been developed. Deposition-precipitation with aqueous ammonia enabled small gold nanoparticles to be deposited onto a series of metal phosphates with high dispersity and density. A detailed investigation of the mechanism of the formation of gold nanoparticles corroborated that strong interaction between a gold-ammine complex formed by the treatment of HAuCl4 with ammonia and positively-charged metal phosphates was responsible for the formation of highly dispersed gold nanoparticles. Furthermore, the thus-prepared gold catalysts supported on metal phosphates showed higher catalytic activity than those supported on metal oxides for the hydroamination of terminal alkynes. This journal is
Single-Step Synthesis of Dinuclear Neutral Gold(I) Complexes with Bridging Di(N-heterocyclic carbene) Ligands and Their Catalytic Performance in Cross Coupling Reactions and Alkyne Hydroamination
Baron, Marco,Battistel, Edoardo,Tubaro, Cristina,Biffis, Andrea,Armelao, Lidia,Rancan, Marzio,Graiff, Claudia
, p. 4213 - 4223 (2018/11/23)
We report on a single-step procedure for the synthesis of dinuclear gold(I) complexes with bridging di(N-heterocyclic carbene) (diNHC) ligands of general formula Au2Br2L1-9 (L = diNHC). The obtained complexes differ in the bridging group between the carbene donors and in the terminal wingtip substituents at the imidazol-2-ylidene rings. The complexes have been characterized by means of elemental analysis, NMR spectroscopy, ESI-MS spectrometry, and single-crystal X-ray structure analysis. The dinuclear gold(I) complexes have been tested as homogeneous catalysts in technologically relevant reactions such as the cross coupling between phenylboronic acid and aryl bromides and the intermolecular hydroamination of alkynes. The catalytic performance has been compared for complexes Au2Br2L1-9 and the benchmark mononuclear complex IPrAuCl.