Titanium-Mediated C–C Coupling of Imidoylstannanes for the Synthesis of Tetraaryl Diimines. Isolation of Titanium Iminoacyl and Ene-diamido Intermediates
Efficient pyridylbenzamidine ligands for palladium-catalyzed Suzuki-Miyaura reaction
作者:Ying-Tang Huang、Xiao Tang、Yi Yang、Dong-Sheng Shen、Cheng Tan、Feng-Shou Liu
DOI:10.1002/aoc.2913
日期:2012.12
A series of pyridylbenzamidineligands were applied in palladium‐catalyzed Suzuki–Miyaurareactions and the effect of ligand on catalytic properties was evaluated. Under the optimization conditions, the bulky and electron‐donating nitrogen donor ligands were successfully used to catalyze the reaction of a variety of aryl bromides and aryl chlorides with arylboronic acid, giving the desired products
Aluminum Amidinates: Insights into Alkyne Hydroboration
作者:Katie Hobson、Claire J. Carmalt、Clare Bakewell
DOI:10.1021/acs.inorgchem.1c00619
日期:2021.8.2
The mechanism of the aluminum-mediated hydroboration of terminal alkynes was investigated using a series of novel aluminum amidinate hydride and alkyl complexes bearing symmetric and asymmetric ligands. The new aluminum complexes were fully characterized and found to facilitate the formation of the (E)-vinylboronate hydroboration product, with rates and orders of reaction linked to complex size and
使用一系列新型脒基铝氢化物和带有对称和不对称配体的烷基配合物,研究了铝介导的末端炔烃硼氢化反应的机理。新的铝配合物经过充分表征,发现可以促进 ( E )-乙烯基硼酸硼氢化产物的形成,反应速率和级数与配合物的尺寸和稳定性有关。动力学分析和化学计量反应被用来阐明该机制,我们建议通过铝硼烷加合物的初始形成来进行。此外,发现最不稳定的络合物可以促进频那醇硼烷底物分解为硼烷(BH 3 ),然后硼烷可以继续催化反应。这种机制与之前报道的氢化铝催化硼氢化反应相反,后者建议通过最初形成乙炔铝或通过铝氢化形成乙烯基硼酸酯作为催化循环的第一步来进行。
Are Monophospha(III)amidines and ‐guanidines with Ionizable Hydrogens Tautomeric? Towards a Deeper Understanding of Two Related Hetero‐element Functional Groups
作者:Jason D. Masuda、Leila Mokhtabad Amrei、René T. Boeré
DOI:10.1002/ejic.202300495
日期:2023.11.24
Which is preferred, C-amino-(σ2,λ3)-phosphaalkene P=C or C-(σ3,λ3)-phosphinoimine N=C? The answer seems to depend on the backbone substituent R. When R is an aryl group (or hydrogen) P=C is consistently preferred over N=C, though both isomers exist in solution. When R is a tBu or amino group, N=C is preferred, with no evidence for the other isomers in solution.