Sahoo Rajata Kumar, Rajput Sagrika, Patro A Ganesh, Nembenna Sharanappa
School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI) Bhubaneswar, 752050, India.
Dalton Trans. 2022 Oct 25;51(41):16009-16016. doi: 10.1039/d2dt02846h.
A new example of a structurally characterized conjugated bis-guanidinate (CBG) supported zinc(I) dimer, , LZnZnL (3) (L = {(ArNH)(ArN)-CN-C(NAr)(NHAr)}; Ar = 2,6-Et-CH) with a Zn-Zn bond is reported. Moreover, homoleptic (3) and heteroleptic (CpZnZnL, 2, (Cp = 1,2,3,4,5-pentamethyl cyclopentadienide)) zinc(I) dimers are used as precatalysts in the dehydroborylation of a wide array of terminal alkynes. Furthermore, the active catalyst, CBG zinc acetylide (LZn-CC-Ph-4-Me), (5), is isolated which is confirmed by X-ray crystal structure analysis. A series of stoichiometric experiments have been performed to propose a plausible reaction mechanism.
报道了一种结构特征明确的共轭双胍基（CBG）支撑的锌（I）二聚体，LZnZnL（3）（L = {(ArNH)(ArN)-CN-C(NAr)(NHAr)}；Ar = 2,6-Et-CH），其具有Zn-Zn键。此外，同配（3）和异配（CpZnZnL，2，（Cp = 1,2,3,4,5-五甲基环戊二烯基））锌（I）二聚体被用作多种末端炔烃脱氢硼化反应的预催化剂。此外，分离出了活性催化剂CBG乙炔锌（LZn-CC-Ph-4-Me），（5），通过X射线晶体结构分析得到证实。已经进行了一系列化学计量实验以提出合理的反应机理。
