Synthesis of low oxidation state zinc(I) complexes and their catalytic studies in the dehydroborylation of terminal alkynes

Rajata Kumar Sahoo; Sagrika Rajput; A Ganesh Patro; Sharanappa Nembenna

doi:10.1039/d2dt02846h

Synthesis of low oxidation state zinc(I) complexes and their catalytic studies in the dehydroborylation of terminal alkynes

Dalton Trans. 2022 Oct 25;51(41):16009-16016. doi: 10.1039/d2dt02846h.

Authors

Rajata Kumar Sahoo¹, Sagrika Rajput¹, A Ganesh Patro¹, Sharanappa Nembenna¹

Affiliation

¹ School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI) Bhubaneswar, 752050, India. snembenna@niser.ac.in.

PMID: 36200600
DOI: 10.1039/d2dt02846h

Abstract

A new example of a structurally characterized conjugated bis-guanidinate (CBG) supported zinc(I) dimer, i.e., LZnZnL (3) (L = {(ArNH)(ArN)-CN-C(NAr)(NHAr)}; Ar = 2,6-Et₂-C₆H₃) with a Zn-Zn bond is reported. Moreover, homoleptic (3) and heteroleptic (Cp*ZnZnL, 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-CC-Ph-4-Me)₂, (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.