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

A new example of a structurally characterized conjugated bis-guanidinate (CBG) supported zinc( i ) dimer, i.e. , LZnZnL ( 3 ) (L = {(ArNH)(ArN)-C&z.dbd;N-C&z.dbd;(NAr)(NHAr)}; Ar = 2,6-Et 2 -C 6 H 3 ) with a Zn-Zn bond is reported. Moreover, homoleptic ( 3 ) and heteroleptic (Cp*ZnZnL, 2 , (...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2022-10, Vol.51 (41), p.169-1616
Main Authors: Sahoo, Rajata Kumar, Rajput, Sagrika, Patro, A. Ganesh, Nembenna, Sharanappa
Format: Article
Language:English
Subjects:
Alkynes
Crystal structure
Dimers
Oxidation
Reaction mechanisms
Structural analysis
Valence
Zinc
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Summary:A new example of a structurally characterized conjugated bis-guanidinate (CBG) supported zinc( i ) dimer, i.e. , LZnZnL ( 3 ) (L = {(ArNH)(ArN)-C&z.dbd;N-C&z.dbd;(NAr)(NHAr)}; Ar = 2,6-Et 2 -C 6 H 3 ) 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&z.tbd;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. Herein, we report a structurally characterized CBG- supported low oxidation state zinc complex. Further, we have investigated zinc( i ) dimers as selective catalysts for the dehydroborylation of a wide range of terminal alkynes under mild conditions.
ISSN:1477-9226
1477-9234
DOI:10.1039/d2dt02846h