Cβ–Cβ Bond Fission of Metallacyclopentadiene over a Low-Valent Ditantalum Scaffold

Autor:	Payel Laskar, Hayato Tsurugi, Hideaki Ikeda, Keishi Yamamoto, Kazushi Mashima, Kohei Nishi
Rok vydání:	2019
Předmět:	010405 organic chemistry Fission Chemistry Organic Chemistry Tantalum chemistry.chemical_element 010402 general chemistry 01 natural sciences 0104 chemical sciences Adduct Inorganic Chemistry Crystallography Moiety Physical and Theoretical Chemistry Bond cleavage
Zdroj:	Organometallics. 38:722-729
ISSN:	1520-6041 0276-7333
DOI:	10.1021/acs.organomet.8b00914
Popis:	The Cβ–Cβ bond fission of a tantallacyclopentadiene moiety bridged over low-valent Ta(V)–Ta(III) dinuclear tantalum complex 2, having an infinite structure, was facilitated by the coordination of 1,10-phenanthroline (PHEN) to give a doubly η2-alkyne-bridged ditantalum complex (phen)Cl2Ta(μ,η2-C2Et2)2TaCl2(phen) (8), while the corresponding high oxidation Ta(V)–Ta(V) complex, Cl2Ta(μ,η4-C4Et4)(μ-Cl)TaCl3 (1), afforded Cl3Ta(μ,η4-C4Et4)(μ-Cl)TaCl2(phen) (7) with an intact metallacyclopentadiene structure. Characterization of 2 was confirmed by isolating a DME adduct 9 derived from a mixture of complex 2 and DME. In contrast, no Cβ–Cβ bond cleavage was observed for azine-coordinated ditantalum complexes 5 and 6 as well as their reduced species: PHEN was found to be essentially required for the transformation of the tantallacyclopentadiene.
Databáze:	OpenAIRE
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