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Diversity of the Structures in a Distannene Complex and its Reduction to Generate a Six‐Membered Ti 2 Sn 4 Ring Complex
Author(s) -
Kuwabara Takuya,
Guo Jing Dong,
Nagase Shigeru,
Saito Masaichi
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201308565
Subject(s) - delocalized electron , ring (chemistry) , electron paramagnetic resonance , crystallography , chemistry , resonance (particle physics) , olefin fiber , electronic structure , stereochemistry , computational chemistry , nuclear magnetic resonance , atomic physics , physics , polymer , organic chemistry
In contrast to olefin complexes, their congeners of heavier elements display various coordination modes, and their complexes may be present as bis(metallylene) complexes, with side‐on coordination, as metallacyclopropanes, or as π complexes. In the course of our studies on the reactivity of dilithiostannoles towards transition‐metal reagents, three‐membered TiSn 2 and six‐membered Ti 2 Sn 4 ring complexes were obtained. According to its geometric parameters, NMR analysis, and theoretical calculations, the TiSn 2 complex cannot be categorized into any of these previously described bonding modes. Therefore, a novel resonance structure has been proposed for a complex that has a delocalized σ‐orbital over the TiSn 2 ring to understand its electronic structure. The mechanism for the formation of the Ti 2 Sn 4 ring complex and its EPR spectrum are also discussed.