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The species present in solutions of [12]crown-4, [15]crown-5, and [18]crown-6 complexes with BeCl2 were investigated by 1H, 13C, and 9Be NMR spectroscopy. These are [(BeCl)([12]crown-4)]+ (1), [(BeCl2)([15]crown-5)] (2), and [(BeCl2)2([18]crown-6)] (3), however in solution the majority of the crown ethers is not bound to beryllium. In case of [12]crown-4 and [18]crown-6 huge amounts of precipitate are formed, which were identified to be [(BeCl)([12]crown-4)]Cl (1a) and compound 3, while [15]crown-5 is capable of dissolving more than one equivalent of BeCl2 in dichloromethane.
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