Abstract
The ruthenium chelates containing tethered olefinic side chains [Ru(η2:η5-C5Me4CH2O(CH2)nCH=CHR2)(CO)2]+BF4ȡ (1a, R2 = H, n = 1; 1b, R2 = Me, n = 1; 1c, R2 = H, n = 2) react with NaBH4 in MeOH or in water to give the non-chelated olefin hydride complexes [Ru(η5-C5Me4CH2O(CH2)nCH=CHR2)(CO)2(H)] (2aȁc). By contrast, alkoxide attacked at a carbonyl ligand in 1a giving the chelated olefin alkoxycarbonyl complexes [Ru(η2:η5-C5Me4CH2OCH2CH=CH2)(η1-COOR3)(CO)](3a,aȃ, R3 = Me; 4a,aȃ, R3 = Et), which form a separable mixture of diastereomers. There was no evidence for attack at the coordinated olefin in complex 1.
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