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This material was prepared using minor modifications to a literature procedure [2]. 2-Methylallylmagnesium chloride was found to be poorly soluble in Et2O and
therefore THF was used as the solvent. The Grignardreagent (2 M, 6 ml, 12 mmol; prepared from Mg and 3-chloro-2-methylpropene in THF) was added to a
suspension of [RuCl2(cod)]x (0.28 g, 1.0 mmol Ru) in Et2O (10 ml):THF (15 ml) and the mixture stirred at 20¡ãC for 10 min. The excess Grignard reagent was
precipitated from solution by adding Et2O and the suspension was filtered through Celite. The filtrate was hydrolyzed in ice-water and the mixture extracted with
Et2O(220 ml). The organic layer was dried over MgSO4, concentrated, filtered through a short column of neutral alumina (55 cm) and evaporated to dry-
ness. Reprecipitation from a mixture of MeOH and petroleum ether gave pure 1
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