Magnesium atoms alkanes

Typically, attempts to synthesize 1,2-di-Grignard reagents from 1,2-dihaloalkanes fail, because metal halide elimination after insertion of the first magnesium atom is faster than formation of a second magnesium-carbon bond. The only l,2-di(halomagnesio)alkane [16] synthesized in the classic fashion is a l,2-di(bromomagnesio)cyclopropane 22 [Eq. 

The paramagnetic oxygen ions 0 , 01> and 0J have been formed on magnesium oxide and studied by EPR spectroscopy. The reactivity of these ions with hydrocarbons follows the sequence 0 >>03> >02. Both with alkanes and alkenes the initial reaction is thought to be hydrogen atom abstraction. 

Instead of the dioxygen-reductant pair, one can employ oxo componds containing an oxygen atom which is already partly reduced H2O2 [68], ROOH [69], PhIO [70], NaOCl [71], KHSO. [72], amine Af-oxides [73], and magnesium monoperoxyphtalate [74] (see also Chapter X). One of the most efficient (in terms of reaction rate and turnover number) systems is the combination of ruthenium porphyrin and 2,6-dichloropyridine A-oxide [73]. A simplified mechanism of alkane oxidation with iodosylbenzene catalyzed by iron porphyrinate is demonstrated in Scheme XI. 17. 

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