Abstract
Abstract The mass spectra of π-RC5H4Re(CO)2XY (R = H, CH3 COOCH3, X, Y = H, CH3, COCH3, Br, I, HgCl) have been studied. A successive expulsion of carbonyl groups, a common fragmentation path for cyclopentadienyl metal carbonyls, is observed in addition to the parallel elimination of substituents X and Y from the molecular ions of seven-coordinate rhenium complexes. Loss of a hydrogen molecule from the [M 2CO]+ ion is a characteristic of the fragmentation of σ-methyl complexes.
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