Mass Spectra of (m)(n)Ferrocenophanes and (m)(n)Ferrocenophanones

摘要

A mass spectrometric study of six mono- and fourteen di-bridged ferrocenes ((m)(n)-ferrocenophanes and (m)(n)ferrocenophanones) has been made. Ten of the compounds have ketone functionality on their alkyl bridges, with the remaining molecules having completely saturated alkyl bridges. The molecular ion is the base peak in all twenty compounds. With the exception of (4)ferrocenophan-2-one, (3)(4)-1,3-ferrocenophan-2-one, and (4)(4)-1,3-ferrocenophan-2-one, the spectra show no fragment ions with relative intensities greater than 20 percent. A trend in the series indicates that bonds joining bridges to the ferrocene nucleus resist cleavage. There is evidence that fragmentation patterns attributed to bond rupture within the alkyl bridges can be affected by either conformational restraints or strain imposed by a second alkyl bridge in the molecule. (Author)