Abstract

The acyl derivatives of 3,3′,4,4′-tetramethyldi- phosphaferrocene (TMDPF) have been examined in strong acids by 57Fe Mössbauer, 1H and 31P NMR spectroscopy. As with ferrocenyl ketones, protonation was found to occur at the keto function, the diphosphaferrocenyl ketones having comparable or, in some cases, reduced basicities compared to ferrocenyl ketones. [p ]Trends in the 57Fe Mössbauer parameters are not as additive as in ferrocene systems due to steric crowding. The keto derivatives show some unusual deuteriation patterns and these have been compared with those of ferrocenyl ketones. The 13C spectra of several derivatives have been reported to illustrate the rather complex stereochemistry found in these derivatives.

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