Proton uranocene substituent

Least Squares Regression Data for Alkyl Uranocene Substituent Proton Data vs T ... 

E. H NMR of Substituted Uranocenes. Table VIII summarizes the chemical shifts relative to TMS for a number of uranocenes at a common temperature (30°C). The results are summarized for ring and substituent protons for convenience. 

In fact, studies of a number of substituent protons in substituted uranocenes provide linear correlations with (54). 

We can now return to our conclusion in the last section where we deduced from the pattern of ring proton resonances and from steric considerations that t-butyl substituents in uranocenes must be tilted away from uranium. This argument does not apply to the neopentyl group which is a normal primary alkyl substituent for which the ring-CH2 bond can be tilted towards uranium without difficulty. 

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