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Magnetic non-equivalence of methylene group protons in 1,2-disubstituted ferrocenes

✍ Scribed by G. Marr; R.E. Moore; B.W. Rockett

Publisher
Elsevier Science
Year
1968
Tongue
French
Weight
184 KB
Volume
9
Category
Article
ISSN
0040-4039

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✦ Synopsis

Continued interest in the origin of the magnetic non-equivalence of protons in methylene groups attached to asymmetric centres (1) prompts us tc report our results with some 1,2disubstituted ferrocenes.

Several factors, including molecular asymmetry (2)) 2-substituent asymmetry (3), unequal conformer populations resulting from steric hindrance (lc, 4), and solvent (la) and temperature effects (3) may contribute to the observed chemical shift differences between the methylene group protons.

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