(a) In 1956, it was concluded on the basis of dipole moment measurements that Cp2Pb did not contain coparallel C5-rings. Explain how this conclusion follows from such measurements.
(b) X-ray diffraction studies at 113 K show that two cyclopentadienyl complexes of beryllium can be formulated as (η:5-C5HMe4)(η1-C5HMe4)Be and (η5-C5Me5)2Be respectively. The solution 'hi NMR spectrum at 298K of (C5HMe4)2Be exhibits singlets at 6 1.80, 1.83 and 4.39 ppm (relative integrals 6:6:1), whereas that of (C5Me5)2Be shows one singlet at 6 1.83 ppm. Draw diagrams to represent the solid state structures of the compounds and rationalize the solution NMR spectroscopic data.
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