(a) In 1956, it was concluded on the basis of dipole moment measurements that Cp 2 Pb...
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(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 113K show that two cyclopentadienyl complexes of beryllium can be formulated as (η5-C5HMe4)(kC1-C5HMe4)Be and (η5-C5Me5)2Be respectively. The solution1H NMR spectrum at 298K of (C5HMe4)2Be exhibits singlets at δ 1.80, 1.83 and 4.39 ppm (relative integrals 6 :6 : 1), whereas that of (C5Me5)2Be shows one singlet at δ 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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