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demonstrated that chelating thiolates can support an oligomeric array in which the metal atoms, although possessing essentially the same immediate coordination geometry, are rendered inequivalent by the chelate arrangement. This consideration should not be ignored in any interpretation of the spectroscopic in-equivalence30 of the metal centers of the metallothioneins and related proteins.Acknowledgment. We thank S. Bristow for his considerable assistance and expertise in the recording and assignment of 13C NMR spectra and the SERC for financial support (to J.R.N. and I.L.A.). 94957-37-6. Supplementary Material Available: Listings of all the calculated atomic coordinates, anisotropic thermal parameters, isotropic thermal parameters for hydrogen atoms, remaining bond lengths and bond angles, and |F0| and |FC| values (40 pages). Ordering information is given on any current masthead page.

Reduction of 3,4-Diacetoxydibenz[a,/i Janthracene (51). w Reaction of 51® (79 mg, 0.2 mmol) with NaBH4 (200 mg) in ethanol (15 mL) under air for 70 h yielded after recrystallization from THF trans-dihydro diol 41, 44 mg (70%).