Activating Unreactive Substrates The Role of Secondary by ed. by Martin Hiersemann

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2001) Angewandte Chemie – International Edition, 40, 4271–4274. 34 (a) Breslow, R. (1995) Accounts of Chemical Research, 28, 146–153. (b) Breslow, R. and Dong, S. Chem. , (1998) 98, 1997–2011. -N. Giorgi, M. and Reinaud, O. (2001) Journal of the American Chemical Society, 123, 8442–8443. , Goetz, S. and McKee, V. (2002) Angewandte Chemie – International Edition, 41, 4553–4556. J. J. (2000) Coordination Chemistry Reviews, 200–202, 443–485. 38 Kersting, B. (2004) Zeitschrift fur Anorganische und Allgemeine Chemie, 630, 765–780.

Secondary IHB interactions of zinc-coordinated substrates to proton donors of the enzyme such as the guanidinium group of arginine or the imidazolium group of histidine are important parts of an H-bond network that can serve as a proton relay. Numerous biomimetic carbonato and hydrogencarbonato complexes of zinc were structurally characterized [38]. We became interested in investigating the performance of NHfunctional guanidine ligands in the stabilization of mono- and dinuclear complexes with ZnÀOH, ZnÀOCOOH, ZnÀOCOOÀZn and ZnÀOÀZn functionalities.

2). 7). 7 Fixation of CO2 and cis-bromination of a,b-unsaturated carboxylate ligands. Recently, it has been found that the outcome of some cycloadditions can be altered remarkably when they are performed inside the cavity of cyclodextrines [70], selfassembled molecular capsules [71], or coordination cages [72]. This fact intrigued us greatly and awoke our interest in the Diels–Alder reactivity of the ‘calixarene-like’ [M2L2(L0 )] þ complexes bearing unsaturated carboxylate coligands L0 [43]. The results are discussed in more detail.

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