By C. Schalley
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Additional info for Analytical Methods in Supramolecular Chem. [2 vols]
Int. , 43, 1291. F. I. (2003) Angew. , 115, 802; (2003) Angew. Chem. Int. , 42, 778. Anderson, S. L. Templates in Organic Synthesis: Deﬁnitions and Roles, in Ref. 34e,. -P. and Dietrich-Buchecker, C. (eds) (1999) Molecular Catenanes, Rotaxanes, and Knots, Wiley-VCH Verlag GmbH, Weinheim. -P. (1990) Acc. Chem. Y. (2001) Angew. , 113, 1586; (2001) Angew. Chem. Int. -P. (2003) J. Am. Chem. , 125, 2016. (a) Diederich, F. (1990) J. Chem. , and Tonellato, U. (1992) J. Phys. Org. -M. (1994) Appl. Catal.
Instead, much simpler mechanisms must have existed in the early world. In order to ﬁnd an answer, several research groups provided evidence that short DNA oligomers are indeed able to self-replicate in the presence of the appropriate template . Later, suitable α-helical peptides were also shown to self-replicate . 5 A minimal self-replicating system. In the presence of template A, the two reactands on the left are organized in a way suitable for a 1,3-dipolar cycloaddition reaction. The pyridineamide part of the template recognizes the acid substituent in the N O B reactand, while the second reactand is recognized by the carboxylic acid incorporated in the template.
Such a positional switch was realized by Leigh et al. The idea was to introduce three binding sites located on a larger ring, and the ability to control the afﬁnity of a smaller wheel to the individual stations sequentially, to move the smaller wheel in discrete steps between these binding sites in one direction. In fact, the small ring in this catenane moves with high positional integrity but without control over its direction of motion. Only with the implementation of a fourth binding site and the use of a second smaller wheel, was a unidirectional motion around the larger ring induced, since the two rings in the catenane mutually block each other’s movement to ensure an overall stimuli .