Chiral auxiliaries in cycloadditions by Karola Rück-Braun, Horst Kunz

By Karola Rück-Braun, Horst Kunz

Because the days of Diels, Alder and Woodward, cycloadditions were one of the so much flexible reactions for stereoselective synthesis ... All correct details is accumulated during this well-structured, sensible guide. prepared in keeping with the cycloaddition sort, the fitting auxiliaries, reactants, stereoselectivities, yields, and references for every key response are compiled in compact tables. Scientists attracted to the theoretical historical past of stereoselective cycloadditions will locate an outstanding number of in-depth literature references. ... with this finished facts assortment cycloadditions turns into a good extra strong software for each natural chemist engaged on stereoselective synthesis.

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In the light of Kuratowski’s Theorem it is not surprising that many non-planar molecular graphs contain 3-rung Mobius ladders. What is perhaps a bit surprising is that a number of molecular graphs actually contain 4-rung Mobius ladders hidden in them. We illustrate this with the molecular graph of a ferrocenophane derivative [26] as well as the molecular graph of a Fe& cluster buried in a hydrocarbon environment [27]. On the left of Figure 35 is the molecular graph of a ferrocenophane derivative, while on the right is the same graph but with the vertices labeled to help us identify the 4-rung Mobius ladder.

Suppose that it is topologically achiral. 5 Molecular Mobius Ladders and Related Molecules 21 mation of the cell complex to its mirror image G* which necessarily takes each cell of the complex to a cell of the mirror image complex. The deformation must take any attaching vertex of a cell to an attaching vertex of a cell. Now within each cell of the complex, choose an arc going between the two attaching vertices of that cell. We shall refer to the mirror image of each arc of G as the corresponding arc of G*.

Compounds with M=Mn are also magnets, with critical temperatures of approximately 15 K when cat+ is a large cation (tetraethyl and n-tetrabutylammonium). They behave as metamagnets with long-range antifenomagnetic ordering in zero field around 15 K when cat+ is a small cation (alkali-metal ion or tetramethylammonium). 5 Structure of Molecule-Based Magnets Containing Three Spin Carriers, with a Fully Interlocked Structure In the preceding section we spoke about zero-, one-, and two-dimensional compounds.

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Chiral auxiliaries in cycloadditions by Karola Rück-Braun, Horst Kunz
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