By Scott E. Denmark
Issues in Stereochemistry covers the basic rules of actual chemistry and molecular physics whereas facing definite stereochemical features of natural chemistry and biochemistry.
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Extra resources for Topics in Stereochemistry, Volume 23
Sample text
4). e. ≥97%. 124,130 This synthetic approach allows a precise positioning of chromophores or receptor sites in close proximity to the fullerene surface, thus offering the possibility for changes in the physical properties of the carbon cage. It was exploited in macrocyclic fullerene-porphyrin dyads with the trans-1131 or the inherently chiral trans-2132 addition pattern. 16),133 synthesized by using the self-assembly strategy of Stoddart and co-workers,134 the handedness results from an element of planar chirality represented by the doubly para-bridged hydroquinone ring of the [34]crown-10 macrocycle.
CARLO THILGEN, ISABELLE GOSSE, AND FRANCOIS ¸ DIEDERICH 25 purified by chromatography on an achiral stationary phase. Similarly, starting from the according (S,S)-configured bis-adducts (S,S)-21 and (S,S)-22, f and (S,S,f C)-24 the formed diastereoisomeric e,e,e tris-adducts (S,S,A)-23 can each be isolated. 1), they include two f f and (R,R,A)diastereoisomeric pairs of enantiomers ((R,R,f C)-23/(S,S,A)-23 f 96 24/(S,S, C)-24). 1) show that compounds having addition patterns of matching constitution and configuration give rise to (nearly) identical CD bands, regardless of the constitution or the configuration of the addends.
O EtO O O O O O O O OEt O (±)- 41 (cis-2,cis-2,trans-3, C 2) Synthesis of a chiral tris-adduct of C60 by double tether-directed Bingel macrocy- (±)-41 strongly suggests the presence of an inherently chiral cis-2,cis-2,trans-3 addition pattern. 18). 18 As opposed to Euclidean enantiomers, topological enantiomers cannot be interconverted by a continuous deformation in three-dimensional space without breaking a bond. 17). 17. The four classical stereoisomers of a CTV-C60 tris-adduct conjugate with an e,e,e addition pattern, and their planar representations.