Kessinger, Roland et al. published their research in Helvetica Chimica Acta in 2000

Optically active macrocyclic cis-3 bis-adducts of C₆₀: regio- and stereoselective synthesis, exciton chirality coupling, and determination of the absolute configuration, and first observation of exciton coupling between fullerene chromophores in a chiral environment was written by Kessinger, Roland;Thilgen, Carlo;Mordasini, Tiziana;Diederich, Francois. And the article was included in Helvetica Chimica Acta in 2000.HPLC of Formula: 57412-08-5 The following contents are mentioned in the article:

A series of optically active cis-3 bis-adducts was obtained regio- and diastereoselectively by Bingel macrocyclization of C₆₀ with bis-malonates, which contain optically active tethers derived from 1,2-diols. The absolute configuration of the inherently chiral addition pattern in cis-3 bis-adducts had previously been determined by comparison of calculated and exptl. CD spectra. Full confirmation of these earlier assignments was now obtained by an independent method based on semiempirical AM1 and OM2 calculations combined with ¹H-NMR spectroscopy. It was found computationally that bis-malonates [RCH(O₂CCH₂CO₂Et)]₂, which contain (R,R)- or (S,S)-butane-2,3-diol derivatives as optically active tethers, preferentially form out-out cis-3 bis-adducts of C₆₀ as a single diastereoisomer in which the alkyl groups R adopt a gauche conformation, while the two glycolic H-atoms are in an antiperiplanar (ap) and the ester linkages to the fullerene in a gauche relationship. In contrast, in the less favorable diastereoisomer, which should not form, the alkyl groups R adopt an ap and the H-atoms a gauche conformation, while the ester bridges to the fullerene remain, for geometric reasons, locked in a gauche conformation. According to the OM2 calculations, the geometry of the fully staggered tether in the free bis-malonates closely resembles the conformation of the tether fragment in the bis-adducts formed. These computational predictions were confirmed exptl. by the measurement of the coupling constant between the vicinal glycolic H-atoms in the ¹H-NMR spectrum. This conformational anal. was further supported by the regio- and diastereoselective synthesis of cis-3 bis-adducts from bis-malonates, including tethers derived from cyclic glycol units with a fixed gauche conformation of the alkyl residues R at the glycolic C-atoms. Thus, a bis-malonate of (R,R)-cyclohexane-1,2-diol provided exclusively cis-3 bis-adduct. Incorporation of a tether derived from Me 4,6-O,O-benzylidene-¦Á-D-glucopyranoside into the bis-malonate and Bingel macrocyclization diastereoselectively produced the cis-3 stereoisomer as the only macrocyclic bis-adduct. If the geometry of the alkyl groups R at the glycolic C-atoms of the tether component deviates from a gauche relationship, as in the case of tethers derived from exo cis- and trans-norbornane-2,3-diol or from trans-cyclopentane-1,2-diol, hardly any macrocyclic product is formed. The absolute configurations of the various optically active cis-3 bis-adducts were also assigned by comparison of their CD spectra, which are dominated by the chiroptical contributions of the inherently chiral fullerene chromophore. A strong chiral exciton coupling was observed for optically active macrocyclic cis-3 bis-adducts of C₆₀ with two appended 4-(dimethylamino)benzoate or meso-tetraphenylporphyrin chromophores. Chiral exciton coupling between two fullerene chromophores was observed for the first time in the CD spectrum of the threitol-bridged bis-fullerene. This study involved multiple reactions and reactants, such as 4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5HPLC of Formula: 57412-08-5).

4-(10,15,20-Tri-p-tolylporphyrin-5-yl)phenol (cas: 57412-08-5) belongs to catalyst ligands. The atoms and molecules used as ligands are almost always those that are capable of functioning as the electron-pair donor in the electron-pair bond (a coordinate covalent bond) formed with the metal atom. Precious metals and metal oxides on carrier materials are used in many industrial processes as heterogenous catalysts.HPLC of Formula: 57412-08-5

Referemce:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI