Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， category: catalyst-ligand, Which mentioned a new discovery about 20439-47-8
A series of novel C-5 arylated calixsalens synthesized via [3+3] cyclocondensation of trans-(R,R)-1,2-diaminocyclohexane with 2-hydroxyisophthalaldehyde derivatives are presented. The nonsymmetrical aryl substituents of the 1-naphthyl type may act as switches opening (ON conformation) or closing (OFF conformation) the macrocycle cavity. This group of macrocycles, depending on the kind of aryl substituent, is characterized by a large variety of supramolecular architectures. Whereas the substitution of the calixsalen skeleton by 2,5-dimethoxybenzene groups promotes the formation of head-to-head capsules, the presence of a 3,5-dimethylbenzene group favors the tail-to-tail dimers. Introduction of 2-naphthyl substituents, in turn, results in the formation of a supramolecule consisting of four monomers that exists only in the solid state. Such arrangements of macrocycles generate a truncated tetrahedron shaped cavity never previously observed for this type of macrocyclic compounds.
Because enzymes can increase reaction rates by enormous factors and tend to be very specific, category: catalyst-ligand, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 20439-47-8
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI