Application In Synthesis of Picolinoyl chloride hydrochloride. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Picolinoyl chloride hydrochloride, is researched, Molecular C6H5Cl2NO, CAS is 39901-94-5, about Hydroxy-substituted azacalix[4]pyridines: synthesis, structure, and construction of functional architectures.
A number of hydroxyl-substituted azacalix[4]pyridines I (R1 = OH, R2 = R3 = R4 = H; R1 = R3 = OH, R2 = R4 = H; R1 = R2 = R3 = R4 = OH, etc.) were synthesized using Pd-catalyzed macrocyclic ”2 + 2” and ”3 + 1”; coupling methods and the protection-deprotection strategy of hydroxyl group. While the conformation of the these hydroxyl-substituted azacalix[4]pyridines I is fluxional in solution, in the solid state, they adopted shape-persistent 1,3-alternate conformations. Besides, X-ray anal. revealed that the existence of hydroxy groups on the para-position of pyridine facilitated the formation of solvent-bridged intermol. hydrogen bonding for mono-hydroxyl-substituted compound while partial tautomerization for four-hydroxyl-substituted macrocycles, resp. Taking the hydroxyl-substituted azacalix[4]pyridines I as mol. platforms, multi-macrocycle-containing architectures and functional building blocks were constructed. The self-assembly behavior of the resulting building blocks was investigated in crystalline state.
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