87022-53-5Relevant academic research and scientific papers
Self-Assembling [ n. n]Paracyclophanes: A Structure-Property Relationship Study
Abboud, Khalil A.,Castellano, Ronald K.,Fagnani, Danielle E.,Henderson, Will R.,Liu, Guancen,Zhu, Yu
, (2020)
Reported here is the synthesis, characterization, and isodesmic supramolecular polymerization of [3.3]paracyclophane-5,8,14,17-tetracarboxamide ([3.3]pCpTA). The self-assembling monomer, a bridge-expanded homolog of [2.2]paracyclophane-4,7,12,15-tetracarboxamide ([2.2]pCpTA), forms homochiral assemblies in nonpolar solution and the solid state through double-helical intermolecular and transannular hydrogen bonding. The additional methylene unit in the [3.3]paracyclophane bridge results in a weakened supramolecular assembly for [3.3]pCpTA compared to [2.2]pCpTA in solution. Likely origins of the change in assembly strength, revealed through X-ray crystallography, computational analysis, and solution-phase spectroscopy, are an increase in (a) the intramolecular and intermolecular deck-to-deck spacing compared to [2.2]paracyclophane resulting from larger amide dihedral angles accompanying transannular hydrogen bonding in the [3.3]paracyclophane and (b) monomer entropy associated with the scissoring motion of the [3.3]paracyclophane bridge.
Synthesis of n> Cyclophanes and Related Compounds by Alkylation of Tosylmethyl Isocyanide with Bis(bromoethyl)benzenes
Sasaki, Hideaki,Kitagawa, Tokujiro
, p. 2868 - 2878 (2007/10/02)
Bis(2-isocyano-2-tosylethyl)benzenes (12a, 12b, and 12c), synthesized by the reaction of tosylmethyl isocyanide (7) with bis(bromomethyl)benzenes (11a, 11b, and 11c) in 2:1 molar ratio, reacted again with 11a, 11b, and 11c under phase-transfer conditions
