In 2022,Roemer, Max; Gillespie, Angus; Jago, David; Costa-Milan, David; Alqahtani, Jehan; Hurtado-Gallego, Juan; Sadeghi, Hatef; Lambert, Colin J.; Spackman, Peter R.; Sobolev, Alexandre N.; Skelton, Brian W.; Grosjean, Arnaud; Walkey, Mark; Kampmann, Sven; Vezzoli, Andrea; Simpson, Peter V.; Massi, Massimiliano; Planje, Inco; Rubio-Bollinger, Gabino; Agrait, Nicolas; Higgins, Simon J.; Sangtarash, Sara; Piggott, Matthew J.; Nichols, Richard J.; Koutsantonis, George A. published an article in Journal of the American Chemical Society. The title of the article was 《2,7- and 4,9-Dialkynyldihydropyrene Molecular Switches: Syntheses, Properties, and Charge Transport in Single-Molecule Junctions》.SDS of cas: 15854-87-2 The author mentioned the following in the article:
This paper described the syntheses of several functionalized dihydropyrene (DHP) mol. switches with different substitution patterns. Regioselective nucleophilic alkylation of a 5-substituted di-Me isophthalate allowed the development of a workable synthetic protocol for the preparation of 2,7-alkyne-functionalized DHPs. Synthesis of DHPs with surface-anchoring groups in the 2,7- and 4,9-positions was described. The mol. structures of several intermediates and DHPs were elucidated by X-ray single-crystal diffraction. Mol. properties and switching capabilities of both types of DHPs were assessed by light irradiation experiments, spectroelectrochem., and cyclic voltammetry. Spectroelectrochem., in combination with d. functional theory (DFT) calculations, shows reversible electrochem. switching from the DHP forms to the cyclophanediene (CPD) forms. Charge-transport behavior was assessed in single-mol. scanning tunneling microscope (STM) break junctions, combined with d. functional theory-based quantum transport calculations All DHPs with surface-contacting groups form stable mol. junctions. Experiments showed that the mol. conductance depends on the substitution pattern of the DHP motif. The conductance was found to decrease with increasing applied bias. After reading the article, we found that the author used 4-Iodopyridine(cas: 15854-87-2SDS of cas: 15854-87-2)
4-Iodopyridine(cas: 15854-87-2) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. SDS of cas: 15854-87-2
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com