Synthesis of a New Dicompartment Multifunctional Groups Ligand

Abstract

Phenol‐based acyclic ligand 1,6‐bis(2‐chlorobenzyl)‐2,5‐bis(2‐hydroxy‐3‐formyl‐5‐methylbenzyl)‐2,5‐diazahexane, LH2 and its dilithium form Li2L possessing two dissimilar compartments having multifunctional groups were prepared through a Mannich reaction. To synthesize this ligand first, diamine compound 1,6‐bis(2‐chlorobenzyl)‐2,5‐diazahexane was prepared and then in a one‐step procedure an equivalent of diamine and two equivalents of 4‐methyl‐2‐formylphenol in the presence of an excess amount para‐formaldehyde were reacted. All characterization data for the new compounds including diimine, diamine, LH2 and Li2L are reported.

Copper‐Catalyzed Amidation of Aryl Iodides in the Presence of Various Chelating Ligands

“…For the synthesis of ligands we have first reacted one equivalent of ethylenediamine and two equivalents of aldehydes (1a-f) in ethanol at room temperature according to a reported method 17 to result in crystalline diimine compounds (2a-f) in very good yields. These compounds are sufficiently pure for further treatment.…”

“…The bidentate ligands were prepared according to a published procedure. 17 A typical experimental procedure was as follows: to a stirred solution of amides (1 mmol) and aryl iodides (2 mmol) in toluene (8 mL) under argon atmosphere were added CuI (15 mg, 7.5 mol%) and N,N¢-dibenzylethylenediamine (18 mg, 7.5 mol%) followed by KF/Al 2 O 3 13 (5 equivalents, 780 mg) and stirred at 110°C for specified times ( Table 2). The progress of the reaction was monitored by TLC.…”

Synthesis and characterization of mono- and heterodinuclear complexes with dicompartmental macrocyclic ligand containing hexa- and pentadentate coordination sites

“…Phenol based binucleating ligands containing two different compartments have particularly received great attention due to their capability to bind two different metal centers in close proximity [4][5][6][7][8][9][10][11][12][13]. Since unsymmetrical dicompartmental ligands are of importance for providing discrete heterodinuclear core complexes, various types of compartmental ligands type A (in Chart 1) have been prepared, and their structures and reactivities were investigated by Bosnich [9][10][11], Busch [7], and us [4][5][6]. Such ligands contain two compartments: one includes six coordination atoms (N 4 O 2 ), and the other with a tetradentate N 2 O 2 donor set.…”