1355451-45-4Relevant academic research and scientific papers
Reactions of {TiO(salen)}n [salen = N,N′-bis(salicylidene) ethylenediamine] in aromatic aldehydes and ketones
Nielson, Alastair J.,Telfer, Shane G.,Waters, Joyce M.
, p. 97 - 106 (2012/03/09)
Polymeric {TiO(salen)}n prepared from [Ti(OCHMe 2)2(acac)2] and salen-H2 in MeOH and with an apparent chain structure, is mostly insoluble but dissolves when strongly heated in aromatic aldehydes or ketones, depositing the insoluble form again on cooling. p-Tolualdehyde performed differently, giving a red solution from which insoluble red crystals were deposited. X-ray crystallography showed the complex was [{Ti(salen)(O2CC6H4Me-4)-O- Ti(salen)(O2CC6H4Me-4)]. Solvent (1) (solvent = p-tolualdehyde or p-toluic acid) containing a Ti-O-Ti bridge. Reaction of {TiO(salen)}n with p-tert-butylbenzoic acid in the presence of excess p-tolualdehyde gave [{Ti(salen)(O2CC6H 4CMe3-4)-O-Ti(salen)(O2CC6H 4CMe3-4) ]. 4-CH3C6H4CHO (2) for which an X-ray crystal structure determination indicated similar connectivity around the metal as for (1). {TiO(salen)}n heated strongly in isobutyrophenone (PhCOCHMe2) also gave red crystals which X-ray analysis showed structural similarity to (1) and (2) but incorporating a PhCO2-ligand. {TiO(salen)}n heated in acetophenone gave a product which X-ray analysis showed was a dioxo-bridged dimer (4) in which C-C bond formation had occurred on one side of each salen ligand.
