205697-94-5

Basic information

• Product Name: [p-Bu(t)-calix[4]-(OMe)(O)3Ti(p-MeC₆H₄)]
• CAS NO: 205697-94-5
• Molecular Weight: 798.942
• Mol File: 205697-94-5.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: [p-Bu(t)-calix[4]-(OMe)(O)3Ti(p-MeC₆H₄)](CAS DataBase Reference)
• NIST Chemistry Reference: [p-Bu(t)-calix[4]-(OMe)(O)3Ti(p-MeC₆H₄)](205697-94-5)
• EPA Substance Registry System: [p-Bu(t)-calix[4]-(OMe)(O)3Ti(p-MeC₆H₄)](205697-94-5)

Safety Data

• Hazardous Substances Data: 205697-94-5(Hazardous Substances Data)

Upstream product

• 122406-45-5 24,26-dimethoxy-25,27-dihydroxy-5,11,17,23-tetra(4-tert-butyl)calix[4]arene 
• 205697-84-3 [p-Bu(t)-calix[4]-(OMe)2(O)2TiCl] * C₆H₆ 
• 2417-95-0 p-tolyllithium 

Relevant articles and documents

Titanium-carbon functionalities on an oxo surface defined by a calix[4]arene moiety and its redox chemistry

Lithiation of [p-But-calix[4]-(OMe)2(OH)2] (1), followed by reaction with TiCl3(thf)3 or TiCl4(thf)2, led to the corresponding titanium-calix[4]arene complexes [p-But-calix[4]-(OMe)2(O)2TiCl] (2) and [p-But-calix[4]-(OMe)2(O)2TiCl2] (3), respectively. Reaction of 1 with TiCl4(thf)2 results in demethylation of the calix[4]arene and the obtention of [p-But-calix[4]-(OMe) (O)3TiCl] (4), whose hydrolysis led to [p-But-calix[4]-(OMe) (OH)3] (6). The preparation of 6 can be carried out as a one-pot synthesis. Both 2 and 4 undergo alkylation reactions using conventional procedures, thus forming surprisingly stable organometallic species, namely [p-But-calix[4]-(OMe)2-(O)2Ti(R)] (R=Me (7); CH2Ph (8), p-MeC6H4 (9)) and [p-But-calix[4]-(OMe) (O)3Ti(R)] (R=Me (10); CH2Ph (11); p-MeC6H4 (12)). Complexes 7 and 9 undergo a thermal oxidative conversion into 10 and 12, occurring with the demethylation of one of the methoxy groups. A solid state structural property of 9 and 12 has been revealed by X-ray analysis showing a self-assembly of the monomeric units into a columnar polymer, where the p-toly1 substituent at the metal functions as a guest group for an adjacent titanium-calixarene. Reductive alkylation of 3 with Mg(CH2Ph)2 gave 8 instead of forming the corresponding dialkyl derivative. Two synthetic routes have been devised for the synthesis of the Ti(III)-Ti(III) dimer [p-But-calix[4]-(OMe) (O)3Ti]2 (13): the reduction of 4 and the reaction of TiCl3(thf)3 with the lithiated form of 6. A very strong antiferromagnetic coupling is responsible for the peculiar magnetic behavior of 13. The proposed structures have been supported by the X-ray analyses of 4, 9, 12 and 13