1207879-56-8

Basic information

• Product Name: N,N′-bis-(3,5-di-tert-butylsalicylidene)-2,2′-diaminodiphenyl ether
• Synonyms: N,N′-bis-(3,5-di-tert-butylsalicylidene)-2,2′-diaminodiphenyl ether
• CAS NO: 1207879-56-8
• Molecular Weight: 632.886
• Mol File: 1207879-56-8.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: N,N′-bis-(3,5-di-tert-butylsalicylidene)-2,2′-diaminodiphenyl ether(CAS DataBase Reference)
• NIST Chemistry Reference: N,N′-bis-(3,5-di-tert-butylsalicylidene)-2,2′-diaminodiphenyl ether(1207879-56-8)
• EPA Substance Registry System: N,N′-bis-(3,5-di-tert-butylsalicylidene)-2,2′-diaminodiphenyl ether(1207879-56-8)

Safety Data

• Hazardous Substances Data: 1207879-56-8(Hazardous Substances Data)

Upstream product

• 37942-07-7 3,5-di-tert-butyl-2-hydroxybenzaldehyde 
• 24878-25-9 bis(2-aminophenyl)ether 

Relevant articles and documents

Synthesis and characterization of rare-earth metal complexes supported by a new pentadentate Schiff base and their application in heteroselective polymerization of rac-lactide

A series of neutral rare-earth metal aryloxides and amides supported by a new pentadentate (N2O3) salen ligand were synthesized, and their catalytic behaviors for the ring-opening polymerization of rac-lactide (rac-LA) were explored. The protolysis reactions of N,N′-bis(3,5-di-tert-butylsalicylidene)-2,2′-diaminodiphenyl ether (LH2) with (ArO)3Ln(THF) (ArO = 2,6-But2-4-MeC6H2O) and Ln[N(SiMe3)2]3 in a 1:1 molar ratio in THF gave the neutral rare-earth metal aryloxides LLn(OAr)(THF)n [n = 0, Ln = Sc (1), Yb (2); n = 1, Ln = Y (3), Sm (4) and Nd (5)] and rare-earth metal amides LLnN(SiMe3)2 [Ln = Yb (6), Y (7)], respectively. X-ray structural determination showed that complexes 1, 2, 6 and 7 have monomeric structures, in which the coordination geometry around the rare-earth metal atom can be best described as a distorted trigonal prism. Complexes 3 and 5 are THF-solvated monomers and each of the rare-earth metal atoms is seven-coordinated to form a distorted capped trigonal prism. It was found that all of these complexes can efficiently initiate the ring-opening polymerization (ROP) of rac-LA to give heterotactic-rich polylactides (PLAs). The highly heterotactic PLA (Pr up to 0.93) was obtained using complex 2 as the initiator at a polymerization temperature of 0 °C. The observed increasing order of activity of 1 2 3 4 ≈ 5 is in agreement with the order of their ionic radii, whereas the order of stereoselectivity is in the reverse order. The rare-earth metal salen amides can initiate rac-LA polymerization in a controlled manner, while polymerization using the rare-earth metal salen aryloxides is less controlled at room temperature.