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Aluminum Complexes Based on Tridentate Amidoalkoxide NNO-Ligands: Synthesis, Structure, and Properties
- Source :
- Journal of Organometallic Chemistry. 875:11-23
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- A series of novel NNO-type ligands 12a-17a, LH2, R1N(CH2CH2NHTs)CHR2CR3R4OH (R1 = Bn, R3 = R4 = H; R2 = H (12a), R2= (S)-Ph (13a), R2= (S)-Bn (14a), R2= (S)-i-Bu (15a); R1 = R2= (R)-Me, R3 = H, R4= (S)-Ph (16a); R1 = Bn, R2= (S)-i-Bu, R3 = R4 = Ph (17a)) was obtained; the ligands LH2 feature various degree of substitution, steric bulkiness, and chirality. Treatment of 11a (R1 = Me, R2 = R3 = R4 = H), 12a-17a, and 18a (R1 = Me, R2 = H, R3 = R4 = Ph) with AlMe3 afforded the complexes 11b-18b, [LAlMe]n (n = 1, 2). It was demonstrated that the structure of the ligand determines the monomeric (16b-18b, R3, R4 = Ph) or dimeric (11b-15b, R3 = R4 = H) structure of the complexes. The discussion of the stereochemical consequences caused by dimerization and chirality of the ligands is performed. The molecular structures of dimeric 11b, 12b, 15b, and monomeric 17b were studied by single-crystal X-ray diffraction. Complexes 11b, 12b, 14b, and 17b are active initiators in ring-opening polymerization of l -lactide in the absence of alcohol. Furthermore, 11b-13b, 17b, and 18b demonstrate an outstanding catalytic activity and selectivity in alcoholysis of l -lactide to give (S,S)-methyl lactyllactate.
- Subjects :
- Steric effects
Lactide
010405 organic chemistry
Ligand
Stereochemistry
Organic Chemistry
010402 general chemistry
01 natural sciences
Biochemistry
0104 chemical sciences
Catalysis
Inorganic Chemistry
chemistry.chemical_compound
Monomer
chemistry
Polymerization
Materials Chemistry
Physical and Theoretical Chemistry
Chirality (chemistry)
Selectivity
Subjects
Details
- ISSN :
- 0022328X
- Volume :
- 875
- Database :
- OpenAIRE
- Journal :
- Journal of Organometallic Chemistry
- Accession number :
- edsair.doi...........867df3661c62ba1bfba496715b5fcde2