Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization

J. C.-C. Yu; P. V. Lagaditis; I. R. Duffy; I. Yu; K. M. Osten; Christopher Wallis; P. Mehrkhodavandi

doi:10.1039/C2DT30148B

Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization

J. C.-C. Yu, P. V. Lagaditis, I. R. Duffy, I. Yu, K. M. Osten, Christopher Wallis, P. Mehrkhodavandi

Research output: Contribution to journal › Article › peer-review

Abstract

Functionalized diaminophenols, H(NR1R2R1R2R1R2R1R2R1R2R1R2R1R2R1R2NR3R3R3R3R3R3R3R3O), were investigated as ligands for indium catalysts in the ring-opening polymerization of racemic lactide. Precursor complexes (NMe2NMeO)InCl2 (1), (NPr2NO)InCl2 (2), and (NMesNO)InCl2 (3) were synthesized and fully characterized by 1H and 13C NMR spectroscopy, elemental analysis, and single-crystal X-ray crystallography. Complexes 1 and 2 were used to synthesize alkoxy-bridged complexes [(NMe2NMeO)InCl]2(μ-Cl)(μ-OEt) (4) and [(NPr2NO)InCl]2(μ-Cl)(μ-OEt) (5). These complexes catalysed the polymerization of racemic lactide at different rates, with complex 5 being substantially more active than complex 4. The dissociation behaviour of these catalysts in the presence of lactide was also studied and used to make comparisons with previously reported catalyst systems.

Original language	English
Pages (from-to)	8123-8134
Journal	Dalton Transactions
Issue number	26
DOIs	https://doi.org/10.1039/C2DT30148B
Publication status	Published - 8 Mar 2012
Externally published	Yes

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10.1039/C2DT30148B

Cite this

@article{b8dc06d17e6c490d8c557b919adf3e23,

title = "Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization",

abstract = "Functionalized diaminophenols, H(NR1R2R1R2R1R2R1R2R1R2R1R2R1R2R1R2NR3R3R3R3R3R3R3R3O), were investigated as ligands for indium catalysts in the ring-opening polymerization of racemic lactide. Precursor complexes (NMe2NMeO)InCl2 (1), (NPr2NO)InCl2 (2), and (NMesNO)InCl2 (3) were synthesized and fully characterized by 1H and 13C NMR spectroscopy, elemental analysis, and single-crystal X-ray crystallography. Complexes 1 and 2 were used to synthesize alkoxy-bridged complexes [(NMe2NMeO)InCl]2(μ-Cl)(μ-OEt) (4) and [(NPr2NO)InCl]2(μ-Cl)(μ-OEt) (5). These complexes catalysed the polymerization of racemic lactide at different rates, with complex 5 being substantially more active than complex 4. The dissociation behaviour of these catalysts in the presence of lactide was also studied and used to make comparisons with previously reported catalyst systems.",

author = "{J. C.-C. Yu} and {P. V. Lagaditis} and {I. R. Duffy} and {I. Yu} and {K. M. Osten} and Christopher Wallis and {P. Mehrkhodavandi}",

year = "2012",

month = mar,

day = "8",

doi = "10.1039/C2DT30148B",

language = "English",

pages = "8123--8134",

journal = "Dalton Transactions",

issn = "1477-9226",

publisher = "Royal Society of Chemistry (RSC)",

number = "26",

}

TY - JOUR

T1 - Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization

AU - J. C.-C. Yu

AU - P. V. Lagaditis

AU - I. R. Duffy

AU - I. Yu

AU - K. M. Osten

AU - Wallis, Christopher

AU - P. Mehrkhodavandi

PY - 2012/3/8

Y1 - 2012/3/8

N2 - Functionalized diaminophenols, H(NR1R2R1R2R1R2R1R2R1R2R1R2R1R2R1R2NR3R3R3R3R3R3R3R3O), were investigated as ligands for indium catalysts in the ring-opening polymerization of racemic lactide. Precursor complexes (NMe2NMeO)InCl2 (1), (NPr2NO)InCl2 (2), and (NMesNO)InCl2 (3) were synthesized and fully characterized by 1H and 13C NMR spectroscopy, elemental analysis, and single-crystal X-ray crystallography. Complexes 1 and 2 were used to synthesize alkoxy-bridged complexes [(NMe2NMeO)InCl]2(μ-Cl)(μ-OEt) (4) and [(NPr2NO)InCl]2(μ-Cl)(μ-OEt) (5). These complexes catalysed the polymerization of racemic lactide at different rates, with complex 5 being substantially more active than complex 4. The dissociation behaviour of these catalysts in the presence of lactide was also studied and used to make comparisons with previously reported catalyst systems.

AB - Functionalized diaminophenols, H(NR1R2R1R2R1R2R1R2R1R2R1R2R1R2R1R2NR3R3R3R3R3R3R3R3O), were investigated as ligands for indium catalysts in the ring-opening polymerization of racemic lactide. Precursor complexes (NMe2NMeO)InCl2 (1), (NPr2NO)InCl2 (2), and (NMesNO)InCl2 (3) were synthesized and fully characterized by 1H and 13C NMR spectroscopy, elemental analysis, and single-crystal X-ray crystallography. Complexes 1 and 2 were used to synthesize alkoxy-bridged complexes [(NMe2NMeO)InCl]2(μ-Cl)(μ-OEt) (4) and [(NPr2NO)InCl]2(μ-Cl)(μ-OEt) (5). These complexes catalysed the polymerization of racemic lactide at different rates, with complex 5 being substantially more active than complex 4. The dissociation behaviour of these catalysts in the presence of lactide was also studied and used to make comparisons with previously reported catalyst systems.

U2 - 10.1039/C2DT30148B

DO - 10.1039/C2DT30148B

M3 - Article

SN - 1477-9226

SP - 8123

EP - 8134

JO - Dalton Transactions

JF - Dalton Transactions

IS - 26

ER -