Iminophosphorane Mediated Imine Metathesis
The iminophosphorane Cl3PNAr (1a, Ar = 2-fluorophenyl) reacts metathetically with imines at 80 °C to produce NR exchange products. Compound 1a effectively catalyzes imine/imine and imine/carbodiimide cross-metathesis. The observation of NR exchange products as well as spectroscopic evidence for t...
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Published in | Inorganic chemistry Vol. 42; no. 11; pp. 3438 - 3444 |
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Main Authors | , |
Format | Journal Article |
Language | English |
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United States
American Chemical Society
02.06.2003
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Abstract | The iminophosphorane Cl3PNAr (1a, Ar = 2-fluorophenyl) reacts metathetically with imines at 80 °C to produce NR exchange products. Compound 1a effectively catalyzes imine/imine and imine/carbodiimide cross-metathesis. The observation of NR exchange products as well as spectroscopic evidence for the existence of diazaphosphetidine type intermediates suggests that a [2 + 2] addition/elimination mechanism is the primary pathway for substrates with N-alkyl substituents and a secondary pathway for N-aryl imines. In contrast to previously studied carbodiimide systems, the resting state of the catalyst is the iminophosphorane and not the diazaphosphetidine. For N-aryl imines, Lewis-acid catalysis appears to be the dominant mechanism, not addition/elimination. For N-alkyl imines, a decomposition pathway, involving HCl elimination from a phosphorus intermediate, is competitive in some cases. |
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AbstractList | The iminophosphorane Cl(3)P[double bond]NAr (1a, Ar = 2-fluorophenyl) reacts metathetically with imines at 80 degrees C to produce [double bond]NR exchange products. Compound 1a effectively catalyzes imine/imine and imine/carbodiimide cross-metathesis. The observation of [double bond]NR exchange products as well as spectroscopic evidence for the existence of diazaphosphetidine type intermediates suggests that a [2 + 2] addition/elimination mechanism is the primary pathway for substrates with N-alkyl substituents and a secondary pathway for N-aryl imines. In contrast to previously studied carbodiimide systems, the resting state of the catalyst is the iminophosphorane and not the diazaphosphetidine. For N-aryl imines, Lewis-acid catalysis appears to be the dominant mechanism, not addition/elimination. For N-alkyl imines, a decomposition pathway, involving HCl elimination from a phosphorus intermediate, is competitive in some cases. The iminophosphorane Cl3PNAr (1a, Ar = 2-fluorophenyl) reacts metathetically with imines at 80 °C to produce NR exchange products. Compound 1a effectively catalyzes imine/imine and imine/carbodiimide cross-metathesis. The observation of NR exchange products as well as spectroscopic evidence for the existence of diazaphosphetidine type intermediates suggests that a [2 + 2] addition/elimination mechanism is the primary pathway for substrates with N-alkyl substituents and a secondary pathway for N-aryl imines. In contrast to previously studied carbodiimide systems, the resting state of the catalyst is the iminophosphorane and not the diazaphosphetidine. For N-aryl imines, Lewis-acid catalysis appears to be the dominant mechanism, not addition/elimination. For N-alkyl imines, a decomposition pathway, involving HCl elimination from a phosphorus intermediate, is competitive in some cases. |
Author | Burland, Matthew C Meyer, Tara Y |
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Cites_doi | 10.1021/om9708889 10.1021/om011085v 10.1021/om011086n 10.1002/zaac.19663430307 |
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References | Blackwell J. M. (ic0263138b00012/ic0263138b00012_1) 2002; 21 ic0263138b00001/ic0263138b00001_1 Meyer K. E. (ic0263138b00004/ic0263138b00004_1) 1994; 116 Bell S. A. (ic0263138b00007/ic0263138b00007_1) 2002; 124 Becke-Goehring M. (ic0263138b00010/ic0263138b00010_1) 1966; 343 Cantrell G. K. (ic0263138b00003/ic0263138b00003_1) 1997; 16 Bell S. A. (ic0263138b00008/ic0263138b00008_1) 2000; 1375 Jordan R. F. (ic0263138b00005/ic0263138b00005_1) 1997; 119 Johnson A. (ic0263138b00006/ic0263138b00006_1) 1993 Burland M. C. (ic0263138b00002/ic0263138b00002_1) 2002; 21 Toth G. (ic0263138b00013/ic0263138b00013_1) 1974; 9 |
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Snippet | The iminophosphorane Cl3PNAr (1a, Ar = 2-fluorophenyl) reacts metathetically with imines at 80 °C to produce NR exchange products. Compound 1a effectively... The iminophosphorane Cl(3)P[double bond]NAr (1a, Ar = 2-fluorophenyl) reacts metathetically with imines at 80 degrees C to produce [double bond]NR exchange... |
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Title | Iminophosphorane Mediated Imine Metathesis |
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