The synthesis of tridentate dialkylamino ligands containing tertiary phosphorus or arsenic donors

Danopoulos, Andreas A.; Wills, A. Richard; Edwards, Peter G.

doi:10.1016/s0277-5387(00)86821-7

Cited by 42 publications

(30 citation statements)

References 16 publications

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“…Synthesis of ligands with bulkier dialkylphosphanyl substituents failed by this route. The low yield is attributed to the formation of aziridines (CH 2 CH 2 N)CH 2 CH 2 PR 2 as side products 43. This base‐promoted nucleophilic cyclization can be avoided by silyl‐protection of the amine.…”

Section: 16 Valence Electron (16 Ve) Amido Enamido and Dienamidomentioning

confidence: 99%

“…This base‐promoted nucleophilic cyclization can be avoided by silyl‐protection of the amine. Deprotection of the product is easily achieved by heating to reflux in H 2 O or treatment with KF or [ n Bu 4 N]F in MeOH 43,44,45. This pathway affords a wide range of dialkylphosphanyl ligands H L1 R (R = Me, Et, i Pr, t Bu, 1‐adamantyl, cyclohexyl) with good yields (Scheme ) 43,46,47.…”

Section: 16 Valence Electron (16 Ve) Amido Enamido and Dienamidomentioning

confidence: 99%

“…Deprotection of the product is easily achieved by heating to reflux in H 2 O or treatment with KF or [ n Bu 4 N]F in MeOH 43,44,45. This pathway affords a wide range of dialkylphosphanyl ligands H L1 R (R = Me, Et, i Pr, t Bu, 1‐adamantyl, cyclohexyl) with good yields (Scheme ) 43,46,47. Particular mention should be made of the possibility to introduce very bulky groups, such as P t Bu 2 or PAd 2 , which was not reported for the popular diarylamido pincer ligands (Figure 1, { H L A }).…”

Section: 16 Valence Electron (16 Ve) Amido Enamido and Dienamidomentioning

confidence: 99%

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Cooperative Aliphatic PNP Amido Pincer Ligands – Versatile Building Blocks for Coordination Chemistry and Catalysis

2011

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In this review, the coordination chemistry of electron‐rich metal complexes with the simple aliphatic, anionic diphosphanylamido ligand {N(CH2CH2PR2)2}– is covered and compared with other commonly used, anionic PEP (E = C, N) pincer ligands. The strong π‐basicity of this ligand enables both the stabilization of electronically and coordinatively highly unsaturated complexes and their use as cooperating ligands in bifunctional stoichiometric bond activation reactions and catalysis. Versatile ligand backbone dehydrogenation gives access to related enamido and dienamido ligands {(R2PCHCH)N(CH2CH2PR2)}– and {N(CHCHPR2)2}–, respectively. This oxidative functionalization enables fine‐tuning of the ligand donor properties and thereby of the structural features, electronic structure, and reactivity of the respective complexes, which is discussed for several examples.

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Section: 16 Valence Electron (16 Ve) Amido Enamido and Dienamidomentioning

confidence: 99%

Section: 16 Valence Electron (16 Ve) Amido Enamido and Dienamidomentioning

confidence: 99%

Section: 16 Valence Electron (16 Ve) Amido Enamido and Dienamidomentioning

confidence: 99%

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Cooperative Aliphatic PNP Amido Pincer Ligands – Versatile Building Blocks for Coordination Chemistry and Catalysis

2011

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“…The tridentate SNS ligand, in which the central donor is a secondary amine (H substitution), was prepared via literature procedure [8,9] with a little change as is mentioned in Scheme 1.…”

Section: Ligand and Catalyst Characterizationmentioning

confidence: 99%

Synthesis and Optimization of Ethylene Trimerization Using [Bis-(2-dodecylsulfanyl-ethyl)-amine]CrCl3 Catalyst

et al. 2010

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The bis-(2-dodecylsulfanyl-ethyl)-amine (SNS) ligand was prepared in good yield and high purity using inexpensive reagents and reacted with CrCl 3 (THF) 3 at room temperature to give the corresponding SNS/CrCl 3 catalyst in high yield. An ethylene trimerization reaction at 90°C and 23 bar ethylene, using the SNS/CrCl 3 complex activated by 700 equivalents of MAO, afforded 99.97% 1-C6. Only 0.10% PE was produced and the catalyst activity was 159283 g/g Cr/h.

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“…[11] Zu den typischen Ligandgerüsten zählen die Verbindungen 1-5 (Abbildung 1). [12][13][14][15][16][17][18][19][20][21] Die neuesten Entwicklungen auf dem Gebiet dieser nichtpartizipierenden monoanionischen dreizähnigen Ligandsysteme, besonders solcher, die eine zentrale Amidogruppe aufweisen, sind in Übersichten zusammengefasst worden. [10,22] Formal neutrale dreizähnige Liganden haben in den letzten Jahrzehnten großes Interesse erfahren.…”

Section: Einführungunclassified

Neutrale dreizähnige PNP‐Liganden und deren Hybrid‐Analoga: vielseitige Liganden für die kooperative homogene Katalyse

Vlugt¹,

Reek²

2009

Angewandte Chemie

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In der Koordinationschemie sowie in der homogenen Katalyse werden Liganden üblicherweise als “statische” Molekülteile betrachtet, die nicht aktiv in den Katalysezyklus eingreifen. Derartige klassische Systeme liefern deshalb auch keine zusätzlichen Möglichkeiten, um alternative Reaktionswege zu erleichtern. Aktuelle Fortschritte bei der Verwendung neuartiger Pinzettenliganden haben interessante Möglichkeiten für die kooperative Katalyse eröffnet. Die Chemie von Pyridin abgeleiteter neutraler Liganden mit einem zentralen Stickstoffdonor wird vorgestellt. Dabei liegt ein besonderer Fokus auf Situationen, in denen derartige Liganden am Reaktionsgeschehen teilnehmen und folglich ein Potenzial für metallvermittelte organische Umsetzungen aufweisen. Diese Übersicht soll ein Anreiz sein, solche partizipierenden Liganden und deren Metallkomplexe in alte und neue homogenkatalysierte Umsetzungen aufzunehmen.

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The synthesis of tridentate dialkylamino ligands containing tertiary phosphorus or arsenic donors

Cited by 42 publications

References 16 publications

Cooperative Aliphatic PNP Amido Pincer Ligands – Versatile Building Blocks for Coordination Chemistry and Catalysis

Cooperative Aliphatic PNP Amido Pincer Ligands – Versatile Building Blocks for Coordination Chemistry and Catalysis

Synthesis and Optimization of Ethylene Trimerization Using [Bis-(2-dodecylsulfanyl-ethyl)-amine]CrCl3 Catalyst

Neutrale dreizähnige PNP‐Liganden und deren Hybrid‐Analoga: vielseitige Liganden für die kooperative homogene Katalyse

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