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C–H Bond Activation Facilitated by Bis(phosphinoamide) Heterobimetallic Zr/Co Complexes

Journal Article · · Organometallics
 [1];  [2];  [3];  [2];  [2]
  1. The Ohio State Univ., Columbus, OH (United States); The Ohio State University
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Brandeis Univ., Waltham, MA (United States)

The activation of C–H bonds using first-row transition metals poses a formidable challenge in the development of sustainable catalytic methods. Early/late heterobimetallic complexes provide a Lewis acidic binding site for directing groups, facilitating the activation of C–H bonds at an appended first-row transition metal center. In this work, the reactivity of the ZrIV/Co–I heterobimetallic complexes (THF)(I)Zr(XylNPiPr2)2Co(PR3) (1-PR3; Xyl = 3,5-dimethylphenyl; PR3 = PMe3, PPh2Me) toward directed C–H bond activation is explored with pyridine and terminal alkyne derivatives. 1-PMe3 reacts reversibly with 4-methylpyridine to afford the C–H activated complex (4-Me-C5H4N)(I)Zr(XylNPiPr2)2(μ-4-Me-C5H3N)Co(PMe3)(H) (3-PMe3). By using the more Lewis basic substrate 4-tert-butylpyridine, (I)Zr(XylNPiPr2)2(μ-4-tBu-C5H3N)Co(PMe3)(H) (4-PMe3) is formed irreversibly. In addition to pyridine derivatives, 1-PPh2Me can activate the C–H bond of terminal alkynes to form (THF)(I)Zr(XylNPiPr2)2(μ-R'C≡C)Co(PPh2Me)(H) (R' = Ph (5-PPh2Me); R' = SiMe3 (6-PPh2Me)).

Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019179
OSTI ID:
1835591
Journal Information:
Organometallics, Journal Name: Organometallics Journal Issue: 21 Vol. 40; ISSN 0276-7333
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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