C(sp)-H, S-H, and Sn-H Bond Activation with a Cobalt(I) Pincer Complex

Area of Science:

• Organometallic Chemistry
• Catalysis
• Cobalt Complexes

Background:

• Development of catalytic two-electron processes with cobalt.
• Investigation of cobalt(I) pincer complexes for bond activation.

Purpose of the Study:

• To explore stoichiometric reactions of a specific cobalt pincer complex with alkynes, thiols, and tin hydrides.
• To understand the factors influencing oxidative addition and catalytic activity.

Main Methods:

• Stoichiometric reactions of {2,6-(iPr2PO)2C6H3}Co(PMe3)2 with various substrates.
• Analysis of oxidative addition products and reaction completion.
• Evaluation of catalytic hydrostannation of terminal alkynes.

Main Results:

• The cobalt pincer complex cleaves C(sp)-H, S-H, and Sn-H bonds, forming oxidative addition products.
• Electron-withdrawing substituents on substrates enhance reaction completion.
• The complex catalyzes selective hydrostannation of terminal alkynes to yield beta-(Z)-alkenylstannanes.

Conclusions:

• The studied cobalt(I) pincer complex is a versatile reagent for activating various bonds.
• Reaction efficiency is dependent on the electronic nature of the substrate substituents.
• The complex demonstrates catalytic potential in hydrostannation reactions.