Abstract
The oxidation of Ni(PPh 3) 4 with BF 3 · OEt 2, H 3CCOOH, and F 3CCOOH, and that of (PPh 3) 2Ni(C 2H 4) with BF 3 · OEt 2 is studied by EPR spectroscopy. The reaction of the Ni(0) complexes with BF 3 · OEt 2 gives Ni(II) complexes with which they react to form Ni(I) compounds with covalent Ni–F and Ni–B bonds that transform with excess BF 3 · OEt 2 into cationic paramagnetic Ni(I) complexes. Acetic acid also adds oxidatively to Ni(PPh 3) 4 to form a Ni(II) complex that reacts further to give Ni(I) hydride and carboxylate complexes. The Ni(I) hydride is transformed by the acid into the Ni(I) carboxylate with release of hydrogen, the amount of which depends on the rate of acid addition. The following Ni(I) complexes are identified in the reaction medium: [Ni(PPh 3) 3]BF 4, [(PPh 3) 2Ni(OEt 2)]BF 4, [(PPh 3)Ni(OEt 2) n ]BF 4, (PPh 3) 2NiBF 2, (PPh 3) 3NiOOCCH 3, and [(PPh 3) 2Ni(OEt 2)P(OEt) 3]BF 4. Oxidation schemes of Ni(0) complexes by Lewis and Brønsted acids are given.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
