Abstract
Several new compounds of the type [CpOsH 2(PPh 3) 2] + X −, where X = Cl, Br, I, I 3, BPh 4, p-toluenesulphonate, d(+)-campho-10-sulphonate, have been obtained in the form of ion pairs or salts. The above compounds form during oxidative addition by HX acids to CpOsH(PPh) 3) 2. The reactions are complete after several seconds, with a quantitative yield. This is in contrast to the behaviour of CpRuH(PPh 3) 2, where covalent CpRuX(PPh 3) 2 forms. Reactions of CpOsH(PPh 3) 2 with DCl acid (excess) gives [CpOsD 2(PPh 3) 2]Cl, but no [CpOsHD(PPh 3) 2]Cl is formed. Refluxing CpOsBr(PPh 3) 2, in ethylene glycol for instance, gives a [CpOsH 2(PPh 3) 2] + cation as a result of the dehydrogenation of the glycol. Compounds of the type, [CpOsH 2(PPh 3) 2]X, in solutions of polar solvents (MeOH) or halogenated hydrocarbons (e.g. CH 2X 2) undergo transformation to CpOsX(PPh 3) 2 during the reductive elimination process. In this way novel CpOsI(PPh 3) 2 has been obtained. In the case of the reaction of a mixture of HX + X 2 with CpOsH(PPh 3) 2, [CpOsHBr(PPh 3) 2]Br 3 (for Br 2) and [CpOsH 2(PPh 3) 2]I 3 (for I 2) have been obtained in the form of sparingly soluble ion pairs with yields of about 90%.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.