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Updated: Jun 7, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
Published on: November 22, 2016
Synthesis and N-C bond cleavage reactions for cyclic phosphazenium dications
Linkun Miao1, Amir Yeganeh-Salman1, Jason Yeung1
1Department of Chemistry, University of Toronto, 80 St George St, Toronto, ON, Canada, M5S3H6. dstephan@chem.utoronto.ca.
Abstract:
Phosphazenium cations were first characterized 60 years ago and yet little is known of their reactivity. The bidentate phosphonium dicationic salts [(C6H4)(PPh2F)2][B(C6F5)4]22 and [(C6H4)(PPh2Cl)2][Cl]23 were prepared. Reaction of 2 with (Me3Si)2NMe gave the phosphazenium dication [(C6H4)(PPh2)2(μ-NMe)][B(C6F5)4]24, while reaction of 3 with two equivalents of Me2N(SiMe3) gave the related dication [(C6H4)(PPh2NMe2)2][Cl]25. Compound 3 also reacted with (Me3Si)2NH affording the monocationic salt [(C6H4)(PPh2)2(μ-N)]Cl 6, with the liberation of HCl. Interestingly 4 reacted with [nBu4N]Cl generating the related salt [(C6H4)(PPh2)2(μ-N)][B(C6F5)4] 6' with concurrent formation of MeCl. This reactivity was extended to [(C2H4)(PPh2F)2][B(C6F5)4]27 which afforded [(C2H4)(PPh2)2(μ-NR)][B(C6F5)4]2 (R = Me 8, CH2CHCH29, CH2Ph 10) upon reaction with (Me3Si)2NR. These dications were shown to react with [nBu4N]Cl affording [(CH2PPh2)2(μ-N)][B(C6F5)4] 11 and the corresponding alkyl-chloride. The mechanism of these N-C bond cleavage reactions is considered.
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