Reactions of alkynes with cis-RuCl2(dppm)2: Exploring the interplay of vinylidene, alkynyl and η3-butenynyl complexes

Samantha Eaves, D.S. Yufit, Brian Skelton, J.M. Lynam, Paul Low

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Abstract

© 2015 The Royal Society of Chemistry. Reactions of cis-RuCl2(dppm)2 with various terminal alkynes, of the type HC≡CC6H4-4-R (1 equiv.), in the presence of TlBF4 have resulted in the formation of cationic vinylidene complexes trans-[RuCl(=C=CHC6H4-4-R)(dppm)2]BF4 ([1]BF4). These complexes can be isolated, or treated in situ with a suitable base (Proton Sponge, 1,8-bis(dimethylamino)naphthalene) to yield the mono-alkynyl complexes trans-RuCl(C≡CC6H4-4-R)(dppm)2 (2). Through similar reactions between cis-RuCl2(dppm)2 with 2 equiv. of alkyne, TlBF4 and base, trans-bis(alkynyl) complexes, trans-Ru(C≡CC6H4-4-R)2(dppm)2 (3), can be isolated when R is an electron withdrawing substituent (R = NO2, COOMe, C≡CSiMe3), whereas reactions with alkynes bearing electron donating substituents (R = OMe and Me) form cationic η3-butenynyl complexes [Ru(η3-{HC(C6H4-4-R)=CC≡CC6H4-4-R})(dppm)2]+ ([4]+). This work highlights the importance of the electronic character of the alkyne in influencing product outcome.
Original languageEnglish
Pages (from-to)21016-21024
Number of pages9
JournalDalton Transactions
Volume44
Issue number48
Early online date9 Nov 2015
DOIs
Publication statusPublished - 28 Dec 2015

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