Abstract
The reactions of HC![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CBMIDA (BMIDA = B(O2CCH2)2NMe) with a range of ruthenium complexes afford the first isolated examples of σ-alkynyl, σ-alkenyl and vinylidene complexes bearing 4-coordinate boron substituents. Specifically, the reactions of HCCBMIDA with [RuH(S2CNR2)(CO)(PPh3)2] (R = Me, Et) and [Ru(CO)2(PPh3)3] afford the alkynyl complexes [Ru(CCBMIDA)(S2CNR2)(CO)(PPh3)2] and [RuH(CCBMIDA)(CO)2(PPh3)2], the latter being converted to [Ru(CCBMIDA)Cl(CO)2(PPh3)2] on treatment with chloroform. With [RuCl(dppe)2]PF6 the vinylidene salt [RuCl(![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CCHBMIDA)(dppe)2]PF6 is obtained, which reacts with Et3N to afford the neutral alkynyl derivative [Ru(CCBMIDA)Cl(dppe)2]. Hydrometallation of HCCBMIDA by [RuHCl(CO)(PPh3)3] affords the coordinatively unsaturated σ-alkenyl complex [RuCl(CHCHBMIDA)(CO)(PPh3)2] which in turn reacts with CO, CNC6H2Me3-2,4,6, [Et2NH2][S2CNEt2] or K[HB(pz)3] (pz = pyrazol-1-yl) to afford the coordinatively saturated complexes [Ru(CHCHBMIDA)Cl(CO)2(PPh3)2], [Ru(CHCHBMIDA)Cl(CO)(CNC6H2Me3)(PPh3)2], [Ru(CHCHBMIDA)(S2CNEt2)(CO)-(PPh3)2] and [Ru(CHCHBMIDA)(CO)(PPh3){HB(pz)3}]. In all cases, the transannular N→B dative bond is retained in the BMIDA substituent.
![Graphical abstract: Organometallic chemistry of ethynyl boronic acid MIDA ester, HC [[triple bond, length as m-dash]] CB(O2CCH2)2NMe](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C4DT03695F&imageInfo.ImageIdentifier.Year=2015)
- This article is part of the themed collection: In memory of Professor Kenneth Wade
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![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e002.gif)
CB(O2CCH2)2NMe
