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- Einecs Number 238-671-9
- HMIS 2-4-1-X
- Molecular Formula C8H18Si2
- Molecular Weight (g/mol) 170.40
- TSCA Yes
- Boiling Point (˚C/mmHg) 133-5°
- Density (g/mL) 0.770
- Flash Point (˚C) 2°C (36°F)
- Melting Point (˚C) 22°
- Refractive Index @ 20˚C 1.413
Used to prepare 1,2-bis(aryl)acetylenes.3
Reacts with internal acetylenes to form 1,2,4,5-tetrasubstituted benzenes.4
Useful in silicon-mediated Sonogashira cross-coupling reactions.5
Used to prepare 4-alkynylthiazoles.6
1. Weber, W. In Silicon Reagents for Organic Synthesis; Springer-Verlag: 1983, p129.
2. Vollhardt, P. Acc. Chem. Res. 1977, 10, 1.
3. Nishihara, Y. et al. J. Org. Chem. 2000, 65, 1780.
4. Li, S. et al. Org. Lett. 2009, 11, 3318.
5. Larson, G. L. “Silicon-Based Cross-Coupling Reagents” Gelest, Inc. 2011.
6. Arunkukmar, K. et al. Tetrahedron Lett. 2012, 53, 3885.
Alkynylsilane Cross-Coupling Agent
The cross-coupling reaction is a highly useful methodology for the formation of carbon-carbon bonds. It involves two reagents, with one typically being a suitable organometallic reagent - the nucleophile - and the other a suitable organic substrate, normally an unsaturated halide, tosylate or similar - the electrophile.
Silicon Chemistry, Articles
Hatanaka and Hiyama first reported the palladium-catalyzed, fluoride-promoted reaction of aryl, alkenyl, allyl, and ethynyltrimethylsilanes with aryl, vinil and allyl halides to form the respective cross-coupled products
In amongst the considerable chemistry of acetylenes there lies some unique chemistry of alkynylsilanes (silylacetylenes) some of which is reviewed herein. This unique character is exemplified not only in the silyl protection of the terminal C–H of acetylenes, but also in the ability of the silyl group to be converted into other functionalities after reaction of the alkynylsilane and to its ability to dictate and improve the regioselectivity of reactions at the triple bond. This, when combined with the possible subsequent transformations of the silyl group, makes their chemistry highly versatile and useful.