2007
1,1,3,3-Tetrakis(alkylthio)-1,3-dilithio-2-silapropanes: useful reagents for the synthesis of polysilacycloalkanes via dianionic ring formation
ARKIVOC
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- First page
- 29
- Last page
- 48
- Language
- English
- Publishing type
- Research paper (scientific journal)
- Publisher
- ARKAT USA INC
Treatment of 1,1,3,3-tetrakis(alkylthio)-2-silapropanes with t-BuLi in THF at -40 degrees C generated 1,1,3,3-tetrakis(alkylthio)-1,3-dilithio-2-silapropanes which reacted with various bifunctional chlorosilanes to give the corresponding 4- to 7-membered polysilacycloalkanes in moderate to good yields. Furthermore, double alkylation of the dilithiated silanes with bis(halomethyl)diorganosilanes or dihaloalkanes was found to proceed smoothly giving rise to 1,4-disilacyclohexanes or silacycloalkanes in good yields, respectively, in THF and an aprotic polar co-solvent such as hexamethylphosphoric triamide (HMPA) or 1,1,3,3-tetramethylurea (TMU). The sulfenyl groups in the cyclized products were smoothly removed by radical reduction with tributyltin hydride.
- Link information
- ID information
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- ISSN : 1551-7004
- Web of Science ID : WOS:000251573000005