CATALYTIC SILYLOTROPY IN N-TRIMETHYLSILYLPYRAZOLE DERIVATIVES

Authors
LOPYREV VA LARINA LI ALBANOV AI SOROKIN MS DOLGUSHIN GV
Citation
Va. Lopyrev et al., CATALYTIC SILYLOTROPY IN N-TRIMETHYLSILYLPYRAZOLE DERIVATIVES, Russian chemical bulletin, 45(12), 1996, pp. 2861-2862
Citations number
11
Categorie Soggetti
Chemistry
Journal title
Russian chemical bulletin → ACNP
ISSN journal
10665285
Volume
45
Issue
12
Year of publication
1996
Pages
2861 - 2862
Database
ISI
SICI code
1066-5285(1996)45:12<2861:CSIND>2.0.ZU;2-E
Abstract
Silylotropy in 4-substituted N-trimethylsilylpyrazoles is studied by d ynamic H-1, C-13, and Si-29 NMR spectroscopy. The catalytic 1,2-migrat ion of a trimethylsilyl group in 4-halo-N-trimethylsilylpyrazoles was detected. Silylotropy in N-trimethylsilylpyrazoles in the presence of halogens or trimethylhalosilanes is believed to proceed through format ion of N,N'-bis(trimethylsilyl)pyrazolium salts, the barrier of silylo tropy in pyrazoles being markedly reduced.