Henning Witte-Abel, C. Drost, U. Klingebiel
Aug 15, 1999
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Influential Citations
2
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Journal
Journal of Organometallic Chemistry
Abstract
Abstract Acetoacetic- and 4-oxopentanoic-acid-ethylester-N-tri(organyl)silylhydrazones (1–4), R2R′Si–NH–NCMe–(CH2)n–COOEt; 1: R=CMe3, R′=C6H5, n=1; 2: R=CMe3, R′=Me, n=1; 3: R=CHMe2, R′=CMe3, n=1; 4: R=CMe3, R′=C6H5, n=2) are obtained as cis/trans isomers by condensation of tri(organyl)silylhydrazines and acetoacetic (1–3)- or 4-oxopentanoic-acid-ethylesters (4). Heating 1–3 form ethanol and O-silylpyrazolones (5–7) by a 1,3-N,O-silyl group migration. Complex 7 reacts with ClSiMe3 in the presence of Et3N in a substitution of the NH group to give 5-siloxy-3-methyl-2-trimethylsilyl-pyrazolone, 8. In a molar ratio 2:1 the analogous reaction of 1 and Cl2SiMe2 leads to the formation of the bis(5-siloxy-3-methyl)-1,2-diaza-3,5-cyclopentadienyl)dimethylsilane 9. The crystal structures of 5 and 9 are reported.