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- W1964332743 abstract "Abstract The reaction of TeCl 4 with diorganyl diethynyl silanes RR 1 Si(C CH) 2 in CHCl 3 at room temperature leads to regio- and stereoselective formation of a new class of unsaturated five-membered heterocycles, 4,4-diorganyl-1,1,3,6-tetrachloro-1,4-tellura(IV)silafulvenes, in high yields. In the case of dialkyl substituents at the silicon atom the reaction proceeds with 100% stereoselectively to afford only E -isomers, while for cyclic diethynyl silanes the spiro-heterocycles formed have Z - and E -configurations, E -isomers being the predominant ones. Structures of the heterocycles have been proved by the multinuclear ( 1 H, 13 C, 29 Si, 125 Te) NMR spectroscopy, 2D NOESY NMR spectroscopy and mass-spectrometry. Z -Isomers are characterized by a long-range spin–spin interaction of protons through five bonds with 5 J HH 0.2–0.5 Hz lacking in E -isomers. In the mass spectra the heterocycles manifest themselves as the fragment ions [M−Cl 2 ] + ." @default.
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- W1964332743 date "2008-11-01" @default.
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- W1964332743 title "4,4-Diorganyl-1,1,3,6-tetrachloro-1,4-tellura(IV)silafulvenes – New class of tellurium–silicon containing heterocycles" @default.
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- W1964332743 doi "https://doi.org/10.1016/j.jorganchem.2008.05.037" @default.
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