C 10 H 26 B 20 Se 4 , monoclinic, P12 1 /n1 (no. 14), a = 10.3649(4) Å, b = 13.8582(7) Å, c = 18.3667(8)
Source of materialIn an NMR tube, tropylium bromide (0.15 g, 0.88 mmol) was added to a solution of 1,2-bis(trimethylsilylseleno)-1,2-dicarbacloso-dodecaborane(12) (0.1 g, 0.224 mmol) in 1.0 mL of deutered benzene, a yellow solution was observed and analyzed by NMR spectroscopy. After one month, the formation of yellow crystals was observed, the crystals were isolated and analyzed by X-ray diffraction (yield 0.012 g, 12 %).
DiscussionRecently, we described the molecular structures of cyclic compounds of tellurium
A lkynes, Ketenes, Tin, NMR DataThe thermally induced decomposition o f ethoxyethynyl(trimethyl)tin (1) was studied by ll9Sn NM R which revealed the formation o f bis(trimethylstannyl) ketene (2) as the major product, bis(trimethylstannyl) acetic acid ethyl ester (3) as a minor product, and a small amount o f tetramethyltin (4). Full NM R data sets, including coupling constants and isotope induced chemical shifts 1 _ \ 12 13C( 1 l9Sn) are provided for 1 -3 . The first example o f ultra-high resolution " 9Sn NM R is shown.
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