195610-06-1Relevant academic research and scientific papers
Synthesis and structures of novel dithiaboretanes containing a group 4, 14, or 15 element
Ito, Mitsuhiro,Tokitoh, Norihiro,Okazaki, Renji
, p. 4314 - 4319 (2008/10/08)
Dilithiation of the dimercaptoborane TbtB(SH)2 (1), which was synthesized by the sulfurization of the corresponding overcrowded lithium aryltrihydroborate bearing the 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) group, followed by treatment with electrophiles such as Cp2TiCl2, Mes2GeBr2, Ph2SnCl2, and TbtSbBr2 resulted in the isolation of novel four-membered boracycles, 1,3,2,4-dithiaboratitanetane, 1,3,2,4-dithiagermaboretane, 1,3,2,4-dithiastannaboretane, and 1,3,2,4-dithiastibaboretane as stable crystals, respectively. The introduction of a C, Si, or P atom to the four-membered ring was not successful. The structures of the newly obtained four-membered boracycles were determined by X-ray crystallographic analysis. The four-membered rings are almost planar and perpendicular to the aromatic ring of Tbt group. The geometries around the boron atom in the four-membered ring are found to be almost trigonal planer, and the S-B-S angles in the ring are not much smaller than 90°, indicating that the geometry around the boron and sulfur atoms was not so different from that of 1 in spite of being embedded in the ring system.
