170958-46-0Relevant academic research and scientific papers
Cyclic chalcogenides containing group 13-15 elements
Okazaki, Renji
, p. 41 - 50 (2001)
Novel cyclic polychalcogenides containing a variety of heavier main group elements of groups 13, 14, and 15 as ring members have been synthesized as stable crystalline compounds by taking advantage of an effective steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]-phenyl (denoted as Tbt in this article). The molecular structures of tetrachalcogenametallolanes of group 14 elements, Tbt(R)ME4 (M = Si, Ge, Sn, and Pb; E = S, Se), and some polysulfides containing antimony or boron atom as a ring member were analyzed by X-ray crystallography to elucidate the skeletal features of these novel ring systems. Dechalcogenation reactions of these cyclic polychalcogenides with trivalent phosphorus reagents provide new and useful synthetic methods for the doubly bonded compouds between the corresponding heavier main group element and a chalcogen atom, a novel class of low-coordinate compounds in the main group element chemistry.
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.
