A novel approach to an oxoborane and its Lewis base complex
摘要:
Reaction of dimethyl sulfoxide (DMSO) with 1,3,2,4-dithiastannaboretane 3 bearing an extremely bulky aryl group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt), an the baron atom gave an oxoborane (Tbt-B=O; 4), which formed a complex with DMSO stable in solution. The formation of the complex was confirmed by B-11 NMR and a [3+2] cycloaddition reaction with 2,4,6-tri-t-butylbenzonitrile oxide. (C) 1997 Elsevier Science Ltd.
Reactions of 1,3,5,2,4,6-trichalcogenatristannins and their derivatives with a nitrile oxide: synthesis, structure, and thermal behavior of oxachalcogenazastannoles
摘要:
2,2,4,4.6,6-Hexamethyl-1.3,5-trithia- and 1,3,5-triselena-2,4,6-tristannins reacted with 2,4,6-tri-t-butylbenzonitrile oxide to give 2,2-dimethyl-1,3-oxathia- and 1,3,5,2-oxaselenazastannoles. The reaction of 2,2,4,4-tetra-t-butyl-1,3,2,4-dithiadistannetane with 2,4,6-tri-t-butylbenzonitrile oxide gave 2,2-di-t-butyl-1,3,5,2-oxathiazastannole. The unusual thermal behavior of the oxachalcogenazastannole is also described. (C) 2001 Elsevier Science Ltd. All rights reserved.
A neutral stannaaromatic compound, 9-stannaphenanthrene 1a bearing an efficient steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt), was successfully generated by the reaction of the corresponding chlorostannane 2 with lithium 2,2,6,6-tetramethylpiperidide in THF at −78 °C. The generaion of 1a was indicated by the trapping experiments using MeOD, Mes*CNO, and 2,3-dimethyl-1,3-butadiene at the same temperature. However, 1a was found to undergo ready dimerization at room temperature to give the cis-[2 + 2] dimer 3 stereoselectively.
Cyclic Chalcogenides Containing Group 13–15 Elements
作者:Renji Okazaki
DOI:10.1080/10426500108546529
日期:2001.1.1
polychalcogenides containing a variety of heavier main groupelements of groups13, 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
1,3,2,4-Diselenastannaboretane, a novel selenium-containing four-membered boracycle: synthesis, structure and thermal cycloreversion into a selenoxoborane
作者:Mitsuhiro Ito、Norihiro Tokitoh、Renji Okazaki
DOI:10.1039/a806478d
日期:——
Treatment of an overcrowded aryl trihydroborate bearing 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) group with Cp2TiSe5 followed by the addition of Ar2SnCl2 (Ar = Ph or Mes) and Ph3P resulted in the isolation of novel selenium-containing four-membered boracycles, 1,3,2,4-diselenastannaboretanes, the thermolysis of which in the presence of 2,3-dimethyl-1,3-butadiene or 2,4,6-tri-tert-butylbenzonitrile oxide indicated the formation of a novel class of boron-containing doubly bonded compound, an arylselenoxoborane (Tbt)BSe.