(4-CF3C6H4)4(CH3)TeX [X=Cl (trans-7a-Cl) and X=Br (trans-7a-Br)] were synthesized by the following methods: 1) one-potsynthesis of 1 a, 2) the reaction of SO2Cl2 or Br2 with Ar5Te(-)Li+ generated from TeCl4 or TeBr4 with five equivalents of ArLi, 3) reductive cleavage of Ar(6-m)(CH3)(m)Te (m=0 or 2) with KC8 followed by treatment with CH3I, 4) valence expansion reaction from low-valent tellurium compounds
Hexavalent telluriumcompounds, Ar5(CH3)Te, Ar4(CH3)2Te, and Ar2(CH3)4Te (Ar=4-CF3C6H4, Ph, 4-CH3C6H4), were synthesized by the reaction of Ar2-n(CH3)nTe (n=0–1) or Ar3-m(CH3)mTe+X- (m=0–2) with KC8 followed by the treatment with CH3I.
Te(C6H4-4-CF3)(6) 1a was obtained by the unique one-pot reaction of LiC6H4-4-CF3 with TeCl4. The Te atom resides in the highest oxidation state (Te-VI) having six C-Te bonds in 1a. Compound 1a is extremely thermally stable and not light sensitive unlike tetraorganotellurium compounds. The X-ray crystallographic analysis of 1a revealed a rare example of approximately T-h molecular symmetry. (C) 1997 Elsevier Science Ltd.
New and Facile Synthesis of Symmetrical and Unsymmetrical Diaryl Chalcogenides Using Trivalent Organobismuth Derivatives
作者:Thomas Arnauld、Derek H. R. Barton、Jean-François Normant
DOI:10.1021/jo982093x
日期:1999.5.1
Engman Lars, Stern David, Pelcman Mikael, Andersson Carl M., J. Org. Chem, 59 (1994) N 8, S 1973-1979
作者:Engman Lars, Stern David, Pelcman Mikael, Andersson Carl M.