Donor-substituted CpCo-stabilized cyclobutadienes and superphanes
摘要:
RCpCoL2 complexes (L-2 = (CO)(2) or COD, R = H, CO2Me, TMS) were reacted with various alkynes substituted with chalcogen atoms adjacent to the triple bonds. These reactions yielded hetero-substituted CpCo-capped cyclobutadienes and superphanes dependent on the ring size of the corresponding cyclic diene used as starting material. Reactions in decaline afforded not only CpCo-capped cyclobutadieno superphanes, but also mixed cyclobutadieno cyclopentadienono superphanes. X-ray analyses do not indicate a significant amount of conjugation between the pi systems and the lone pairs of the heteroatoms whereas cyclic voltammetry reveals an easier oxidation when increasing the number of electron-donating heteroatoms. (C) 2004 Elsevier B.V. All rights reserved.
Syntheses and solid state structures of cyclic diynes with two chalcogen centres ? a competition between weak interactions
作者:J. Hilko Schulte、Daniel B. Werz、Frank Rominger、Rolf Gleiter
DOI:10.1039/b303653g
日期:——
Structural investigations by means of X-ray diffraction reveal for most systems a chair-like conformation in the solidstate. For 5S(2)2, 5S(2)3, 7S(2)5, 5Se(2)2 and 5Te(2)3 tubular structures were encountered. These structures can be traced back to weak XX or weak C-Hpi interactions.
Donor-substituted CpCo-stabilized cyclobutadienes and superphanes
作者:Daniel B. Werz、J. Hilko Schulte、Rolf Gleiter、Frank Rominger
DOI:10.1016/j.jorganchem.2004.06.048
日期:2004.9
RCpCoL2 complexes (L-2 = (CO)(2) or COD, R = H, CO2Me, TMS) were reacted with various alkynes substituted with chalcogen atoms adjacent to the triple bonds. These reactions yielded hetero-substituted CpCo-capped cyclobutadienes and superphanes dependent on the ring size of the corresponding cyclic diene used as starting material. Reactions in decaline afforded not only CpCo-capped cyclobutadieno superphanes, but also mixed cyclobutadieno cyclopentadienono superphanes. X-ray analyses do not indicate a significant amount of conjugation between the pi systems and the lone pairs of the heteroatoms whereas cyclic voltammetry reveals an easier oxidation when increasing the number of electron-donating heteroatoms. (C) 2004 Elsevier B.V. All rights reserved.