🏛️國立陽明交通大學機構典藏

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Reversible Cleavage/Formation of the Chromium-Chromium Quintuple Bond in the Highly Regioselective Alkyne Cyclotrimerization
(2017-11-27)
Huang, Yu-Siang
;
Huang, Gou-Tao
;
Liu, Yao-Lun
;
Yu, Jen-Shiang K.
;
Tsai, Yi-Chou
Herein we report the employment of the quintuply bonded dichromium amidinates [Cr{(2)-HC(N-2,6-(Pr2C6H3)-Pr-i)(N-2,6-R2C6H3)}](2) (R=iPr (1), Me (7)) as catalysts to mediate the [2+2+2] cyclotrimerization of terminal alkynes giving 1,3,5-trisubstituted benzenes. During the catalysis, the ultrashort Cr-Cr quintuple bond underwent reversible cleavage/formation, corroborated by the characterization of two inverted arene sandwich dichromium complexes (-(6):(6)-1,3,5-(Me3Si)(3)C6H3)[Cr{(2)-HC(N-2,6-(Pr2C6H3)-Pr-i)(N-2,6-R2C6H3)}](2) (R=Pr-i (5), Me (8)). In the presence of sigma donors, such as THF and 2,4,6-Me3C6H2CN, the bridging arene 1,3,5-(Me3Si)(3)C6H3 in 5 and 8 was extruded and 1 and 7 were regenerated. Theoretical calculations were employed to disclose the reaction pathways of these highly regioselective [2+2+2] cylcotrimerization reactions of terminal alkynes.
Stepwise Construction of the Cr-Cr Quintuple Bond and Its Destruction upon Axial Coordination
(2012)
Huang, Yu-Lun
;
Lu, Duan-Yen
;
Yu, Hsien-Cheng
;
Yu, Jen-Shiang K.
;
Hsu, Chia-Wei
Quintuply-Bonded Dichromium(I) Complexes Featuring Metal-Metal Bond Lengths of 1.74 angstrom
(2008)
Hsu, Chia-Wei
;
Yu, Jen-Shiang K.
;
Yen, Chun-Hsu
;
Lee, Gene-Hsiang
;
Wang, Yu
Remarkably short metal-metal bonds: A lantern-type quintuply bonded Dichromium(I) complex
(2008)
Tsai, Yi-Chou
;
Hsu, Chia-Wei
;
Yu, Jen-Shiang K.
;
Lee, Gene-Hsiang
;
Wang, Yu

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🏛️國立陽明交通大學機構典藏

Search Results