The Multifaceted Palladium Chemistry of 2,2′-Diphosphinotolanes
The Multifaceted Palladium Chemistry of 2,2′-Diphosphinotolanes
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2,2-二膦酰基的多面钯化学
DOI:
10.1021/acs.organomet.1c00052
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发表时间:
2021
期刊:
影响因子:
2.8
通讯作者:
J. Ballmann
中科院分区:
文献类型:
--
作者:
H. K. Wagner;N. Ansmann;T. Gentner;H. Wadepohl;J. Ballmann
The 2,2′-bis(diisopropylphosphino)tolane1was reacted with various palladium precursors to afford a surprisingly diverse array of palladium(II) and palladium(I) complexes. The conventional cationic [PCCP]PdCl+pincer-type complex2was readily obtained by starting from1and anin situgenerated PdCl+fragment. Upon chloropalladation of2via reaction with a chloride source, a novel vinyl–palladium pincer complex (3) featuring a new C–Cl bond was produced quantitatively. The newly formed C–Cl bond in3may be cleaved by addition of AgBF4, which led to the regeneration of2. Treatment of1with (MeCN)2PdCl2afforded3in a single step, while the analogous reaction between1and [(η3-allyl)PdCl]2did not result in chloride or allyl addition. Instead, the alkyne was attacked by one of the phosphines to afford the cationic CArY-MIC palladium complex4(CArY-MIC = cyclic (aryl)(ylidic) mesoionic carbene). Upon reaction of1with dibenzylidene acetone palladium(0) precursors, two alkynes were coupled to afford the novel palladol5. When Pd(CNR)2(R =tBu, Cy) was employed instead of the latter palladium(0) precursors, yet another product was isolated: namely, a dinuclear Pd(I)–Pd(I) complex. In this complex, both palladium atoms are located within the pocket of the ligand and stabilized by isonitrile coligands (CNR with R =tBu for6aand R = Cy for6b). The latter isonitriles may be exchanged reversibly for carbon monoxide, as shown byin situNMR spectroscopy. The finding that five significantly different palladium complexes (2–6) have been isolated by starting from a single phosphino alkyne is discussed in the context of phosphino–palladium-catalyzed alkyne transformations.
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DOI:
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发表时间:
1978
期刊:
影响因子:
--
作者:
L. D. Brown;J. Ibers;K. Itoh;H. Suzuki;K. Hirai
通讯作者:
K. Hirai
影响因子:
4
作者:
Tetsuro Murahashi;Taketoshi Okuno;Kenta Usui;K. Takase;T. Otani;S. Ogoshi;H. Kurosawa
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H. Kurosawa
DOI:
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发表时间:
1962
期刊:
影响因子:
--
作者:
E. Fischer;H. Werner
通讯作者:
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DOI:
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发表时间:
2006
期刊:
影响因子:
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作者:
H. Huh;Y. Lee;Soon W. Lee
通讯作者:
Soon W. Lee
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
J. Klosin;K. Abboud;W. Jones
通讯作者:
W. Jones