Sulfur-functionalized methyltin compounds nBu(3)SnCH(2)S(O)(i)R (i = 0, 1, 2; R = Me, Ph) underwent transmetallation with Grignard compounds MgR'X (R' = Me, nBu, Ph; X = Cl, Br, I) and diorganomagnesium compounds MgR'R" (R'/R" = Me/Me, nBu-sBu) to provide Sn(nBu)(3)R and Mg[CH2S(O)(i)R]X and Mg[CH2S(O)(i)R]R", respectively. Analogously, the reaction of nBu(3)SnCH(2)P(O)Ph-2 with Mg(nBu)Br afforded quantitatively Mg[CH2P(O)Ph-2]Br and Sn(nBu)(4). Transmetallations between it Bu3SnCH2YMe2 (Y = N, P) and MgMe2 proceeded only in the presence of catalytic amounts (10-20 mol%) of Lin Bu yielding Mg(CH2YMe2)Me and Sn(nBu)(3)Me/Sn(nBu)(4). (C) 2002 Elsevier Science B.V. All rights reserved.
C–H and C–F coordination of arenes in neutral alkaline earth metal complexes
作者:Jacob S. McMullen、Alison J. Edwards、Jamie Hicks
DOI:10.1039/d1dt01532j
日期:——
series of neutral magnesium and calcium complexes bearing an extremely bulky diamido ligand have been synthesised and crystallographically characterised. A number of these complexes feature rare group 2 metal⋯aromatic interactions, such as the η6-coordination of benzene and ‘agostic-like’ C–H coordination, the latter previously unseen in neutral Mg and Ca complexes.
一系列带有极其庞大的二酰氨基配体的中性镁和钙配合物已被合成并进行了晶体学表征。许多这些配合物具有稀有的第 2 族金属⋯芳族相互作用,例如苯的 η 6配位和“类似 agostic”的 C-H 配位,后者以前在中性 Mg 和 Ca 配合物中未见。
Facile magnesiation of carbon brønsted acids with electrophilic, donor-free alkylmagnesium compounds
作者:John J. Eisch、Ramiro Sanchez
DOI:10.1016/0022-328x(85)80378-8
日期:1985.12
readily between 25 and 110° C with a series of carbon Brønsted acids to produce the corresponding unsolvated diorganomagnesium derivatives in excellent yields. Such facile magnesiations provide a superior preparative route to donor-free compounds of the R2Mg type, where R is cyclopentadienyl, indenyl, 9-fluorenyl or 1-alkynyl. Furthermore, sulfones form isolable 1/1 complexes with n-butyl (s- butyl)magnesium
The present invention provides novel catalysts of formula (I), where M
1
and M
2
are different and are independently selected from Mg, Zn, Fe, Co, Al and Cr, and catalyst systems comprising these catalysts. The invention also relates to the use of the inventive catalysts and catalyst systems to catalyse the reaction between i) carbon dioxide and an epoxide, ii) an epoxide and an anhydride, or iii) a lactide and/or a lactone. The invention also relates to a method for producing a catalyst of formula (I).
Calcium and Magnesium Bis(β-diketiminate) Complexes: Impact of the Alkylene Bridge on Schlenk-Type Rearrangements
作者:Philipp Rinke、Helmar Görls、Robert Kretschmer
DOI:10.1021/acs.inorgchem.1c00301
日期:2021.4.5
2-cyclohexylene, using calcium and magnesium precursors. Four mononuclear homoleptic calciumcomplexes were obtained, highlighting the pronounced tendency of calcium to undergo Schlenk-like redistributions. In the case of magnesium, however, the bridging group plays a crucial role, yielding seven dinuclear heteroleptic complexes but also one mononuclear and one dinuclear homoleptic complexes. In addition, a
reactivity and coordinationchemistry were investigated. Transmetalation of these magnesocenes gives access to group 14 metallocenes (tetrelocenes), as well as to group 15 stibonocenes. These s‐ and p‐block metallocenes represent a novel class of bis(phosphanyl) ligands, exhibiting Lewis‐amphiphilic character. Their coordinationchemistry towards different transition‐metal and main‐group fragments was