Mixed Methyl Aryloxy Rare-Earth-Metal Complexes Stabilized by a Superbulky Tris(pyrazolyl)borato Ligand
作者:Verena M. Birkelbach、Christoph Stuhl、Cäcilia Maichle-Mössmer、Reiner Anwander
DOI:10.1021/acs.organomet.9b00631
日期:2019.11.25
bis(aryloxy) lutetium complexes TptBu,MeLu(OAr)2. Application of a salt-metathesis protocol employing TptBu,MeLnMe(AlMe4) and the potassium aryloxides KOAr made complexes TptBu,MeLnMe(OAr) accessible for the smaller aryloxy ligands as well. All complexes were analyzed by X-ray crystallography to compare the terminal Ln–Me bond lengths and to evaluate the implication of the methyl/aryloxy coordination
根据不同的合成方案,根据酚醛配体的金属大小和空间,以中等至高收率获得了各种混合的甲基芳基氧化物配合物Tp t Bu,Me LnMe(OAr)(Ln = Y,Lu)。TP的反应吨卜中,Me卢梅2和Tp吨卜中,Me YME(阿尔梅4)通过质子分解用1或2当量HOC 6 H ^ 2吨卜2 -2,6-ME-4 Ñ己烷,得到所需的配合物Tp t Bu,Me LnMe(OAr)。Tp t Bu,Me LuMe 2的相应处理在空间上要求较低的HOC 6 H 3 Me 2 -2,6,HOC 6 H 3 i Pr 2 -2,6和HOC 6 H 3(CF 3)2 -3,5导致双(芳氧基)的形成)et络合物Tp t Bu,Me Lu(OAr)2。使用Tp t Bu,Me LnMe(AlMe 4)和芳基氧化钾KOAr制成的络合物Tp t Bu,Me的盐复分解方案的应用LnMe(OAr)也可用于较小的芳氧基配体。通
Process for carboxylating organic substrates with carbon dioxide in
申请人:Montedison S.p.A.
公开号:US03976677A1
公开(公告)日:1976-08-24
Carboxylable substrates i.e., ketones, esters, nitroparaffins and nitriles, containing activated hydrogen atoms are carboxylated by reaction with alkaline phenates and CO.sub.2 in at least one hydrocarbon solvent selected from aliphatic, alicyclic, aromatic and alkyl-aromatic hydrocarbon solvents.
The present invention relates to a compound having the formula L
a
M(OR
1
)
b
R
2
c
X
d
wherein M is a metal selected from Ti, Zr and Hf; L is a ligand selected from permethylpentalene, (hydro)permethyl-pentalene, (hydro)pentalene, cyclopentadiene, indene and ethylene- or silane-bridged indene, preferably (bis)indene; R
1
is a 1-6C alkyl, substituted or unsubstituted phenyl, or a substituted or unsubstituted phenylalkylene group; R
2
is Me or Et; X is halogen; a=1 to 3, b=1 to 3, c=0 or 1 and d=0, 1, 2 or 3; and dimers thereof, the use of the compound as an initiator in the polymerisation of lactide monomer and a process for producing a polylactide performed by contacting a lactide monomer with the compound.
[EN] POLYMERISATION OF CYCLIC ESTERS AND CYCLIC AMIDES<br/>[FR] POLYMÉRISATION D'ESTERS CYCLIQUES ET D'AMIDES CYCLIQUES
申请人:SCG CHEMICALS CO LTD
公开号:WO2019116006A1
公开(公告)日:2019-06-20
A catalytic process for the polymerisation of cyclic ester and cyclic amides is described, which uses, as catalysts, Rare-earth complexes comprising permethylpentalene or (hydro)permethylpentalene ligands. The complexes are notably more active in lactide polymerisation that zirconium-containing analogues.
Ring-opening polymerisation of <scp>l</scp>- and <i>rac</i>-lactide using group 4 permethylpentalene aryloxides and alkoxides
作者:Zoë R. Turner、Jessica V. Lamb、Thomas P. Robinson、Dipa Mandal、Jean-Charles Buffet、Dermot O′Hare
DOI:10.1039/d1dt00252j
日期:——
Group 4 permethylpentalene (C8Me62−; Pn*) aryloxide and alkoxide complexes have been synthesised, fully characterised and used for the polymerisation of lactide monomers.