Coordination chemistry of [2 + 2] Schiff-base macrocycles derived from the dianilines [(2-NH<sub>2</sub>C<sub>6</sub>H<sub>4</sub>)<sub>2</sub>X] (X = CH<sub>2</sub>CH<sub>2</sub>, O): structural studies and ROP capability towards cyclic esters
作者:Kuiyuan Wang、Timothy J. Prior、David L. Hughes、Abdessamad Arbaoui、Carl Redshaw
DOI:10.1039/d1dt00711d
日期:——
(6·2MeCN). Use of the related oxy-bridged Schiff-base macrocycles [2-(OH)-5-(R)-C6H2-1,3-(CH)2][O(2-C6H4N)2]}2 (R = Me, L3H2; tBu, L4H2) with CoBr2 led to the isolation of the complexes [(CoBr)2(L3)]·2C3H6O (7·2C3H6O), [Co(NCMe)2(L4H2)][CoBr4]·5MeCN (8·5MeCN), [Co(NCMe)6][CoBr3(MeCN)]2·2MeCN (9·2MeCN). For comparative structural/polymerisation studies, the complexes CoBr(NCMe)L5}2·2MeCN (10·2MeCN) and
[2 + 2] Schiff碱大环[2-(OH)-5-(R)-C 6 H 2 -1,3-(CH)2 ] [CH 2 CH 2(2-C 6 H 4 N)2 ]} 2(R = Me,L 1 H 2 ; t Bu,L 2 H 2)与FeBr 2的配合物得到[FeBr(L 1 H 2)] 2 [(FeBr 3)2 O] ·2MeCN(1 ·2MeCN),[FeBr(L 2 H 2)] [X](X = 0.5(FeBr 3)分别为2 O,2 ·0.5MeCN,X = Br,3 ·5.5MeCN)。处理后,L 2 H 2与[KFe(O t Bu)3(THF)](由FeBr 2和KO t Bu原位形成)反应,导致分离出复合物[Fe(L 2) (L 2 H)]·3MeCN(4 ·3MeCN),同时与[CuBr 2 ]一起提供[CuBr(L 2 H 2)] [CuBr 2 ]·2MeCN(5 ·2MeCN)。试图通过[CoBrL
Structural studies of Schiff-base [2 + 2] macrocycles derived from 2,2′-oxydianiline and the ROP capability of their organoaluminium complexes
作者:Wenxue Yang、Ke-Qing Zhao、Timothy J. Prior、David L. Hughes、Abdessamad Arbaoui、Mark R. J. Elsegood、Carl Redshaw
DOI:10.1039/c6dt01997h
日期:——
of alkyl groups and isolation of the complexes [(AlR′2)4L1′–3′] (R = L2′, R′ = Me (11); L3′, R′ = Me (12); L1′, R′ = Et (13); L2′, R′ = Et (14); L3′, R′ = Et (15)), where L1′–3′ is the macrocycle resulting from double alkyl transfer to imine, namely [2-(O)-5-(R)C6H2-1-(CH)-3-C(R′)H][(O)(2-(N)-2′-C6H4N)2]}2. Molecularstructures of complexes 7·2¼MeCN, 8, 9·4toluene, 10·5MeCN and 11·1¾toluene·1¼hexane
[2 + 2] Schiff碱大环[2-(OH)-5-(R)-C 6 H 2 -1,3-(CH)2 ] [O( 2-C 6 H 4 N)2 ]} 2(R = Me L 1 H 2,t Bu L 2 H 2,Cl L 3 H 2),是通过2,6-二羧基-4-R-苯酚与2,2'-二氨基二苯醚(2- aminophenylether),(2-NH 2 C ^ 6 ħ 4)2 O,已被确定。L n的反应ħ 2与为AlR两个当量' 3(R'=甲基,乙基),得到双核络合物烷基铝[(ALR' 2)2大号1-3〕(R = R'=我(1)中,R =吨卜,R ′= Me(2),R = Cl,R′= Me(3),R = Me,R′= Et(4),R = t Bu,R′= Et(5),R = Cl,R′ = Et(6))。对于对比研究,为AlR'的两个当量的反应3与2,2'- ethylenedianiline和2
Turning on ROP activity in a bimetallic Co/Zn complex supported by a [2+2] Schiff-base macrocycle
作者:Kuiyuan Wang、Timothy J. Prior、Carl Redshaw
DOI:10.1039/c9cc04494a
日期:——
Homo-dinuclear Co and Zncomplexes derived from the macrocycle LH2, [2-(OH)-5-(R)-C6H2-1,3-(CH)2][CH2CH2(2-C6H4N)2]}2 (R = Me, tBu), revealed near inactivity for the ring opening polymerization (ROP) of the cyclic esters δ-valerolactone (δ-VL) and ε-caprolactone (ε-CL). By contrast, the hetero-bimetallic complexes [LCo(NCMe)(μ-Br)ZnBr]·nMeCN (n = 3 or 3.25) were found to be efficient catalysts for
衍生自大环LH 2,[2-(OH)-5-(R)-C 6 H 2 -1,3-(CH)2 ] [CH 2 CH 2(2- C 6 H 4 N )2 ]} 2(R = Me,t Bu),表明环状酯δ-戊内酯(δ-VL)和ε-己内酯(ε-CL)的开环聚合(ROP)几乎没有活性。相反,发现杂双金属配合物[LCo(NCMe)(μ-Br)ZnBr]· n MeCN(n = 3或3.25)是有效的ε-CL和δ- VLROP催化剂。