P,O-Phosphinophenolate zinc(<scp>ii</scp>) species: synthesis, structure and use in the ring-opening polymerization (ROP) of lactide, ε-caprolactone and trimethylene carbonate
作者:Christophe Fliedel、Vitor Rosa、Filipa M. Alves、Ana. M. Martins、Teresa Avilés、Samuel Dagorne
DOI:10.1039/c5dt00458f
日期:——
Structurally diverse phosphinophenolate Zn(ii) heteroleptic and homoleptic compounds are reported, some of which efficiently mediate the controlled ROP of lactide, ε-caprolactone and trimethylene carbonate under living and immortal conditions.
Synthesis and Structure of Neutral and Cationic Aluminum Complexes Supported by Bidentate <i>O</i>,<i>P</i>-Phosphinophenolate Ligands and Their Reactivity with Propylene Oxide and ε-Caprolactone
The O,P-type phosphinophenol ligands 1a−c were found to readily react with 1 equiv of AlMe3 to afford in high yields the corresponding Al chelate complexes η2-O,P-(2-PPh2-4-R′-6-R-C6H2O)}AlMe2, 2a−c (R = Me, R′ = H, 2a; R = Ph, R′ = H, 2b; R = tBu, R′ = Me, 2c). The bis-adduct Al methyl complexes η2-O,P-(2-PPh2-4-R′-6-R-C6H2O)}2AlMe (R = Ph, R′ = H, 3b; R = tBu, R′ = Me, 3c) also formed quantitatively
发现O,P型膦基苯酚配体1a - c容易与1当量的AlMe 3反应,以高收率提供相应的Al螯合物[ 2 -O,P-(2-PPh 2 -4-R' -6-RC 6 H ^ 2 O)}阿尔梅2,图2a - ç(R = Me中,R'= H,2a中; R =苯基,R'= H,2b中; R =吨卜,R'= Me中,图2c)。的双加合物的Al甲基络合物η 2 -O,P-(2-PPH 2 -4-R'-6-RC 6 H ^ 2 O)} 2AlMe(R = Ph,R'= H,3b ; R = t Bu,R'= Me,3c)在膦基酚1b,c与0.5当量的AlMe 3反应时也定量形成。单加成和双加成Al甲基物质2a - c和3b,c都是稳定的单体形式,无论是在溶液中还是在固态,并且在配位溶剂如thf中均保持稳定。与此相反,双-加合物的Al甲基络合物3c中经历在醇源的存在下进行配位体交换反应(我异丙醇,BnOH)以产生均配型三-加合物的Al复合η
Steering of Configuration by (2-Phosphanyl)phenolato Ligands in Trimethylphosphane Iron Complexes
作者:Hans-Friedrich Klein、Markus Frey、Shizhen Mao
DOI:10.1002/zaac.200500021
日期:2005.6
two isomers A and B. 4 and 5 react with their parent phosphanylphenols, respectively, to give diamagnetic complexes Fe(P∧O)2(PMe3) (11, 12) which dissociate trimethylphosphane to give paramagnetic compounds Fe(P∧O)2. The same phosphanylphenols react with FeCl3 to afford racemic mixtures of complexes Fe(P∧O)3 (13, 14). Structural data were also obtained from single crystals of compounds 1, 5, and 11.
temperatures to give yellow Ni(0) complexes such as [(HO∼P)Ni(PMe3)3] 2a with only P coordination of the P⌒OH ligand. Oxidation of solutions of 1 and Ni(PMe3)4 by dioxygen leads to brown bis(o-phosphinophenolato-P⌒O)nickel chelate complexes 3a-d. Structure elucidation by NMR is consistent with a cis-square planar geometry for 3a-c and a trans-square planar solution structure of the tert-butylphenylphosphino
Ring opening polymerisation of lactide with uranium(<scp>iv</scp>) and cerium(<scp>iv</scp>) phosphinoaryloxide complexes
作者:Fern Sinclair、Johann A. Hlina、Jordann A. L. Wells、Michael P. Shaver、Polly L. Arnold
DOI:10.1039/c7dt02167d
日期:——
The C3-symmetric uranium(IV) and cerium(IV) complexes Me3SiOM(OArP)3, M = U (1), Ce (2), OArP = OC6H2-6-tBu-4-Me-2-PPh2, have been prepared and the difference between these 4f and 5f congeners as initiators for the ring opening polymerisation (ROP) of L-lactide is compared. The poorly controlled reactivity of the homoleptic analogue U(OArP)4 (3) demonstrates the importance of the M-OSiMe3 initiating