Expedient Synthetic Identification of a P‐Stereogenic Ligand Motif for the Palladium‐Catalyzed Preparation of Isotactic Polar Polypropylenes
作者:Falk William Seidel、Izumi Tomizawa、Kyoko Nozaki
DOI:10.1002/anie.202009027
日期:2020.12.7
methods was demonstrated with preparation of twenty‐five new P‐stereogenic phosphine/sulfonate‐ and bisphosphine‐monoxide‐type palladium catalysts, which could typically be developed in parallel. A lead candidate was identified for iso‐specific propylene polymerization. The best‐performing catalysts utilizing the P‐stereogenic donor motif achieved triad isotacticities of up to mm=0.75—the highest value
[EN] MOLYBDENUM OXO ALKYLIDENE COMPOUNDS, METHODS OF MAKING THE SAME AND USE THEREOF IN METATHESIS REACTIONS<br/>[FR] COMPOSÉS OXO-ALKYLIDÈNE DE MOLYBDÈNE, LEURS PROCÉDÉS DE FABRICATION ET LEUR UTILISATION DANS DES RÉACTIONS DE MÉTATHÈSE
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2019157376A1
公开(公告)日:2019-08-15
The invention relates to molybdenum oxo alkylidene complexes of formula (I) wherein R1, R2, R3, R4, R5 and n are defined in the description, methods of making same and use thereof in metathesis reactions.
作者:Feng Zhai、Konstantin V. Bukhryakov、Richard R. Schrock、Amir H. Hoveyda、Charlene Tsay、Peter Müller
DOI:10.1021/jacs.8b09616
日期:2018.10.24
to be a trigonal bipyramidal anti benzylidene complex in which the o-methoxy oxygen is coordinated to the metal trans to the apical oxo ligand. Addition of 1 equiv of water (in THF) to the benzylidyne complex, Mo(CArp)(OR)3(THF)2 (Arp = para-methoxyphenyl, OR = ORF6 or OC(CF3)3 (ORF9)) leads to formation of Mo(CArp)(OR)2(μ-OH)(THF)}2(μ-THF) complexes. Addition of 1 equiv of a phosphine (L) to Mo(CArp)(ORF9)3(THF)2
[EN] IONIC METAL ALKYLIDENE COMPOUNDS AND USE THEREOF IN OLEFINIC METATHESIS REACTIONS<br/>[FR] COMPOSÉS ALKYLIDÈNE MÉTALLIQUES IONIQUES ET LEUR UTILISATION DANS DES RÉACTIONS DE MÉTATHÈSE OLÉFINIQUE
申请人:VERBIO VER BIOENERGIE AG
公开号:WO2019229239A1
公开(公告)日:2019-12-05
A compound of formula (I) wherein: M is selected from Mo or W; X is selected from O or NR5; R1 and R2 are independently selected from H, C1-6 alkyl, and aryl; C1-6 alkyl and aryl optionally being substituted with one or more of C1-6 alkyl, C1-6 alkoxy, and O-C6H5; R3 is selected from a nitrogen-containing aromatic heterocycle being bound to M via said nitrogen; and from halogen; R4 is an aryl oxy group being bound to M via said oxygen of said aryl oxy group; wherein said aryl group Ar of said aryl oxy group is bound to a group Cat such to form a cationic ligand Cat+-Z-ArO-, wherein Z is either a covalent bond or a linker; R5 is alkyl or aryl, optionally substituted.
Synthesis of Cationic Molybdenum Imido 2-Adamantylidene Complexes from Bispyrrolides via Cationic Pyrrolenine Complexes
作者:Bhaskar Paul、Richard R. Schrock、Charlene Tsay
DOI:10.1021/acs.organomet.1c00415
日期:2021.9.13
pyramidal structures with trans nitriles in two basal positions. The bisnitrile complexes are active metathesis catalysts in the presence of 1 equiv of B(C6F5)3, consistent with the 14e monononitrile cationic complexes being the active species. The 14e complex required for metathesis is accessed most readily in bis PhF6CN complexes.
Mo(N- t- Bu)(Adene)(Me 2 Pyr) 2 ( 2a ) (Adene = 2-Adamantylidene, Me 2 Pyr = 2,5-二甲基吡咯烷) 和 Mo(NAr)(Adene)(Me 2 Pyr) 2 ( 2b ) (Ar = 2,6-二异丙基苯基) 通过将 LiMe 2 Pyr 添加到 Mo(N- t -Bu)(Adene)(Triflate) 2 (dme) 和 Mo(NAr)(Adene)(Triflate ) 2 (dme) 复合物。添加 1 当量的 [Me 2 PhNH][BAr F 4 ] (Ar F = 3,5-(CF 3 ) 2 C 6 H3 ) 和超过 2 当量的新戊腈到 Mo(NC 6 F 5 )(Adene)(Me 2 Pyr) 2,然后是 1 当量的 HMTOH(2,6-Mesityl 2 C 6 H 3 OH),导致分离黄色结晶 Mo(NC