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(Arylimido)Vanadium(V)-Alkylidenes Containing Chlorinated Phenoxy Ligands: Thermally Robust, Highly Active Catalyst in Ring-Opening Metathesis Polymerization of Cyclic Olefins
Organometallics ( IF 2.5 ) Pub Date : 2018-06-26 , DOI: 10.1021/acs.organomet.8b00231
Sapanna Chaimongkolkunasin 1 , Kotohiro Nomura 1
Affiliation  

A series of (imido)vanadium(V)-alkylidene complexes containing pentachlorophenoxy ligand of type, V(CHSiMe3)(N-2,6-R2C6H3)(OC6Cl5)(PMe3)2 [R = H, Cl, F, CH3], have been prepared, and the structure of V(CHSiMe3)(N-2,6-Me2C6H3)(OC6Cl5)(PMe3)2 was determined by X-ray crystallographic analysis. Ring-opening metathesis polymerization (ROMP) of cyclic olefins such as norbornene (NBE), cyclopentene (CPE), cycloheptene (CHPE), and cis-cyclooctene (COE) using these alkylidene catalysts have been explored, and V(CHSiMe3)(N-2,6-Cl2C6H3)(OC6Cl5)(PMe3)2 showed higher activities in the ROMP of CPE, CHPE, and COE than those of the reported V(CHSiMe3)(N-2,6-Cl2C6H3)(OC6F5)(PMe3)2. The activity in the ROMP of COE increased at high temperature until 120 °C, and the ROMPs of CHPE and COE proceeded without chain-transfer or termination (nor catalyst decomposition); the (quasi) living nature thus maintained even at 80 °C. The activities in the ROMPs of CHPE and COE (at 25 °C) increased upon addition of 1.0 equiv of B(C6F5)3, whereas the activity in the ROMP of NBE became negligible upon the addition. The order in the activity in the ROMP of cyclic olefins displayed as COE ≪ CHPE < CPE ≪ NBE, which is different from not only that in the ring strain energy but also that reported in the ROMPs using ruthenium–carbene catalysts.

中文翻译:

(Arylimido)钒(V)-亚烷基含氯化的苯氧基配体:环状烯烃开环易位聚合中的耐热,高活性催化剂

一系列含有五氯苯氧基配体类型(V(CHSiMe 3)(N-2,6-R 2 C 6 H 3)(OC 6 Cl 5)(PMe 32 [制备了R = H,Cl,F,CH 3 ],并且得到了V(CHSiMe 3)(N-2,6-Me 2 C 6 H 3)(OC 6 Cl 5)(PMe 32的结构。通过X射线晶体学分析确定。研究了使用这些亚烷基催化剂的环烯烃如降冰片烯(NBE),环戊烯(CPE),环庚烯(CHPE)和顺式环辛烯(COE)的开环易位聚合(ROMP),并且V(CHSiMe 3)(N -2,6-Cl 2 C 6 H 3)(OC 6 Cl 5)(PMe 32在CPE,CHPE和COE的ROMP中显示出比已报道的V(CHSiMe 3)(N- 2,6-Cl 2 C 6 H 3)(OC 6 F 5)(PMe32。直到120°C,COE的ROMP活性均升高,直到120°C,并且CHPE和COE的ROMP进行而没有链转移或终止(也没有催化剂分解)。因此,即使在80°C的条件下,(准)生存性质也得以保持。添加1.0当量的B(C 6 F 53时,CHPE和COE的ROMP中的活性增加(在25°C时),而添加时,NBE的ROMP中的活性可忽略不计。环状烯烃的ROMP活性顺序为COE≪ CHPE <CPE≪ NBE,这不仅与环应变能不同,而且与使用钌-卡宾催化剂的ROMP中所报道的也不同。
更新日期:2018-06-27
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