A facile route toward the synthesis of pentaleno(1,2- b )indoles via multicomponent reaction of indole, aldehyde, and pentafulvene is realized. The reaction proceeds through Lewisacidcatalyzed [3+2] cycloaddition of in situ generated indolylmethanol and pentafulvene. This methodology provides an easy access to biologically relevant indole derivatives.
A process capable of producing an ethylene/α-olefin copolymer having a high molecular weight even under the conditions of a high polymerization temperature is provided. The process for producing an ethylene/α-olefin copolymer includes copolymerizing ethylene and an α-olefin having 3 or more carbon atoms in the presence of an olefin polymerization catalyst including a crosslinked metallocene compound (A) represented by the following general formula [I] and a cocatalyst component (B). In the general formula [I], Y is selected from a carbon atom, etc., M is a hafnium atom or the like, R1 to R12 are each selected from a hydrogen atom, a hydrocarbon group, etc., R13 and R14 are each a substituted aryl group or the like, at least one of R13 and R14 is a substituted aryl group having one or more electron-donating substituents having a Hammett substituent constant σ of not more than −0.2, Q is selected from a halogen atom, etc., and j is an integer of 1 to 4.
Broad Scope [4 + 2] Cycloaddition of <i>o</i>-Carboryne with Pentafulvenes Using 1-Li-2-OTf-<i>o</i>-C<sub>2</sub>B<sub>10</sub>H<sub>10</sub> as Precursor
作者:Jie Zhang、Zaozao Qiu、Zuowei Xie
DOI:10.1021/acs.organomet.7b00574
日期:2017.10.9
from 1-Li-2-OTf-o-C2B10H10 undergoes an efficient [4 + 2] cycloaddition with pentafulvenes at room temperature to give a series of carboranonorbornenes in good to high isolated yields. This reaction is compatible with many functional groups and has a very broad substrate scope from 6-mono- to 6,6′-disubstituted pentafulvenes and from alkyl to aryl substituents. Further transformations of the resultant
从1-Li-2-OTf- o -C 2 B 10 H 10原位生成的邻-碳硼烷(1,2-脱氢-邻-甲硼烷)在室温下进行有效的[4 + 2]环戊五烯加成反应,得到一系列高或高分离产率的碳硼烷降冰片烯。该反应与许多官能团相容,并且具有非常宽的底物范围,从6-单-至6,6'-二取代的五氟戊烯和从烷基至芳基取代基。已经对所得的[4 + 2]环加成产物进行了进一步的转化,从而提供了各种多功能的邻氨基甲酸酯。
Bis(η<sup>5</sup>
:η<sup>1</sup>
-pentafulvene)niobium(V) Complexes: Efficient Synthons for Niobium Carbene and Imido Derivatives
作者:Manfred Manßen、Anna Dierks、Simon de Graaff、Marc Schmidtmann、Rüdiger Beckhaus
DOI:10.1002/anie.201805300
日期:2018.9.10
resulting high nucleophilic character of the exocyclic carbon atom of the ligand, the bis(η5:η1‐pentafulvene)niobiumcomplex is able to achieve the umpolung of a coordinated vinyl unit and the resulting formation of the first η5:η1 cyclic niobium Schrock carbene complex. This new synthetic route is, in comparison to classical α‐hydrogen elimination reactions or thermolysis of diazo compounds, completely unprecedented