Aluminum carbenoids in the cyclopropanation of fulvenes
作者:I. R. Ramazanov、A. V. Yaroslavova、N. R. Yaubasarov、U. M. Dzhemilev
DOI:10.1007/s11172-018-2096-5
日期:2018.3
Et2AlCH2I reacts with 6-substituted fulvenes to give tricyclopropanes in high yields. Calculations at the B3LYP/6-31G(d) level of theory show that coplanar arrangement of the double bonds facilitates cyclopropanation due to conjugation in the transition state. Aluminum carbenoid Et2AlCH2I was generated by either the reaction of equimolar amounts of Et3Al and CH2I2 in hexane or treatment of Et2AlI with CH2N2
Unusual rearrangement in the reaction of cyclopropanated cyclopentadienes with Et<sub>3</sub>Al/CH<sub>2</sub>I<sub>2</sub> in CH<sub>2</sub>Cl<sub>2</sub>
作者:I. R. Ramazanov、A. V. Yaroslavova、N. R. Yaubasarov、U. M. Dzhemilev
DOI:10.1080/00397911.2018.1511999
日期:2018.10.2
Abstract The reaction of Et3Al/CH2I2 reagent with cyclopropanated spiro[2.4]hepta-4,6-diene and 6-substituted fulvenes in CH2Cl2 was found to lead to the selective formation of rearrangement products through sequential cyclopropyl-allyl rearrangement and cyclopropanation. Graphical Abstrat
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。
Ansa-metallocene compound, process of preparing the same, and process of preparing polyolefin using the same
申请人:Lee Hoon Choong
公开号:US20060069221A1
公开(公告)日:2006-03-30
Provided are a bridged metallocene compound particularly suitable for copolymerization of ethylene and alpha-olefin or cyclic olefin, a process of preparing the metallocene compound, and a process of preparing polyolefin using the metallocene compound. The bridged metallocene compound has low steric hindrance and good (co)polymerization activity, and thus, exhibits good activity in copolymerization of ethylene and alpha-olefin such as 1-hexene or 1-octene. Furthermore, the process of preparing the bridged metallocene compound is simplified, and thus, suitable for mass production.