68983-27-7Relevant academic research and scientific papers
A Highly Lewis Acidic Strontium ansa-Arene Complex for Lewis Acid Catalysis and Isobutylene Polymerization
Dabringhaus, Philipp,Krossing, Ingo,Scherer, Harald,Schorpp, Marcel
, p. 22023 - 22027 (2020)
The potential of a dicationic strontium ansa-arene complex for Lewis acid catalysis has been explored. The key to its synthesis was a simple salt metathesis from SrI2 and 2 Ag[Al(ORF)4], giving the base-free strontium-perf
Method for synthesizing 1,2-diphenylethane derivative by catalyzing coupling of sp3C-H bond through graphene-loaded palladium/platinum
-
Paragraph 0033; 0034, (2018/07/15)
The invention provides a novel method for catalyzing activation of an sp3C-H bond to build a 1,2-diphenylethane compound by developing a novel graphene-loaded bimetal palladium/platinum catalyst whichis simple, convenient and efficient, is free of guide groups and free of participation of solvents and can be reused, so as to increase the yield of the target product, simplify operation steps and improve an atom utilization ratio and the recovery of the catalyst. The invention provides an economical, efficient and green method for preparing the compound. The method has the main advantages thatexperiment operation is simple and convenient, guide groups are not needed, the participation of other solvents is not needed, and the catalyst can be repeatedly recycled.
Spatial Structure of 4n? Helicene Dianions
Frim, R.,Goldblum, A.,Rabinovitz, M.
, p. 267 - 274 (2007/10/02)
Helicene dianions, e.g. phenanthrene derivatives, once believed to be non-helical, maintain their chirality as 4n? dianions.Phenanthrene 5, as well as substituted phenanthrene derivatives, undergo a two-electron reduction to form the respective 4n? dianion e.g. 52-/2Li+.Phenanthrene derivatives substituted at the 4- and 5-positions (bay substituents) e.g. 6-11, which are helical, afford stable dianions.These dianions are also prepared by a two-electron reduction of the (4n+2)? electron hydrocarbons and show, in their 1H NMR spectra, a quench of the paratropicity compared to 52- as well as a line shape dependence on their twist angle.The quench of paratropicity was also observed in the closely related charged helicenes derived from the benzochrysene system, i.e. anions 122- and 132-.The twist angles were calculated by MMX and MNDO calculations for the neutral systems, i.e., 5-11, and by MNDO for the dianions.MNDO calculations also included the preferred location of the counter cation.A dynamic NMR spectroscopic study proves experimentally the helicity of anion 112- thus shedding light on the behaviour of this novel class of dianions.
