An article Formation of Active Cyclic Five-membered Frustrated Phosphane/Borane Lewis Pairs and their Cycloaddition Reactions WOS:000502664500001 published article about DIELS-ALDER REACTIONS; ADDITION-REACTIONS; DIHYDROGEN ACTIVATION; HYDROBORATION; BORANE; HYDROGENATION; CHEMISTRY; EXCHANGE; BIS(PENTAFLUOROPHENYL)BORANE; ORGANOBORANES in [Dong, Shunxi; Daniliuc, Constantin G.; Kehr, Gerald; Erker, Gerhard] Westfalische Wilhelms Univ Munster, Organ Chem Inst, Corrensstr 40, D-48149 Munster, Germany; [Dong, Shunxi] Sichuan Univ, Coll Chem, Minist Educ, Key Lab Green Chem & Technol, Chengdu 610064, Sichuan, Peoples R China in 2020.0, Cited 91.0. Quality Control of Chalcone. The Name is Chalcone. Through research, I have a further understanding and discovery of 94-41-7
The cyclic five-membered frustrated phosphane/borane Lewis pairs 11 a, b featuring the bulky octaethylhydrindacenyl- (Eind) substituent or its mono-bromo derivative ((Br)Eind) at phosphorus are monomeric at room temperature. The reactive frustrated Lewis pairs (FLPs) cleave dihydrogen. The cyclic FLP 11 b ((Br)Eind) undergoes 1,2-P/B addition to ethylene to give the zwitterionic heteronorbornane derivative 14 b. It reacts similarly with the carbon-carbon double bond of norbornene. With a variety of organic pi-reagents, the cyclic FLP 11 b often undergoes reaction sequences reminiscent of the Alder-Rickert reaction: the cycloaddition reaction is followed by rapid cycloreversion to form new five-membered heterocyclic FLP products with extrusion of ethene. Reactions of 11 b with benzaldehyde or with acetylenes follow this reaction pattern.
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