14010-93-6Relevant articles and documents
Dibora[10]annulenes: Construction, Properties, and Their Ring-Opening Reactions
Zhang, Weidong,Yu, Demei,Wang, Zhijun,Zhang, Bingjie,Xu, Letian,Li, Guoping,Yan, Ni,Rivard, Eric,He, Gang
, p. 109 - 113 (2019)
The selective construction of various dibora[10]annulenes through mild boron-tin exchange reactions is reported. Dibora[10]annulenes exhibit optical and electrochemical properties of value for future sensing applications. Controlled addition of the Lewis base pyridine to dibora[10]annulenes instigates a selective ring-opening reaction. This work explores a new area of boron chemistry that represents the first step in the potential formation of dibora[10]annulene-derived polymers.
η1 versus η5 bonding modes in Cp*Al(I) adducts of 9-borafluorenes
Romero, Patricio E.,Piers, Warren E.,Decker, Stephen A.,Chau, Dan,Woo, Tom K.,Parvez, Masood
, p. 1266 - 1274 (2008/10/08)
The reactivity of highly Lewis acidic perfluorinated borafluorenes C12F8BR (R = C6F5, 1a; CH3, 1b) and the nonfluorinated 9-phenyl-9-borafluorene (2) toward [Cp*Al]4 was investigated. The reaction of 1 with [Cp*Al]4 leads to the formation of thermally robust η1 Lewis acid-base adducts 3a,b as the thermodynamically favored products. Use of the less Lewis acidic 2 does not alter the mode of reactivity, with the η1 Lewis acid-base 4 formed preferentially. Reduction of 2 to the 9-boratafluorene 2·Li2(THF)n is readily accomplished in THF solution. However, reaction of 2·Li2(THF)n with [Cp*AlCl2]2 or Cp*AlCl2(THF), 5, affords aluminum metal, 2·THF, and Cp*H as the main identifiable products. Compounds 3a, 3b, 4, and 5 were fully characterized including their X-ray structures. A DFT computational study was conducted to probe the reason for the strong preference for η1 bonding, which essentially stems from the localization of aromaticity in the flanking phenyl rings in the 9-borafluorene ring system.
