Crystal Structure of the Molecular Addition Compound Diphenylchloroborane·Tetrahydrofuran

Abstract

Crystalline Ph2BCl·O(CH2)4 is an unexpectedly stable complex containing an intact THF ligand in the presence of a boron halide bond. The short B−O and long B−Cl bonds of this ether cleavage precursor complex are rationalized using Gillespie's ligand close-packing arguments.

Synthesis and structural characterisation of the first bis(bora)calixarene: a selective, bidentate, fluorescent fluoride sensor

“…In contrast to recently reported attempts at organoboron derivatisation of the lower-rim of calixarenes, 8 we found that reaction of tetralithiated 4-tert-butylcalix [4]arene with an organoboron dichloride proceeded in good yield to give 3 as an analytically pure, colourless solid. † Recrystallisation of 3 from acetonitrile yielded crystals suitable for X-ray diffraction.…”

Complexation of Titana‐ and Zirconadihydrofuran Metallacycles with Organoaluminium Compounds and Catalytic Activity of the Resulting Complexes in Polymerization of ϵ‐Caprolactone

“…Anhydrous AlCl 3 does not catalyse the polymerization of THF but forms with it a 1:1 complex . Various organoaluminium compounds as well as Ph 2 BCl and B(C 6 F 5 ) 3 also yield complexes with THF. The greatest lengthening of the C−O bonds of THF (by ca.…”

Synthesis of bis(bora)calix[4]arenes bearing perfluoroaryl substituents

“…1 A significant focus of this research is their application as sensors, 2 of which a particularly attractive approach is the use of boracalixarenes as fluorescent sensors. Recent reports by Davidson et al 3 and Mair et al 4 have highlighted both the ease and difficulties associated with organoboron derivatisation at the lower-rim. In order to increase the scope of this field, alternative and more efficient routes to boracalixarenes are essential.…”

“…In order to increase the scope of this field, alternative and more efficient routes to boracalixarenes are essential. In this context, we are currently investigating the coordination chemistry of bis(bora)calix [4]arenes containing bulky electron-withdrawing perfluoroaryl ligands. Here, we describe the facile synthesis and molecular structures of {[Ar f B] 2 tert-butylcalix [4]arene} (Ar f 5 C 6 F 5 1, 2,4,6-(CF 3 ) 3 C 6 H 2 4), together with the intermediate species {[ClB] 2 tert-butylcalix [4] (1?3MeCN) was obtained as colourless needles in ca.…”

“…In the solid state (Fig. 1), 1?3MeCN crystallises with 3 molecules of solvent (MeCN); one of these solvent molecules sits within the calix [4]arene cone with the methyl group protruding furthest into the cone. § Each boron possesses a pseudo trigonal geometry and both are displaced from the O 4 mean plane by 0.58 A ˚.…”