1,2:3,4:5,6‐Tris(2,2′‐biphenylylen)borazol, trimeres 9,10‐Azaboraphenanthren

Abstract

Beim Schmelzen bildet sich unter exothermer Reaktion ein stark vernetztes Polymeres, das unschmelzbar und in organischen Losungsmitteln unloslich ist, leicht in Wasser quillt, durch langeres Erhitzen mit Sauren und Laugen hydrolysiert wird und sich bei 300 "C zersetzt.

The Overcrowded Borazine Derivative of Hexabenzotriphenylene Obtained through Dehydrohalogenation

“…In contrast to the previous report, [6] 4 is sufficiently soluble for full spectroscopic charac-terization. In contrast to the previous report, [6] 4 is sufficiently soluble for full spectroscopic charac-terization.…”

“…[2] Notable recent achievements are, among others, the synthesis of a BN-pyrene by the Piers group, [3] and advances in the chemistry of 1,2-dihydro-1,2-azaborines. Their (BN) 3 derivatives 3 and 4 were described first by Dewar et al [2c,2d] and by Köster et al, [6] respectively. Their (BN) 3 derivatives 3 and 4 were described first by Dewar et al [2c,2d] and by Köster et al, [6] respectively.…”

“…[6] It was thus characterized by MS and IR spectroscopy, [6] and its propeller-like structure was later determined by single-crystal X-ray diffraction. [6] It was thus characterized by MS and IR spectroscopy, [6] and its propeller-like structure was later determined by single-crystal X-ray diffraction.…”

“…[7] The isostructural, overcrowded hydrocarbon 2 has proven to be difficult to synthesize and characterize. [9] Interestingly, Köster recognized that his borazine derivative 4 is a trimer of 9,10-azaboraphenanthryne (6), which is the BN analogue of aryne 5. [9] Interestingly, Köster recognized that his borazine derivative 4 is a trimer of 9,10-azaboraphenanthryne (6), which is the BN analogue of aryne 5.…”

“…[8,9] The most convenient and highyielding synthesis is the palladium-catalyzed cyclotrimerization of 9,10-phenanthryne 5. [6] BN-arynes or 1,2-azaborines, [10] such as monomer 6, have never been detected or trapped previously. [6] BN-arynes or 1,2-azaborines, [10] such as monomer 6, have never been detected or trapped previously.…”