Der Nachweis von Bor in organischer Bindung

Structural studies of organoboron compounds. LII. N-Ethylhydroxylamine- (O-B)1,7-diethyl-3,5-diphenyl-2,4,6-trioxa-7-aza-1-azonia-3-bora-5- boratabicyclo[3.3.0]octane

“…The degree of pyramidalization at N (2) and N(5) in 7b (bond angles sums = 321.7 and 315.1") is essentially the same as that observed for the trivalent nitrogen atoms in 8 (bond angles sums = 319.3 and 317.5").…”

“…For a definite structural assigneight-membered bicyclic ring system, in which the hydroxment (at least in the solid state) an X-ray analysis was unylamine would coordinate either through the nitrogen atom dertaken. The substance gives a reddish color reaction with diphenylcarbazone in methanol, indicating a phenylboronic acid component (2). Crystals suitable for X-ray analysis were obtained by recrystallization from absolute ethanol.…”

“…Contrary to expectations, the crystalline material obtained from the reaction of 1 and oxybis(dipheny1borane) did not give the typical blue color reaction with diphenylcarbazone (2) which would indicate the presence of an intact diphenylboron moiety (by trapping of Ph,B+). The reddish color of this reaction solution indicated the presence of a monophenyl substitution at boron (2) suggesting that a dephenylation had taken place. The ele-'~revious paper in this series: ref.…”

Structural studies of organoboron compounds. XLIII. 4-[(1-Hydroxycyclohexyl)methyl]-2,2,5-triphenyl-1,3-dioxa-4-azonia-2-borata-4-cyclopentene

“…17. bazone showed an intact diphenylboron moiety in the typical blue color reaction (2). By ' H nmr spectroscopy three phenyl groups could be identified, as well as a single methylene group, a pentamethylene group, and one exchangeable OH proton.…”

Structural studies of organoboron compounds XL. 4,7-Dicyclohexyl-2,2,5,6-tetraphenyl- 1,3-dioxa-4-aza-7-azonia-2-boratacycloheptane

“…The crystalline reaction product was shown to be a mono-acylation product of the reaction of bishydroxylamine with diphenylborinic acid using quantitative elemental analysis. The presence of an intact diphenylboron moiety was substantiated by the color reaction with diphenylcarbazone (1). The 'H nmr spectrum confirmed the elemental analysis but no signal for an exchangeable proton (OH or NH) was detectable up to 6 = 20 ppm.…”