Beiträge zur chemie des bors XLVIII. Zur kenntnis von bis(dialkylboryl)aminen
作者:Heinrich Nöth、Heinrich Vahrenkamp
DOI:10.1016/s0022-328x(00)89761-2
日期:1969.3
Diborylamines of the types (R2B)2NH and (R2B)2NR′ (R = CH3, C2H5, C3H7, C4H9;R′ = CH3) are obtained (a) from dialkylhaloboranes and disilazanes, (b) from dialkylhaloboranes and N-metalated aminoboranes, and (c) by aminolysis of dialkyl(mthylthio)boranes. They are thermodynamically unstable with respect to a decomposition into trialkylboranes and borazine derivatives; their decomposition is catalysed
得到(R 2 B)2 NH和(R 2 B)2 NR'(R = CH 3,C 2 H 5,C 3 H 7,C 4 H 9 ; R'= CH 3)类型的二硼胺(a)来自二烷基卤庚烷和二硅氮烷,(b)来自二烷基卤庚烷和N-金属化的氨基硼烷,以及(c)通过二烷基(甲硫基)硼烷的氨解反应)。就分解成三烷基硼烷和硼嗪衍生物而言,它们在热力学上是不稳定的。它们的分解主要是由二烷基卤呋喃酮催化的。
NMR-spektroskopische untersuchungen an borverbindungen III. 1H-NMR-spektren von methyl- und äthylboranen
作者:H. Nöth、H. Vahrenkamp
DOI:10.1016/s0022-328x(00)90894-5
日期:1968.4
1H NMR spectra of 71 methyl- and ethylboranes R3−nBXn (R = Me. Et; X =NMe2, OMe, F, SMe, Cl, Br, I) and derivatives thereof are reported. From the chemical shifts the electronegativity of boron in these compounds has been estimated and the inductive effect, π-bonding and neighbour anisotropy effect of the substituents X on the spectra are discussed. The conclusions arrived at are further substantiated
报道了71个甲基和乙基硼烷R 3- n BX n(R = Me。Et; X = NMe 2,OMe,F,SMe,Cl,Br,I)及其衍生物的1 H NMR光谱。根据化学位移,估计了这些化合物中硼的电负性,并讨论了取代基X在光谱上的感应效应,π键和邻域各向异性效应。通过取代基X = NMe 2,OMe和SMe的1 H NMR数据以及与11 B化学位移的比较进一步证实了得出的结论。
Preparation of some organo-bis(diisopropylamino)boranes and their application to the synthesis of oxazaborolidines
作者:P.Y. Chavant、M. Vaultier
DOI:10.1016/0022-328x(93)80377-n
日期:1993.8
The reactivity of ClB(NEt2)2 and ClB(NiPr2)2 towards organomagnesium or organolithium derivatives was studied. ClB(NiPr2)2 proved to be an excellent reagent for the preparation of pure boronic derivatives RB(NiPr2)2 which can be used for an efficient synthesis of oxazaborolidines, including Corey's CBS catalyst.
研究了ClB(NEt 2)2和ClB(N i Pr 2)2对有机镁或有机锂衍生物的反应性。CLB(N我镨2)2被证明是用于制备纯的硼酸衍生物的RB(N优异的试剂我镨2)2,其可以被用于恶唑硼烷的有效合成,包括科里的CBS催化剂。
New reactions and reagents.
作者:Shyam K. Gupta
DOI:10.1016/s0022-328x(00)84867-6
日期:1978.8
This communication describes three developments which permit convenient synthesis of dialkylboranes, dialkylborinicacids and esters, and mixed trialkylboranes from readily synthesized dialkyl(diethylamino)boranes. These reactions proceed cleanly and quantitatively. The isolation or purification of the intermediates is not necessary. These developments are: (i) the reduction of o-hydroxyphenyldialkylborinates
Competition between intra- and inter-molecular reactions of borates: a new route to 1,4-dihydro-1,4-distannines
作者:Susanna Kerschl、Bernd Wrackmeyer
DOI:10.1039/c39860001170
日期:——
The reaction of the system (E)-2-dimethyl(chloro)stannyl-3-diethylborylpent-2-ene (1)–LiNEt2 in hexane can be controlled to give 1,4-dihydro-1,1,2,4,4,5-hexamethyl-3,6-diethyl-1,4-distannine (3) in high yield, demonstrating the intermediacy of aminoborate (5) and the preference (under the reaction conditions) of intermolecular electrophilic attack at the B–C bond accompanied by final elimination of