895. Transamination of tetrakisdimethylaminodiboron with aliphatic diamines

Unsymmetrical Diborane(4) Derivatives: A Comparative Study

“…Following the above reasoning (a), we investigated the reaction of selected sterically demanding N ‐substituted ethylenediamine derivatives R–NH–C 2 H 4 –NH–R (R = t Bu, i Pr, Ph) with an equimolar amount of 1 (Scheme ). The reaction conditions resemble somewhat those reported in 1962 by Silver, Hunt, and co‐workers for the synthesis of symmetrical tetraaminodiborane(4) derivatives …”

“…Nevertheless, by using 2 equiv. of the respective diamines the diboranes 4b and 4c were obtained in moderate yields (Scheme ) , . Noteworthily, the reaction of (PhNH) 2 C 2 H 4 with 1 at room temperature in the presence of a stoichiometric amount of HCl led to the isolation of 1,2,1,2‐tetraamino isomer 5c in trace amounts…”

“…1,1,2,2‐B 2 [C 2 H 4 (N i Pr) 2 ] 2 (4b): N , N′ ‐Diisopropylethylenediamine (0.9 mL, 5.1 mmol, 2 equiv.) and 1 (0.5 mL, 2.5 mmol, 1 equiv.)…”

Umsetzungen von Metall- und Metalloidverbindungen mit mehrfunktionellen Molekülen, XXV [1]. Thioureidoborane und Isothioureidoborane / Reactions of Metal and Metalloid Compounds with Polyfunctional Molecules, XXV [1]. Thioureidoboranes and Isothioureidoboranes

“…2-Chlor-1.3-dimethyl-1.3.2-diazaborolidin [5], Bis-(dimethylamino)phenylboran [6], Tris(dimethylamino)boran [7], Phenyldichlorboran [8], Brom-dimethylboran [9,10], Tetramethylzinn [11,12], Chlordiphenylboran [13] sowie die silylierten Thioharnstoffe [14][15][16] wurden nach Literaturangaben hergestellt.…”

Conventional and Microwave Synthesis of 2‐Fluoro‐diazaborolidines and Their Reaction with Lithium Phosphanides

“…To date, an important entry point into DAB chemistry is the preparation of the 2‐halo derivatives, which then allow easy functionalisation at the boron atoms for access to a variety of target molecules. The first‐known routes to such species – base‐induced condensation of ethylenediamines with boron trichloride and transamination of 2‐amino‐DABs (Scheme ) – still remain syntheses of choice. The condensation approach was later extended to access 2‐bromo‐ and 2‐iodo‐DABs from the appropriate boron halides and their amine adducts,, respectively.…”