Blue Tetrakis(diisopropylamino)-cyclo-tetraborane and Yellow Tetrakis(tetramethylpiperidino)tetrabora-tetrahedrane

Abstract

The colored boranes closo-1 and cyclo-2 are obtained upon dehalogenation of sterically hindered diaminodichlorodiborane(4) 3. The TMP groups of 1 cause the formation of a tetrahedrane, whereas in 2 the diisopropylamino substituents stabilize the bent four-membered ring. TMP=2,2,6,6-tetramethylpiperidino.

NMR parameters of the tetrahedrane [Fe2(CO)6(μ-SNH)], studied by experiment and DFT

“…2) within reasonable time (several hours). Although numerous iron cyclopentadienyl [19,[22][23][24][25] and mononuclear iron tricarbonyl complexes [19,26] have been studied by 57 Fe NMR, the large class of complexes containing the Fe 2 (CO) 6 fragment has been left untouched. This can be explained by the limited solubility of many of these compounds.…”

“…Tetrahedrane-type structures are common in both main group [1][2][3][4][5][6] and transition metal chemistry [7][8][9][10][11][12]. We have been interested for some time in aza-diferra-thiatetrahedranes, since the parent hexacarbonyl derivative 1 can be obtained in good yield (>50%) from the reaction of bis(trimethylsilyl)sulfur diimide with Fe 3 (CO) 12 , followed by chromatography on silica [13].…”

Some past achievements and future perspectives in main group chemistry

“…Theoretical calculations on the parent diborene, HBBH [9], predict that this molecule is a ground state triplet, thus portending a high reactivity for this class of compound. Despite several attempts to synthesize such compounds, the present situation is that two amido-substituted diborenes have been claimed but not isolated as pure compounds [10]. Likewise, in the case of the dialuminene, Ar 0 AlAlAr 0 (Ar 0 = C 6 H 3 -Dipp 2 ; Dipp = C 6 H 3 -2,6-i-Pr 2 ) it was not possible to isolate this compound per se; however, its existence was inferred from the isolation of the 2 + 4 cycloaddition product with toluene [11] (Fig.…”

Triaminotriborane(3): A Homocatenated Boron Chain Connected by B−B Multiple Bonds

“…Their existence has been proposed on the basis of mass‐spectrometric data . The larger cyclic catenated analogues VI and VII , which can be regarded formally as oligomers of IV and/or V , were isolated (Figure d,e).…”

“…In the case of DME as the solvent, 2 was obtained in around 15 % yield along with a small amount of yellow crystals of 3 (Scheme ). Compound 2 might be formed by borylene coordination to the desired diborene, similar to a cheletropic reaction, and dimerization of the diborene might form the tetrahedral cluster 3 , (see Figure S10).…”