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Scheme 2. DFT-computed free energy paths (in kcalmol”', at 298 K temperature and 1 M concentration) for the reactions of 1 (Ar=o- tolyl) in toluene with HBcat.

Figure 5 DFT-computed free energy paths (in kcalmol”', at 298 K temperature and 1 M concentration) for the reactions of 1 (Ar=o- tolyl) in toluene with HBcat.

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Figure 1. a) Known tetraaryl-substituted diboranes(4), and b) hydrido- substituted aryldiboranes (4). Targeting new avenues to unique boron reagents, our interest focuses on the potential of diboranes(4). Though alkoxydiboranes(4) are exploited extensively in the construc- tion of C-B bonds,'! aryldiboranes(4) have drawn much less attention. While Berndt and co-workers reported the first aryldiborane(4) in 1988,"*! earlier reduction chemistry on Mes,BF failed to generate B,Mes,,'*! perhaps as a conse- quence of steric crowding. Nonetheless, in 1992 Power and co- workers!" isolated the diboranes(4), B,(R)(Mes); (R = OMe, Ph, CH,SiMe;). Such tetraaryl-substituted species (Figure 1a)
Figure 1. a) Known tetraaryl-substituted diboranes(4), and b) hydrido- substituted aryldiboranes (4). Targeting new avenues to unique boron reagents, our interest focuses on the potential of diboranes(4). Though alkoxydiboranes(4) are exploited extensively in the construc- tion of C-B bonds,'! aryldiboranes(4) have drawn much less attention. While Berndt and co-workers reported the first aryldiborane(4) in 1988,"*! earlier reduction chemistry on Mes,BF failed to generate B,Mes,,'*! perhaps as a conse- quence of steric crowding. Nonetheless, in 1992 Power and co- workers!" isolated the diboranes(4), B,(R)(Mes); (R = OMe, Ph, CH,SiMe;). Such tetraaryl-substituted species (Figure 1a)
Scheme 1. Reactions of 1 with hydridoboranes.
Scheme 1. Reactions of 1 with hydridoboranes.
Figure 2. POV-ray depiction of a) 2, b) 4. B: yellow-green; C: black; O: red. All hydrogen atoms have been omitted for clarity.
Figure 2. POV-ray depiction of a) 2, b) 4. B: yellow-green; C: black; O: red. All hydrogen atoms have been omitted for clarity.
Figure 3. POV-ray depiction of 8 as viewed from a) side-on, and b) top- down. B: yellow-green, C: dark grey, H: light grey. All hydrogen atoms except those bound to boron centers have been omitted for clarity. A crystallographic study of 8 revealed it is a square- pyramidal 2,3,4,5-substituted pentaborane(9), B;H;(o0-tolyl), (Figure 3). The basal boron atoms have terminal o-tolyl
Figure 3. POV-ray depiction of 8 as viewed from a) side-on, and b) top- down. B: yellow-green, C: dark grey, H: light grey. All hydrogen atoms except those bound to boron centers have been omitted for clarity. A crystallographic study of 8 revealed it is a square- pyramidal 2,3,4,5-substituted pentaborane(9), B;H;(o0-tolyl), (Figure 3). The basal boron atoms have terminal o-tolyl
Related topics:
Boron ChemistryMedicineDiborane derivativesBoron cluster chemistry
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