I WILL GIVE THUMBS UP FOR ANY HELP WITH THE QUESTIONS BELOW
Posted: Mon May 23, 2022 6:50 am
I WILL GIVE THUMBS UP FOR ANY HELP WITH THE QUESTIONS BELOW
2. Pentaborane, B5H9, is an important precursor for higher boranes. It is prepared by the thermal degradation of even lower boranes, as shown below: Na[B3H8] + HCI Na[B3H7CI] + H₂ Step 1 A Na[B3H7CI] B5H9 + NaCl + H₂ Step 2
c. B5H9 can be reduced by elemental sodium to give the salt Na2B5H9 - what happens to the cage in this process and why? [3 marks] d. Reaction of Na2B5H9 with silicochloroform (HSiC13) at high temperature results in the formation of a new cluster, NaSiB5H6. Using Wade's rules, predict the structure of the cluster. How many environments will it possess in the ¹H and ¹¹B{¹H} NMR spectra? [4 marks]
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c. B5H9 can be reduced by elemental sodium to give the salt Na2B5H9 - what happens to the cage in this process and why? [3 marks] d. Reaction of Na2B5H9 with silicochloroform (HSiC13) at high temperature results in the formation of a new cluster, NaSiB5H6. Using Wade's rules, predict the structure of the cluster. How many environments will it possess in the ¹H and ¹¹B{¹H} NMR spectra? [4 marks]