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  Weblink 8.2 Movie showing how key MOs change during the H- + BH3 reaction

This movie shows how various occupied MOs change during the reaction H- + BH3. The HOMO (MO4) starts out as a 1s AO on the hydride and ends up as a B—H bonding MO in BH4. The other MOs change less significantly, remaining as B—H bonding MOs throughout.