Synthesise a cobalt triphenylphosphite from Cobalt(II) nitrate hexahydrate, Triphenylphosphite and Sodium borohydride. Write the mechanism of...

Synthesise a cobalt triphenylphosphite from Cobalt(II) nitrate hexahydrate, Triphenylphosphite and Sodium borohydride.

Write the mechanism of this reaction.

Expert Solution

The balanced equation between cobalt(II) nitrate hexahydrate, Triphenylphosphite, and Sodium borohydride can be written as follows.

2Co(NO₃)₂.6H₂O + 8P(OC₆H₅)₃ + 7NaBH₄ 2CoH[P(OC₆H₅)₃]₄ + 7NaOH + 7BH₃ + 9H₂O + 4HNO₂

Explanation: Here, the oxidation and reduction reactions can be written as shown below.

Out of 2*6 = 12 H₂O molecules, 5 water molecules are released.

The remaining 7 H₂O = 7 H⁺ + 7 OH^-.

7OH^- combine with 7 Na⁺ to form 7 NaOH.

Out of 7 BH₄^- = 7 BH₃ + 7H^-.

Oxidation: 5H^- 5H⁺ + 10 e^- (10 electrons are lost)

Reduction: 2Co(NO₃)₂ + 2H^- + 8P(OC₆H₅)₃ + 12H⁺ + 10e^- 2CoH[P(OC₆H₅)₃]₄ + 4HNO₂ + 4H₂O (10 electorns are gained).

queen_honey_blossom answered 2 years ago

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