For the catalysed hydrocyanation of buta 1,3 diene (a step in the manufacture of nylon 6,6), the catalyst precursor is NiL4 where L P(OR) 3 Consider the addition of only the first equivalent of HCN (a) Some values of K for are 6 10 10 for R 4 MeC 6 H 4 , 3 10 5 for R i Pr and 4 10 2 for R 2 MeC 6 H...

a The values of K equilibrium constants provided for the reaction NiL4 NiL3 L where L POR3 with different values of R 4MeC6H4 iPr and 2MeC6H4 show a c ...

For the catalysed hydrocyanation of buta-1,3-diene: (a step in the manufacture of nylon-6,6), the catalyst precursor is

Question:

For the catalysed hydrocyanation of buta-1,3-diene:

(a step in the manufacture of nylon-6,6), the catalyst precursor is NiL4 where L = P(OR)₃. Consider the addition of only the first equivalent of HCN.

(a) Some values of K for:

are 6 × 10⁻¹⁰ for R = 4-MeC₆H₄, 3 × 10⁻⁵ for R = ⁱPr and 4 × 10⁻² for R = 2-MeC₆H₄. Comment on the trend in values and on the relevance of these data to the catalytic process.

(b) The first three steps in the proposed catalytic cycle are the addition of HCN to the active catalyst, loss of L, and the addition of buta-1,3-diene with concomitant H migration. Draw out this part of the catalytic cycle.

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