Immobilization of a Platinum Catalyst Using the Polymer Incarcerated (PI) Method and Application to Catalytic Reactions

Abstract

Immobilization of a platinum catalyst was carried out on the basis of the polymer incarcerated (PI) method. The PI platinum catalyst thus prepared showed high activity in hydrosilylation, and recovery and reuse of the catalyst were attained without loss of activity. Application of this catalyst to hydrogenation is also reported.

Key words

immobilization - platinum - polymer - hydrosilylation - hydrogenation

References

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  ³¹P{¹H} NMR analysis data (ppm): PI Pt (1) (CDCl₃, SR-MAS): δ = 28.8 (s) [solid PPh₃ (δ = -8.4) was used as an external standard]. Confer: O=PPh₃ (CDCl₃): δ = 29.3; PPh₃ (CDCl₃): δ = -4.7.

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  Pt(PPh₃)₄ (toluene-d ₈): δ = 9.2; Pt(PPh₃)₃ (toluene-d ₈): δ = 49.9; Pt(PPh₃)₂ (O₂) (toluene-d ₈): δ = 16.4.

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14

The lower detection limit is 5 ppm.

15

The lower detection limit is 0.4 ppm.

21

The reaction using pentamethyldisiloxane gave the hydrosilylation product in 69% yield (6:7 = 85:15), while diethoxymethylsilane also gave a similar result (60% yield, 6:7 = 85:15).