| 摘要 |
An improved process is described for the catalytic dehydrogenation of organic molecules having a <IMAGE> group to produce a <IMAGE> group. The organic molecules are: <IMAGE> I <IMAGE> II <IMAGE> III <IMAGE> IV wherein: A1, A2, A3, and A4 are each independently P, As or N: E2 is independently C or N; E3 is independently C, Si or Ge; E4 is independently C, Si, or Ge; and E5 is independently C, Si or Ge; M1, M2, M3, and M4 each is a metal atom independently selected from the group consisting of ruthenium, rhodium, palladium, osmium, iridium and platinum; Q1, Q2, Q3, and Q4 are each independently a direct bond, -CH2-, -CH2CH2-, or CH=CH-; in structure I, structure II or structure IV, R1, R2, R3, and R4 are each independently selected from alkyl, alkenyl, cycloalkyl, and aryl, or R1 and R2 together and R3 and R4 together form a ring structure having from 4 to 10 carbon atoms, or in structure III, R5, R6, R7, and R8 are each independently selected from alkyl, alkenyl, cycloalkyl, and aryl, or R5 and R6 together and R7 and R8 together form a ring structure having from 4 to 10 carbon atoms, at a temperature of between about 100 DEG and 250 DEG C. for between about 1 hr and 300 days in the absence of N2. The surprisingly stable catalyst is a complex of an organic ligand comprising H, C, Si, N, P atoms, and a platinum group metal. The dehydrogenation is performed between about 100 to 200 DEG C., and has increased turnover.
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