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Entrapment of Ru3(CO)12 and Os3(CO)12 within alumina sol-gel matrices, (obtained by hydrolysis and polycondensation of a THF solution of aluminum isopropoxide) converts these clusters into highly active, leach-proof and recyclable hydrogen transfer catalysts. Likewise Rh2Co2(CO)12 which, in its silica sol-gel entrapped form, neither promotes the isomerization of allylbenzene nor the disproportionation...