A process for producing oxidized organic chemical products such as propylene oxide from various organic chemical feedstocks utilizing as oxidant directly produced hydrogen peroxide (H2O2) intermediate oxidizing agent. The hydrogen peroxide intermediate is directly produced from hydrogen and oxygen feeds plus a suitable solvent in a first catalytic reaction step utilizing an active supported phase-controlled noble metal catalyst at reaction conditions of 0-100° C. temperature and 300-3,000 psig pressure. An organic chemical feedstock such as propylene together with the hydrogen peroxide intermediate and solvent solution are fed into a second catalytic reactor maintained at 0-150° C. temperature and 15-1,500 psig pressure and oxidized to produce a desired crude oxidized organic product such as propylene oxide, which is purified by distillation steps and recovered from the solvent solution.