Laboratory methods for the preparation of singlet oxygen

Singlet oxygen 102(I g) is obtained by reacting active chlorine contained in sodium and calcium hypochlorites with hydrogen peroxide [Refs. 20, 23, 26, 108,109, 222, 223] 

Singlet oxygen is also formed in the reaction of hydrogen peroxide with bromine [412]. McKeown and Waters [411, 412] found that peracids and nitriles evolve singlet oxygen in the presence of hydrogen peroxide. 

Another highly interesting reaction, in which singlet oxygen is formed, was described by Murray and Kaplan [440—442]. An adduct of triphenyl-phosphite and ozone is prepared at —70°C. It decomposes at a temperature as low as —35°C with the liberation of singlet oxygen namely 

It has also been found that the alkaline hydrolysis of peroxyacetyl nitrate (CH3 C002 N02) yields singlet oxygen 102 (1 Ag) [ 587]. 

Singlet oxygen 1 02( Ag) and 1 02( 2g) may also be formed by a high frequency electric discharge in an oxygen atmosphere [Refs. 4, 22, 159, 204, 236, 356] the yield of 1 02( Ag) is about 10%. Atomic oxygen and ozone are also produced in these conditions. 

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