Radicals propionyl

The photooxidation of diethyl ketone at 120 and 175°C. using oxygen labeled with 2.8 at.-% of oxygen-18 has been reported more recently.48 The two experiments performed at room temperature yielded negligible amounts of carbon monoxide all the carbon dioxide came from the carbonyl group. The experiments performed at higher temperatures were in substantial agreement with those of Noyes and Finkelstein.80 90% of the carbon monoxide came from the decomposition of the propionyl radical [reaction (45)], in contrast to the acetyl radical which yields only 10-20% of the carbon monoxide under conditions that are apparently comparable. 75% of the carbon dioxide came from the car-... 

The products of reaction (6) are the stable ethane molecule and the propionyl radical. This radical is unable rapidly to abstract hydrogen from any other species in the system. It readily decomposes, however, with a high frequency factor and a low activation energy, 20 5 kcal./ mole, to yield carbon monoxide and the ethyl radical. Thus this system is capable of yielding a chain reaction... 

Other small molecules for which photodecarbonylation studies have been made include phosgene in both the gas phaseand as a solid,acetyl chloride, and oxalyl chloride though extrusion of CO is only one of the pathways observed for these species. Photodissociations of acetyl and propionyl radicals have been studied by IR emission spectroscopy of the vibrationally excited CO produced, and an ab initio study of the photodissociation of the formyl radical (HCO) has been made." Trifluoroacetylthiol (CF3COSH) and trifluoroacetyl-sulfenyl chloride (CF3COSCI) have been photolysed in noble gas matrices, to produce CF3SH and CO, and CF3SCI, CO and SCO, respectively." ... 

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