Pentanone vapour

The products formed at room temperature indicate (Table 20) that primary process I occurs in two different ways the molecule decomposes into CH3 and CH3CH2CH2CO radicals in step la, while CH3CO and /1-C3H7 radicals are formed in step Ib. 

Assuming that the decomposition of the acyl radicals is not significant at room temperature, and that the exclusive radical reactions occurring at low temperatures are the recombination, the disproportionation and the hydrogen abstraction reactions, then the following approximate expressions can be derived for i, and 

RATE OF FORMATION OF THE PRODUCTS AS A RESULT OF PRIMARY PROCESS I (in 10 MOLE.l .SEC units) IN THE PHOTOLYSIS OF 2-PENTANONE Room temperature, 3130 A, l 10 quanta.l .sec .  

Applying eqns. (1) and (2) to the data given in Table 20 (taking the rate of formation of C2H4 found in the table and the value of 0.3 for (/ at 3130 A), the following estimates can be obtained 

The rates of formation of biacetyl and ethylene determined by Ausloos and Murad lead to the approximate value of 0.13 for (assuming n to be 0.3 at 3130 A) which is in very good agreement with the one given above. The values ia 0.06 and ib 0.19 can be estimated from the results of Ausloos and Reb-bert °. 

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The salt exploded during drying at 60-100°C in an electric oven, presumably because of overheating which caused pyrolysis to 3-pentanone and ignition of its vapour. 

Among the products of the radiolysis of 2-pentanone and 2-hexanone, ethylene and propene were found in considerable amounts . The distribution of the butenes in the radiolysis of 4-methyl 2-hexanone (both in the vapour and in the liquid phase) was very much similar to that observed in fhe photolysis at short wavelengths . 

Figure 3 High-performance thin-layer chromatographic separation of ten rare earths (as nitrates). Sample, 1 pg each of rare earth layer, silica, impregnated with ammonium nitrate prior to the separation mobile phase, 4-methyl-2-pentanone/terahydrofu-ran/nitric acid/2-ethylhexylphosphonic acid mono-2-ethyl hexyl-ester 3 1.5 0.46 0.46 developing distance, 5 cm detection reagent, (1) spray of saturated alizarin solution in ethanol, (2) ammonia vapour, (3) gentle heating. (After Wang QS and Fan DP (1991) Journal of Chromatography 5S7 359.)...

Psutka, S. Wichterle, I. Isothermal vapour-liquid equilibria in the binary and ternary systems composed of 2-propanol, diisopropyl ether and 4-methyl-2-pentanone Fluid Phase Equilib. 2005,235, 58-63... 

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