Di-isopropyl mercury

The flow system pyrolysis has been reported in three papers96,91-99 although one of these96 is a preliminary report of the final paper in this series99. The mechanism proposed is 

It is possible the reaction in the low-temperature region is a chain process similar to that observed in the photolysis of divipyl mercury, viz. 

CH3CHCH3 + Hg(CH3CHCH3)2 = C3H8 + Hg+C3H6 + CH3CHCH3 (7) in competition with 

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The available kinetic and thermochemical data are summarized in Table 7. Based on the approximate equality of E and D1+D2 and on the magnitude of the frequency factor, Billinge and Gowenlock98 would place dimethyl mercury, di-B-propyl mercury, di-isopropyl mercury (above 230 °C) and (on the basis of the frequency factor only, since thermochemical data are not available) di-n-butyl mercury in class II (simultaneous rupture into mercury and two alkyl radicals). If the high frequency factors are simply due to a general softening of the vibrations in the activated state, then in the case of di-isopropyl mercury D2 — 0, while for dimethyl and di-B-propyl mercury D2 is small but finite (2-3 kcal.mole" ). However, within the limits of experimental error all of these alkyls for which thermochemical data are available may have E = Dl+D2, and thus all may belong to class II. At the same time it must be noted that some metal alkyls which are... 

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