Metastable decompositions of gem-dialkoxyalkanes upon electron impact. III. Diethoxymethane (CH2(OCH2CH3)2)

Complex Acts of Knowing: Paradox and Descriptive Self‐Awareness

“…is (CH 3 ) 2 SiOCH 3 + . This conclusion is in agreement with the thermochemical data,23–26 because Δ H f ((CH 3 ) 2 SiOCH 3 + ) is 147 kJ mol −1 lower than that of Δ H f ((CH 3 ) 2 SiCH 2 OH + ).…”

“…,6 that is, the former value was obtained by (1 + 6.8) × 100/(1 + 8.7) = 80%, and the latter value by (8.7 − 6.8) × 100/(1 + 8.7) = 20%. This result would not be in agreement with the thermochemical data,23–26 because ΣΔ H f of (CH 3 ) 3 SiCH 2 OH + . + CH 2 CO (364 kJ mol −1 ) is higher than that of (CH 3 ) 3 SiOCH 3 + .…”

“…ion is generated preferentially with respect to the (CH 3 ) 3 SiOCH 3 + . ion by the loss of CH 2 CO, in contrast to the thermochemical data 23–26. Such a small energy difference enables the two different fragmentation channels to compete effectively with each other 24…”

Experimental and modeling studies of C2H4/O2/Ar, C2H4/methylal/O2/Ar and C2H4/ethylal/O2/Ar rich flames and the effect of oxygenated additives

“…C 2 H 5 + OCH 2 OC 2 H 5 ) = 10 16.32±0.45 exp(À38,214 ± 1160K/T) s À1 . Tajima et al [21] investigated the decomposition of ethylal upon electro-impact by means of mass-analyzed ion kinetic energy spectrometry (MIKE). They obtained detailed spectra of ethylal fragmentation and of the formed ions.…”

“…To summarize the combustion of ethylal in the rich ethylene flame, the following reactions must be considered: The sub-mechanism taking into account the formation and the consumption of species involved in ethylal combustion is established according to proposed reactions in literature [12,13,[18][19][20][21] and by analogy with methylal decomposition [14]. For each unknown rate constant, we have estimated rate parameters by analogy with reactions involving the species with similar bond breaking.…”