The thermal addition of CF,0sCF3(T 1 to CF2CCl2(E) has been investigated between 49.6 and 69.5"C. The initial pressure of CFJ03CF3 was varied between 7 and 240 torr and that of CF2CC12 between 4 and 600 torr. Four products of formula CF30(E),00CF3, wherej = 1 + 4 are formed. The sum of the products
A reexamination of the pyrolysis of bis trifluoromethyl peroxide. Addendum: Concerning D(CF3O2-CF3) and D(CF3-O2)
โ Scribed by L. Batt; R. Walsh
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 137 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0538-8066
No coin nor oath required. For personal study only.
โฆ Synopsis
Earlier arguments concerning D(CF302-CF3) and D(CF3-02) are shown to be probably wrong. New values of 86 and 49 kcal/mol, respectively, are derived. C-0 bond strengths are compared between CF3-and CH3-containing compounds. This relation is of value only if D,(Oz) is independent of X. This is equivalent tosaying that there is no special interaction between X and the unpaired electron in XO;. This is a reasonable presumption if X is a C-centered moiety, but is not likely to be true for electronegative substituents such as Fand C1-.
๐ SIMILAR VOLUMES
The reaction of CF3 radicals with Ha0 (D20) has been studied over the range of 533-723 K using the photolysis and the pyrolysis of CFJ as the free radical source. Arrhenius pa- rameters for the reactions where X = H or D, relative to CF:j radical recombination are given by log kHlkf'2 = (5.12 f 0.1
Laser-flash photolysis of RBr/O 3 /SF 6 /He mixtures at has been coupled with 248 nm BrO detection by time-resolved UV absorption spectroscopy to measure BrO product yields from O( 1 D) reactions with HBr, CF 3 Br, CH 3 Br, CF 2 ClBr, and CF 2 HBr at The measured 298 ฯฎ 3 K. yields are: HBr, CF 3 Br,
The kinetics of the self-reactions of HO 2 , CF 3 CFHO 2 , and CF 3 O 2 radicals and the cross reactions of HO 2 with FO 2 , HO 2 with CF 3 CFHO 2 , and HO 2 with CF 3 O 2 radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants f
The barium perfluoroalkanedisulfonates Ba(O 3 S) 2 (CF 2 ) n (n = 1, 3ยฑ5) and the new potassium fluoroalkanedisulfonates K 2 (O 3 S) 2 CHF, K 2 (O 3 S) 2 CF 2 , and K 2 (O 3 S) 2 (CF 2 ) 5 have been prepared by reaction of (CF 2 ) n (SO 2 F) 2 (n = 1, 3ยฑ5) or CHF(SO 2 F) 2 with CaO (or Ca(OH) 2 ) an
The kinetics of the reactions O( 3 P) ฯฉ CF 2 "CCl 2 and O( 3 P) ฯฉ CF 3 CF "CF 2 were studied at room temperature in a discharge flow tube system. The overall rate constants based on the measured afterglow reactions were (3.10 ฯฎ 0.40) ฯซ 10 ฯช13 and (3.00 ฯฎ 0.60) ฯซ 10 ฯช14 cm 3 molecule ฯช1 s ฯช1 , respec