CFCs . See

Cm.OROCARBONSANDCm.OROHYDROCARBONS - CARBONTETRACm ORIDE] (Vol5) CFCs. See Chlorofluorocarbons... 

Cements, polyester, 30 CFCs. See Chlorofluorocarbons (CFCs) Chain conformation, 54 Chain extenders, 213-214 structure of, 219 Chain extension, 216 Chain-growth polymerizations, 4 Char formation, 421, 423 Chelated phosphine ligands, 488 Chemical recycling, 208 Chemical structure... 

There is evidence that in some cases, the alkoxy radical formed in the R02 + NO reaction contains sufficient excess energy that it can decompose under atmospheric conditions. This is the case, for example, for some of the alkoxy radicals formed in the oxidation of alternate CFCs (see Chapter 13.D.2a). It has also been postulated for the alkoxy radical formed from the NO reaction with H0CH2CH202, formed in the OH + C2H4 reaction (Orlando et al., 1998). In the latter case, about 25% of the excited (H0CH2CH20) decomposes to HCHO + CH2OH, with the remainder being stabilized. The stabilized radicals then decompose to HCHO + CH2OH or react with 02. 

There is increasing evidence that for some reactions, the R02 + NO reaction produces a fraction of the alkoxy radicals with sufficient energy that they decompose immediately. For example, Orlando et al. (1998) observed that in the reaction of OH with C2H4, approximately 25% of the H0CH2CH20 radicals generated in the reaction of H0CH2CH200 with NO decomposed before they could be collisionally stabilized. Similar observations have been made for R02 from the reactions of alternate CFCs (see Chapter 13). 

This isomerization reaction allows the synthesis of fluorohaloalkanes containing tri-fiuoromethyl groups, which are often not directly accessible by halogen-exchange reactions. These reactions are commercially important in the production of replacements for chloro-fiuorocarbons (CFCs) (see Vol. ElOa, p 65). Much of the work in this area has been published only in the patent literature. 

The nuclear fuel industry (see Section 2.5) uses large quantities of F2 in the production of UFg for fuel enrichment processes and this is now the major use of F2. Industrially, the most important F-containing compounds are HF, BF3, CaF2 (as a flux in metallurgy), synthetic cryolite (see reaction 12.43) and chlorofluorocarbons (CFCs, see Box 13.7). 

At present, the concentration of chlorine atoms is mainly determined by destruction of synthetic chlorofluorocarbons, CFCs (see Section 3). 

CCN, see Cloud condensation nuclei CFCs, see Clilorofliiorocaibons Chain lengtli, 2fl3, 331... 

---