4- Chlorobenzenediazonium tetrafluoroborate

The dediazoniation of 4-chlorobenzenediazonium tetrafluoroborate in HCO / CO2- buffers can be cited as an example (Schwarz and Zollinger, 1981 Besse and... 

Packer et al. (1981) found that y-irradiation reduces arenediazonium tetrafluoro-borates to aryl radicals. Packer and Taylor (1985) investigated the y-irradiation of 4-chlorobenzenediazonium tetrafluoroborate by a 60Co source in the presence of 1 alone or I- +13 . The major product in the presence of iodide was 4,4 -dichloroazo-benzene. With I- + 1 ", however, it was 4-chloroiodobenzene. Two other investigations of the reactivity of aryl radicals with iodine-containing species are important for the understanding of the chain process of iodo-de-diazoniation that starts after formation of the aryl radical. Kryger et al. (1977) showed that, in the thermal decomposition of phenylazotriphenylmethane, the rate of iodine abstraction from I2 is extremely fast (see also Ando, 1978, p. 341). Furthermore, evidence for the formation of the radical anion V2 was reported by Beckwith and Meijs (1987) and by Abey-wickrema and Beckwith (1987) (see Sec. 10.11). 

Kuokkanen (1985) determined complexation constants for 4-tert-butyl- and 4-chlorobenzenediazonium tetrafluoroborate with polyethylene glycols of average molecular mass 300, 600, 1000, and 2000 under the same experimental conditions as mentioned above. The constants are significantly lower than those with... 

The Gomberg coupling reaction of aryl diazonium salts with arenes is catalysed by quaternary ammonium salts [49], Although yields are variable, they are generally >50% [49, 50]. When aromatic solvents other than benzene are used, the appropriate biaryls are produced, e.g. 4-chlorobenzenediazonium tetrafluoroborate reacts with chlorobenzene to produce the 2,4 -, 3,4 - and 4,4 -dichlorobiphenyls in a ca. 67 18 15 ratio. 

Chlorobenzenediazonium tetrafluoroborate, p-ClC6H4N2 BF4" (1). Slightly hygroscopic, stable at 20°. 

Fig. 15.1 (a) Schematic illustration for the functionalization of SWCNTs in various ILs by mechanically grinding them with diazonium salts at room temperature for minutes and (b) AFM analysis by height of SWCNTs functionalized with 4-chlorobenzenediazonium tetrafluoroborate in OmimBF,. The vertical distances measured (shown as numbers, in nm, on the micrograph) are predominantly <1.4 nm, therefore indicating individual SWCNTs (Reproduced from Ref. [58] with kind permission of the American Chemical Society)... 

---