600 



6. ARSENICALS 



We shall, in general, adopt the terminology of Doak and Freedman (1960). 

 (see accompanying tabulation). Most arsenicals can be named in different 



ways; e. g., phenyl-As=0 can be called phenylarsine oxide, phenylarse- 

 noxide, or arsenosobenzene. All the trivalent arsenicals are basically de- 

 rivatives of arsine, AsHg, and can be named on this basis. In tables of 

 inhibition we shall frequently use abbreviations such as 9^-AsO for phen- 

 ylarsenoxide or 9^-As02 for phenylarsonic acid. These are not meant to 

 indicate the state of the substance in solution but are used only for brevity. 

 For example, 9^-As(OH)2 is the hydrated from of 9^-AsO, and 97-AsO(OH)2 

 is the hydrated form of 99-ASO2; in solution the hydrated form probably 

 predominates. The names and structures of some of the commonly used 



