Arsenic reaction with, phosgene

Cyclic derivatives have also been prepared from quinoxaline-2,3-dithiones by reaction with phosgene (COClj), thiophosgene (CSCI2), and thionyl chloride (SOCI2). 2,3-Disubstituted quinoxalines result from the reaction of the dithiones with isocyanates, isothiocyanates, and imidoyl chlorides (e.g., PhCCl=NMe). Derivatives of quinoxaline-2,3-dithiones incorporating arsenic, antimony, and tin have been prepared for example, with BujSnCl the 2,3-disubstituted quinoxaline 22 is obtained, and... 

The reaction of phosgene with arsenic(III) fluoride was reported, in 1920 [1947], to produce COFj (albeit in small yields and impure). In 1965, treatment of AsFj with an excess of COCI2 (in the presence of catalytic amounts of SbCl ) at 130 C and 5.5 MPa was shown to produce COCIF in 89% yield (with 4% COFj and 7% unreacted phosgene) [378]. The reaction between AsF and COClj, when carried out at 500 "C in an autoclave, produces CCIF3 (85%), CCl Fj (10%), along with traces of CF and CC1 [1454]. The predominant reaction proceeds according to ... 

Davy reported that elemental arsenic and antimony both react with phosgene, upon heating, to produce their respective chlorides and carbon monoxide [467]. Phosphorus, however, can be sublimed in an atmosphere of phosgene without any reaction occurring [467]. 

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