Carbonyl halides phosgene

Carbonyl halides and thiocarbonyl halides. All the compounds COCl2/ and COBr2/ have been studied in the vapour state by e.d. and/or m.w., and COCI2 (phosgene) has also been studied in the crystalline state/ The C-X bond lengths are close to the values expected for single bonds, while the C=0... 

Phosgene can be used as the starting material for the preparation of other potentially useful carbonyl halides and carbonyl pseudohalides. Reaction of phosgene with fluorspar, for example, gives COCIF (see Section 9.1.1 and Chapter 16). With aluminium(III) bromide, COBrj is formed (Section 9.1.2.6). Reaction of COClj with HF gives COFj (see Section 9.10.4 and Chapter 13), reaction with silver cyanide gives carbonyl dicyanide, CO(CN)j (Section 9.1.7), whereas reaction with a mixture of sodium fluoride and HCN gives the mixed carbonyl halide pseudohalide, COFCN (Section 9.1.7 and Chapter 13). The chemistry of these... 

SYNTHESIS OF PHOSGENE FROM OTHER CARBONYL HALIDES... 

It is also interesting to note that the mixed carbonyl halide, COBrCl, has been prepared by the reaction of phosgene with aluminium(III) bromide (see Section 9.1.2.6) [2127] ... 

This appendix forms a short reference section giving many of the codes and alternative names which are used for phosgene, and the other carbonyl halides. 

The CAS Registry numbers for the carbonyl halides, and their principal isotopomers, are given in Table A3.1. Synonyms and foreign language equivalents for phosgene are given in Table A3.2, and for carbonyl difluoride in Table A3.3. 

The following sections give convenient laboratory syntheses for phosgene and the related carbonyl halides. These are meant to give the reader an idea of the nature of the procedures involved, and the ease of handling these materials we have found it often easier (and certainly cheaper) to prepare research quantities of these materials than to buy them (with the notable exception of phosgene itself). We draw the readers attention to the disclaimer at the front of this book. 

T.A. Ryan, C. Ryan, E.A. Seddon, and K. Seddon, Phosgene and Related Carbonyl Halides, Elsevier, Amsterdam, 1996. 

Electrochemical, low-temperature, uncatalyzed process for the production of carbonyl halides (not specific to phosgene). 

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