Boron reaction with, phosgene

Chlorodifluoroamine has been prepared by reaction of difluoro-amine with boron trichloride,1 phosgene (carbonyl chloride),2 or hydrogen chloride 2 treating a mixture of sodium azide and sodium chloride with fluorine 3 reaction of chlorine trifluoride with ammonium fluoride 4 reaction of chlorine with diflu oro-amine in the presence of potassium fluoride 5 and photolysis of tetrafluorohydrazine and sulfinyl chloride (thionyl chloride).6... 

Reactions of phosgene with Group 13 halides 9.1.2.1 Reaction of phosgene with boron(in) fluoride... 

The reaction of phosgene with copper has been used to purify boron(III) chloride (see Section 9.1.2.2) [1218a]. Copper does not react with phosgene at room temperature [735], but does react between 260 and 400 C, with an activation energy of 100 kJ mol, to give copper(I) chloride [809] ... 

One of the serious drawbacks of the Wittig reaction is the unavoidable production of triphenylphosphane oxide in stoichiometric quantities. Whilst its direct reduction with boron, aluminium or silicon hydrides would be possible, these reagents are too expensive for a viable process. In fact, distilled triphenylphosphane oxide is reacted with phosgene, generated in situ, to give the corresponding dichloride, which is then reduced with metals, like aluminium. [55]... 

The reactions of amines and amine hydrochlorides with phosgene in the gas-liquid phase are reported to be catalyzed by numerous compounds such as morpholine [74], boron trifluoride [75], aluminum chloride [76], N,N-dialkylcarbamates [77], N,N-dialkylamides [78, 79], tetraalkylureas and thioureas [78-80], hexamethyl-phosphoramide [78], as well as activated carbon [81]. 

Isocyanates may be prepared via a number of routes, including the thermal cracking of urethanes or silylurethanes [107], or the reaction of N-alkylcarbamate esters with boron trichloride [108] or chloroboranes [109] or chorosilanes [110] in the presence of bases (NEt3). To date, however, only amine phosgenation is practiced on a significant industrial scale [10, 106],... 

The first claim to have synthesised COBrCl was published in 1895, when Besson [184] reported that the reaction between boron(in) bromide and phosgene (150 C 12 h) yielded a mixture of COBrj and COBrCl, which he separated by distillation (see also Sections 9.1.2.3 and 14.3). The colourless fraction claimed as COBrCl boiled between 35 and 37 C, had a density of 1.98 g cm , and slowly reacted with cold water [184]. The vapour "irrite les... 

When the solvent takes part in acid-base phenomena, the reactions are usually displacement reactions. Considering only acid-base reactions, solvents may be divided into three classes (1) those that are ordinarily inert toward acids and bases, e.g., benzene, carbon tetrachloride, and chlorobenzene (2) those that are ionizable, e.g., water, ammonia, sulfur dioxide, phosgene, and selenium oxychloride (3) those that do not ionize but do react with acids and bases, e.g., ether and pyridine. If we consider the neutralization of boron trichloride by triethylamine in the three types of solvents, we find that the net result may be the same as when the neutralization occurs in the absence of a solvent ... 

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