Hydrides pentachloride

Dangerous materials may require special equipment. Chlorination with gaseous chlorine requires quite expensive storage facilities. Chlorination with chlorine, thionyl chloride, sulphuryl chloride, phosphorus oxychloride, phosphorus trichloride, or phosphorus pentachloride, all of which are fairly hazardous, requires off-gas treatment. Some of these reactants can be recycled. Pyrophoric solids such as hydrogenation catalysts, anhydrous aluminium trichloride for Friedel-Crafts reactions, or hydrides used as reducing agents should usually be handled using special facilities. Therefore, all of the above proce.sses are usually carried out in dedicated plants. 

Lithium aluminum hydride Lithium hydride Methyl isocyanate Methylaluminum sesquibromide Methylaluminum sesquichloride Methyldichlorosilane Methylene diisocyanate Methylpentaldehyde Methyltrichlorosilane Mono-(trichloro)-tetra-(mono-potassium dichloro)-penta-s-triazinetrione, dry Monochloro-s-triazinetrione acid Octadecyltrichlorosilane Phenyl trichlorosilane Phosphorus oxychloride Phosphorus pentachloride Phosphorus pentasulfide... 

Tris(trimethylsilyl)chlorosilane is obtained in 50% and 80-90% yield when the corresponding hydride is treated with phosphorus pentachloride and carbon tetrachloride, respectively, while tris(trimethylsiIyl)bromosilane is produced in 79% yield when the hydride is allowed to react with 1-bromo-butane (59). 

The structure XXII for rhynehophylline has been confirmed, and the relative stereochemistry at C-15 and C-20 has been elucidated, by a total synthesis (80) of (+) JV-methylrhynchophyllane (XXVI) (Marion s N-methylisorhynchophyllane), which had been prepared earlier by methyl-ation of (iso)rhynchophyllane with sodium methoxide and methyl iodide (28). The lactone (XXVII) of threo-3,4-diethyl-5-hydroxyvaleric acid was converted by reaction with phosphorus pentachloride into the corresponding S-chloroacid chloride (XXVIII), which on treatment with methylaniline gave the anilide XXIX. Reduction of XXIX with lithium aluminum hydride gave the aldehyde XXX, which slowly reacted with... 

As we have already mentioned, it was Kennedy who proposed that monomers possessing an allylic hydrogen can be converted into the corresponding allylic cart nium ions through a hydride-ion abstraction promoted by Levns acids. This reaction would not require a cocatalyst and could therefore explain in principle the occurrence of direct initiation. A similar mechanism had previously been claimed by Holmes and Pettit to rationalise the formation of carbenium ions from certain hydrocarbons and antimony pentachloride, e.g. ... 

The product of the action of phosphorus pentachloride on pyrrolidinone is (128), contrary to a previous report. The ylide (129) undergoes a [2,3] shift to compound (130) under the influence of sodium hydride. 

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