Benzene, decomposition halogen compounds

The colorless needle-shaped crystals of (r-C4H9P)3 (mp 41°, sealed tube) can be stored for months at -18° under an inert gas atmosphere. They are readily soluble in benzene, toluene, THF, dioxane, carbon disulfide, and n-pentane, whereas contact with halogenated hydrocarbons or water brings about decomposition. The compound is rapidly attacked by atmo-... 

Volatile decomposition products may include HCl, HBr, HCN, COCI2, nitrogen oxides (NO ), aromatic hydrocarbons such as benzene, and/or halogenated aromatic compounds. 

Constitution.—The composition of naphthalene is represented by the formula CioHg. What is its constitution In the first place it is a hydrocarbon similar in its chemical properties to benzene and not to methane. It readily forms nitro and sulphonic acid derivatives and its hydroxyl derivatives are analogom to phenols, not to alcohols. It also yields hydrogen and halogen addition products like benzene. The true constitution of the compound has been established by reactions both of decomposition and of synthesis. 

The synthesis of anhydrous metal halides is often a complex process. In thermal dehydration reactions complete removal of water is often complicated by decomposition of the compound. The reactions of metals with gaseous hydrogen halides or with halogens usually takes place at high temperatures and requires apparatus that may not be avaUable routinely. For example, CrBra can be obtained by the action of Br2 on chromium metal at a temperature of 750 °C.53 An alternative method has been proposed for the preparation of this compound that involves the anodic dissolution of chromium in the presence of bromine with a platinum cadiode immersed in benzene connected by a salt bridge to a chromium anode immersed in MeOH/Br2. The electrolytic cell is represented by Eq. 7.7 ... 

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