NaCl accelerated oxidation

Thus the reaction of sodium chloride with titanium from the alloy, or rutile from the scale leads to the formation of TiCl2, Na2Ti03, HC1 and Cl2.This list of reactions is by no means exhaustive, and may also involve reaction with other alloying additions which may be substituted for the titanium metal. Particularly, the role of aluminium must be of importance. A thermodynamic analysis by Travkin et al. [32] confirms that complex oxide scales are formed when titanium and its alloys react with NaCl. Particularly that the formation of volatile metallic chlorides are thermodynamically favourable, especially for alloying additions Zr, Mo and Al. The subsequent pyrohydrolysis of these metal chlorides results in the formation of HC1 gas, particularly with Mod., and AlClj. Furthermore, such pyrohydrolysis of halide salts may be accelerated by the presence of alumina within the scales, which acts as a catalyst [25]. 

Indole derivatives with carbonyl units (Scheme 7) have been found in natural products, possess versatile bioactivity and are important intermediates in many organic syntheses. The introduction of the carbonyl moieties to indoles significantly enhances their reactivity and can be achieved by oxidation of indole carbinols with Fe(N03)3-9H20/TEMP0/NaCl at room temperature and atmospheric pressure of dioxygen, using toluene as a solvent. NaCl is an important accelerator for the oxidation, reducing the reaction time from 15 to 2 h however, the role of Cl is not quite clear. 

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