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Nitrosyl chloride
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<p>Nitrosyl chloride is the <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the formula NOCl. It is a yellow gas that is commonly encountered as a component of <a href="/facts/Aqua_regia/AHr1mobH">aqua regia</a>, a mixture of 3 parts concentrated <a href="/facts/Hydrochloric_acid/HqItJlUT">hydrochloric acid</a> and 1 part of concentrated <a href="/facts/Nitric_acid/UDbwGp6s">nitric acid</a>. It is a strong <a href="/facts/Electrophile/1AHFg1zm">electrophile</a> and <a href="/facts/Oxidizing_agent/1FQzB8pQ">oxidizing agent</a>. It is sometimes called Tilden's reagent, after <a href="/facts/William_A._Tilden/m87WzCKN">William A. Tilden</a>, who was the first to produce it as a pure compound. </p>