P-isopropyl toluene, also known as cymene, p-methylisopropylbenzene, is an aromatic monoterpene that exists in nature. Cymene is a para-substituted methyl isopropyl benzene, a colorless liquid that is insoluble in water and miscible with ethanol and ether. P-isopropyl toluene is found in a variety of essential oils and is itself an expectorant and cough suppressant. It can also be obtained by reacting camphor with phosphorus pentoxide and purifying it with acid base. P-isopropyl toluene is often used in conjunction with ruthenium atoms. The parent compound ([(η6-cymene)MCl2]2) is a "semi-sandwich complex" that can be prepared by reacting ruthenium trichloride with α-cresine. Corresponding osmium complexes have also been prepared.以上翻译结果来自有道神经网络翻译（YNMT）· 通用场景