Edit propylene glycol methyl ether and glycol ether ether glycol ether solvents belong, propylene glycol ethers toxic to humans is less than the price of propylene glycol methyl ether glycol ethers products, low toxicity ethers. Propylene glycol methyl ether has a slight taste of propylene glycol methyl ether ether market, but there is no strong pungent odor, making it more versatile security. Because of its molecular structure both an ether group have a hydroxyl group, so it is excellent dissolution properties, but also an appropriate evaporation rate and reactivity characteristics obtained broad application. (1) under the action of the majority of cases the use of propylene glycol monomethyl ether, activating groups over the role of passive group. (2) the impact of strong activating group is larger than the impact of weak activating group. (3) when the two groups of positioning capability is not much difference, mainly to obtain a mixture. Clever use of substituted orientation effect, reasonably determine the order of substituents into the benzene ring aromatic compounds can be synthesized efficiently. For example, after the synthesis of benzene chlorination nitrochlorobenzene first nitration, and among the first synthetic nitro oxygen nitrification then chlorinated benzene. In another example, when toluene was prepared using 5-bromo-3-nitro-benzoic acid, because three substituents mutually meta glycol methyl ether, so to give priority to introduce the meta position groups, namely first oxidation, nitration and then, finally bromine technology. The preparation of 2,4-toluene-nitrobenzoic acid, the first nitration reoxidation. In addition to the orientation effect groups, the reaction temperature, solvents, catalysts, new entrants to the polarity of many factors, such as the volume of the substituents on the phenyl ring substituents into the position also has an impact. For example, toluene at different temperatures sulfonation yield resulting product isomers are as follows: Xingtai propylene glycol monomethyl ether, propylene glycol monomethyl ether purpose dry chemical Xiang (certified merchants) from Jinan Chemical Co., Ltd. provides dry Cheung . Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) is specialized in the "glycol" enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr.