38 results about "2-Methylpentane" patented technology

An amino alcohol derivative represented by the following general formula (1) (for example, (±)-2-amino-5-[4-(3-benzyloxyphenylthio)-2-chlorophenyl]-2-methylpentane-1-ol) exhibits strong immunosuppressive effect while causing less side effects:

The invention provides an environment-friendly cleaning agent for an electronic industry. The environment-friendly cleaning agent is composed of the following components by weight: 45-70% of 2-methyl pentane, 15-25% of absolute ethyl alcohol, 5-10% of isopropanol and 10-20% of ether solvent. A primary solvent of the environment-friendly cleaning agent for the electronic industry is the 2-methyl pentane; a toxic property of the 2-methyl pentane on human bodies is one twentieth of normal hexane; the 2-methyl pentane has specially good dissolving capacity on rosin in scaling powder; the ether solvent has good dissolving capacity on polar materials such as organic acid in the scaling powder; and the absolute ethyl alcohol has good greasy dirt removing functions. The environment-friendly cleaning agent for the electronic industry does not contain halohydrocarbon such as the normal hexane and trichloroethylene, and has no environmental effect caused by ozone depletion. The environment-friendly cleaning agent for the electronic industry is basically nonhazardous to human bodies.

The multicomponent mixed work medium throttling refrigerating agent applicable to 200-240 k temp. zone includes four groups of substances, respectively are: first group includes tetrafluoromethane, nitrogen trifluoride or mixture; second group includes ethylene, ethane, fluoroform, xenon, fluromethane, perfluoroethylene, fluoroethylene, perfluoroethane or their any two, three and several kinds or mixture of all them; fourth group includes 1-butylene, isobutane, 2-methyl butane, 1-pentene, 3-methyl-1-butylene, 2-methylpentane, 2-butylene, cyclobutane, isobutylene, n-butane, pefluorobutane, n-pentane, perfluoropentane or their two, three, several kinds ormixture of all the them; and third group includees propylene, propane, perfluoropropane, 1,1,1-trifluoroethane, 1,1,-bifluoroethane.

The multicomponent mixed work medium throttling refrigerating agent applicable to medium-low temp. zone includes five groups of substances, the sum of their mole concentration is 100%, in which first group includes methane, krypton or mixture, total mole concentration is 5%-45%, second group includes tetrafluoromethane, nitrogen trifluoride or mixture, total mole concentration is 15%-55%; fourth group includes propylene, propane, perfluoropane, 1,1,1-trifluoroethane, 1,1-bifluoroethane, fluoroethane, propadiene, cyclopropane, or mixture, total mole concentration is 5%-25%; fifth group includes 1-butylene, isobutane, 2-methylbutane, 1-pentene, 3-methyl-1-butylene, 2-methylpentane, 2-butylene, isobutylene, n-butane, perfluorobutane, n-pentane or mixture, total mole concentration is 5%-25%.

Compounds and methods for preparing substituted 3-(1-amino-2-methylpentane-3-yl)phenyl compounds from an isomerically pure starting material are described. In particular, methods of preparing a 3-(1-(dimethylamino)-2-methylpentane-3-yl)phenol as a substantially optically pure (R,R) stereoisomer are described. Using a method of the present invention, only the (R,R) and (S,S) stereoisomers of the target compound are produced, increasing the yield and stereoselectivity of the desired (R,R) stereoisomer.

The invention discloses a separating method of methyl isobutyl ketone synthesized by acetone, which is characterized by the following: increasing acetone extracting and recycling step based on four-tower flow path; recycling acetone in the 2-methyl pantane / acetone azeotropic material; reducing the consumption of acetone and manufacturing cost; improving product competitive power and economic benefit.

The invention discloses a method for preparing perfluoro-2,3-epoxy-2-methylpentane. The method comprises the following steps: a) providing a mixed solution of perfluoro-2-methyl-2-pentene, an oxidation catalyst and a reaction medium; b) controlling the reaction temperature and the pressure, inflating oxygen, and synthesizing by a molecular oxygen oxidation method to obtain the perfluoro-2,3-epoxy-2-methylpentane. By the method, the reaction yield is high; the reaction medium can be repeated for many times, so that the waste liquid production is greatly reduced; the way is environmentally friendly.

Provided is a lubricating oil for continuously variable transmissions characterized by that used as a base oil are a synthetic oil I having the following properties: (a) a traction coefficient at 120°C is 115 % or more of that of 2,4-dicyclohexyl-2-methylpentane, (b) a viscosity at -40°C is not higher than a viscosity (260 Pa·s) of 2,4-dicyclohexyl-2-methylpentane and (c) a viscosity index is 65 or higher and a synthetic oil II having a viscosity of 1 Pa·s or lower at - 40°C and that the above base oil has a specific property. The above lubricating oil is a lubricating oil for continuously variable transmissions which has a high traction coefficient even at high temperature and is endowed with a good low temperature fluidity and which is suited as a lubricating oil for continuously variable transmissions for automobiles.