Isopropyl alcohol

About: Isopropyl alcohol is a research topic. Over the lifetime, 3064 publications have been published within this topic receiving 27354 citations. The topic is also known as: Rubbing Alcohol & Propan-2-ol.

Behavior of four sulfonylurea herbicides in the presence of hydroxy compounds.

Abstract: The behavior of four sulfonylurea herbicides (metsulfuron methyl, chlorsulfuron, chlorimuron ethyl, and bensulfuron methyl) was studied in the presence of various hydroxy compounds. When dissolved at 30 degrees C in simple primary, secondary, or tertiary alcohols (methanol, ethanol, isopropyl alcohol, and tert-butyl alcohol) and in glycerol or in poly(ethylene glycol), most of these herbicides underwent rapid alcoholysis involving the breakdown of the urea part of the molecule. The corresponding sulfonyl carbamate is recovered in high yields, along with a small amount of sulfonylamide formed in the concomitant hydrolysis. Degradation rate constants and the selectivity of conversion were established. The addition of buffered water (pH 7.0) inhibited the alcoholysis reaction, leaving only hydrolysis, as already observed with concentrated saccharide solutions. In phenol solution, slight herbicide hydrolysis was primarily observed. It appeared that alcoholysis reactions only occurred under very particular conditions when sulfonylurea herbicides are dissolved in pure alcohols, without buffered water. These results led to the conclusion that in soil, similar alcoholysis reactions seem unlikely.

Method for determining component in urine

Abstract: PURPOSE:To determine hippuric acid (HA), 0-methyl hippuric acid (MHA), m-MHA, P-MHA, and mandel acid (MA) in urine rapidly and simply using an aqueous solution containing a specific aqueous solution alcohol as an elutant. CONSTITUTION:The HA, o-MHA, m-MHA, p-MHA, and MA inside urine are determined using an aqueous solution containing an aqueous alcohol with two or more carbons as an elutant by a high-speed liquid chromatography (HPLC) using a column where octadecyl silica gel (ODS) is filled. Examples of aqueous solution alcohol with two or more carbons are ethyl alcohol, isopropyl alcohol etc. The concentration inside the elutant of alcohol is normally 2-20V/V%. Urine which is diluted by water and alcohol is poured into the HPLC device in that the column where ODS is filled and which is balanced by the elutant is fitted, the elutant is allowed to flow at a specific temperature and flow rate, and then the peak of HA, etc., to be exuded is detected by an ultraviolet spectrophotometer, etc. The concentration of HA, etc., inside the specimen is determined by fitting to the concentration of the HA, etc., and the calibration curve of the peak area which are created previously.

Hydrogenation of acetone on technetium catalysts

Abstract: The catalytic properties of supported mono- and bimetallic catalysts of the Tc/support, M/support, and M-Tc/support types (M=Pt, Pd, Rh, Ru, Ni, Re, Co; supports are γ-Al2O3, MgO, SiO2) were investigated in the acetone hydrogenation. The main products of this reaction are isopropyl alcohol and propane. The catalytic activity in the acetone hydrogenation of the metals studied decreases in the consequence Pt>Tc≈Rh>Pd>Ru >Ni≈Re>Co (with γ-Al2O3 as the support). The influence of support nature on the catalytic activity was investigated for the Rh−Tc system as an example. A nonadditive increase in the catalytic activity of Rh−Tc/γ-Al2O3 in comparison with monometallic catalysts was found. The state of the surface of the catalysts was characterized by the UV-VIS diffuse reflectance spectra.