Bromine number, or bromine index, is a parameter used to estimate the amount of unsaturated aliphatic groups (olefins) in a hydrocarbon. The double C=C bonds can crosslink or react with oxygen to form epoxides, which are highly reactive. The crosslinking causes the hydrocarbon to form long c...
The magnitude of the bromine number issimply an indication of the bromine reactiveconstituents, not an indication of the constituents. The bromine number mainly indicates the concentration of double bonds present in the product.CONTINUOUS IP
In this paper,the total number of double bond in PVC was determined by bromine addition,with mercuric acetate as catalyst.The correlation between the total number of double bond in PVC and the thermal stability of PVC was studied.The total number of double bond was determined for six PVC samp...
Peroxide-curable fluoroelastomers and chlorofluoroelastomers are prepared in the presence of iodinated compounds, with iodine bonding to a substantial number of terminal positions on the fluoroelastomer, and comprising up to 3 weight per... Moore Albert Lloyd - US 被引量: 96发表: 1990年 ...
Thus, treatment of 2- and 5-bromothiazoles with butyllithium affords 2- and 5-lithiothiazoles, respectively. The reaction with 4-bromothiazole under the same conditions leads exclusively to deprotonation at C-2 〈88JOC1748〉, although a number of substituted 4-bromothiazoles react with ...
Using differences in electronegativity, rank the following bonds from the one with the least ionic character to the one with the most ionic character. 1) Cs-F 2) Sr-Cl 3) Al-O 4) Li-N What is CCl4's boiling point? What is the atomic number of fluorine? What is the general trend ...
Bromine, a member of the halogen family, is a minor component in geochemistry with low concentration in the crust and few mineral forms. Discovered by Balard in 1826, bromine was first prepared in quantity in 1860. Chemistry Bromine has an atomic number of 35, average atomic mass of 79.904,...
A linear correlation between the spin—spin carbon—carbon coupling constants and the carbon—carbon stretching force constants for triple bonds has been f... K Kamieńska-Trela - 《Journal of Molecular Structure》 被引量: 50发表: 1982年 Spin-spin coupling constants between carbon-13 and bromin...
In forming chemical bonds, the negatively charged particles surrounding the nucleus (electrons) are responsible. The octet rule refers to the tendency of atoms to fill its valence shell with 8 electrons when forming a chemical bond with other atoms....
The selectivity is mainly controlled by the ratio between the number of tertiary C–H bonds and secondary C–H bonds present in the substrate. When there were more secondary C–H bonds present in the substrate, the selectivity was decreased to some extent (3, 4, and 8). Alkanes bearing ...