DBEDBE— Double bond equivalent; CC— Number of carbon atoms; HH— Number of hydrogen atoms; XX— Number of halogen atoms; and NN— Number of nitrogen atoms. How to calculate the double bond equivalent Now that we know the DBE formula, we can easily calculate the double bond equivalent fo...
A compound having any one or more of a maleimide structure and a maleic anhydride structure is dissolved in a solvent and then reacted with a known amount of thiol in the presence of a basic catalyst to obtain the amount of remaining thiol by a nitrogen titration method. .. This titration...
在英语 词典里double bond的定义 字典中双键的定义是由连接分子中两个原子的两个共价键组成的一种化学键。 像DOUBLE BOND一样开头的英语单词 double back·double bar·double bass·double bassoon·double bed·double bedroom·double bill·double bind·double bluff·double boiler·double bounce·double bridle·...
Ammonia is acovalent compoundbecause of the electronegativity difference between hydrogen and nitrogen atom ie; 0.9. Nitrogen and hydrogen atoms share their electrons with each other to form a single covalent bond resulting in the formation of a covalent NH3 compound. ... Thus, it makes ammonia a...
Solvents with other oxidizable heteroatoms (nitrogen and sulfur) are not suitable because of their affinity for oxygen. Toluene is particularly preferred. It is particularly preferable for the reaction to be carried out in a two-phase system, the alcohol being provided in an organic solvent and ...
1c)1,5. Indeed, a diverse set of methodologies have been developed to introduce nitrogen atoms attached the same substituents onto carbon–carbon double bond, i.e., diazidation and homodiamination reactions in metal-assisted6,7, metal-catalyzed8,9,10,11,12,13, organoselenium-catalyzed14, ...
After removal of the chloroform with a gentle stream of nitrogen, the alkylthiolation of the double bond was carried out according to the method of Shibahara et al. [68]. Therefore, 200 μL of an iodine/dimethyl disulfide solution (13 mg/mL) was added and heated (35 °C, 30 min). ...
Although the presence of a triple bond at C4 had little effect on the packing relative to a 4-trans double bond in the natural sphingoid base (Fig. 2), moving the nitrogen-containing group to C3 and the hydroxy group to C2 caused the molecular area to increase by ∼4.5 Å2. The ...
These compounds exhibited several types of structural variation, including ring-chain tautomerism, cis–trans isomerism with respect to the substituents in the pyrazole ring, and E/Z rotamerism with respect to the nitrogen–carbon hydrazide bond with partial double-bond character (Section 12.10.4.2)...
A portion of this acid is diluted respectively with a basic reagent which may be either alcoholic KOH or dilute sodium ethylate, and is then refluxed under a constant flow of nitrogen. Conjugation is produced after a relatively short period of refluxing as may be shown by suitable analysis. ...