磷酸酐键
In other terms, the oxygens are representative and the bonds leading off them are the strict requirements, but everything else can be shown as something else. In other special cases, the oxygen compounds are also swapped out for sulfurs, but this case is very rare, and the bond structure ...
Anhydride is defined as a class of compounds in chemistry where monomer units are linked via an anhydride bond, (RC(O))2O. These compounds are known for their biodegradability and are used in drug delivery and biomedical devices due to their ability to degrade into non-toxic products in vivo...
Two acid carbonyl groups and a double bond appear in its formula, which make it useful for broad industrial applications. Manufacturing processes for maleic anhydride include those using fixed-, fluidized-, and transport-bed technologies for selective oxidation of butane. View chapterPurchase book ...
in the presence of a phase-transfer catalyst (e.g. trimethylbenzyl ammonium halide). Preferably, the molar ratio of (B+C+D)/A is 0.8-1.2 and that of (C+D)/A is 0.001-0.3.;COPYRIGHT: (C)1993,JPO&JapioOWAKI TAKAMASAMOTOYAMA AKIOYASUE KENJIKISHIMOTO SOICHIROMIYAKE MUNEHIRO...
The selectivity of the process reflects the robustness of maleic anhydride, with its conjugated double-bond system. Traditionally maleic anhydride was produced by the oxidation of benzene or other aromatic compounds. As of 2006, only a few smaller plants continue to use benzene. ...
from 1H-NMR and IR spectra it can be deduced that stannous 2-ethylhexanoate coordinates with the anhydride bond of the ring, and that the resulting species reacts with the monomer by ring-opening of the acyl-oxygen bond. These observations indicate a non-ionic insertion polymerization mechanism ...
If the carboxylic acid contains a carbon-carbon double bond, the ending is changed from -anoic acid to -enoic acid to indicate the presence of the double bond, and a number is used to show the location of the double bond. Most simple carboxylic acids, rather than being called by their ...
Its basic structure consists of a cyclic anhydride with two carbonyl groups attached to a carbon-carbon double bond. This compound is sparingly soluble in water. Maleic Anhydride is a hazardous substance and should be handled with care. It may cause irritation to the skin, eyes, and respiratory...
Hydrogen Bond Donor Count:2 Hydrogen Bond Acceptor Count:8 Topological Polar Surface Area:127 Heavy Atom Count::20 Defined Atom Stereocenter Count:0 Undefined Atom Stereocenter Count:1 Defined Bond Stereocenter Count:0 Undefined Bond Stereocenter Count:0 Isotope Atom Count:0 Covalently-Bonded Unit...