divinyl sentence in Hindi
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- Leake discovered the anesthetic divinyl ether.
- The method is widely used for the synthesis of star shaped polystyrene with divinyl benzene with low molecular weight distributions.
- Chemically, it is a synthetic polymer of polyacrylic acid cross-linked with divinyl glycol, with calcium as a counter-ion.
- Allyls, acrylates and styrenics contain vinyl groups . ( A styrenic crosslinker with two vinyl groups is called " divinyl benzene " .)
- These oligotrophic organisms are abundant in nutrient poor tropical waters and use a unique photosynthetic pigment, divinyl-chlorophyll, to absorb light and acquire energy.
- The third route is through the addition of small amounts of cross linking agents to the polymeric precursor ( for example, addition of divinyl benzene to polystyryl lithium ).
- Shown below are key steps in the syntheses of Trichodiene and Nor-Sterepolide, the latter of which is thought to proceed via an unusual alkyne-allene isomerization that generates the divinyl ketone.
- A different representation : polyacrylic acid residues are shown in red, residues of the cross-linker divinyl glycol ( 3, 4-dihydroxy-1, 5-hexadiene ) in blue.
- For example, the amount of divinyl benzene added in the above pathway, compared to the number of active chains, is a key factor governing the overall degree of branching of the polymer.
- Even in an article in 1938 on cross-linking copolymerization of acrylic acid with divinyl he laid the foundation for the core technology of today as " superabsorbent " designated products, for example in diapers are widely used.
- In one study, [ 5 ] helicene was synthesized in an olefin metathesis reaction of a divinyl compound ( prepared from 1, 1'- bi-2-naphthol ( BINOL ) in several steps ), with Grubbs'second generation catalyst:
- It was stated that the action of heated sodium hydroxide upon ?, ? `-dichlorodiethyl ether produced a liquid boiling at 39 �C ( among other identified products ) . ( Major, 1935 ) However, in a subtly modified process Hibbert et al . reported the isolation of a product boiling at 34-35 �C, " divinyl ether ".
- As a functional group, the synthesis of 2-cyclopentenones is accomplished in a variety of other ways, including the Nazarov cyclization reaction from divinyl ketones, Saegusa Ito oxidation from cyclopentanones, ring-closing metathesis from the corresponding dienes, oxidation of the corresponding cyclic allylic alcohols, and the Pauson Khand reaction from alkenes, alkynes, and carbon monoxide.
- This substance produced results placing it between diethyl ether and divinyl ether both in terms of toxicity and speed of induction and recovery, producing promising results similar to V . A . M . ( Grosskreutz, Davis 1956 ) Despite much simpler synthesis ( vinylization of ethanol with acetylene ) ethyl vinyl ether didn't enter widespread use in anasthetics, as superior halogenated ethers replaced it shortly after its first trials.
- However, " Prochlorochoccus " has evolved to use a unique light-harvesting complex, consisting predominantly of divinyl derivatives of chlorophyll a ( Chl a2 ) and b ( Chl b2 ) and lacking monovinyl chlorophylls and phycobilisomes . " Prochlorococcus " is the only known wild-type oxygenic phototroph that does not contain Chl a as a major photosynthetic pigment, and is the only known prokaryote with ?-carotene.
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