benzyne वाक्य
उदाहरण वाक्य
मोबाइल
- Para-benzyne is able to position itself in such a way that it can abstract proximal hydrogens from both strands of DNA . This produces a double-strand break in the DNA, which can lead to cellular apoptosis if not repaired.
- In 1988 Nam and Leroy reported the matrix isolation ( 13K, Ar ) of 3, 4-pyridyne by photolysis of 3, 4-pyridinedicarboxylic anhydride with the IR-spectrum revealing an acetylenic bond in the same way as ortho-benzyne.
- Amongst the many and diverse contributions to chemistry he made, his two papers describing the brilliantly conceived generation of benzyne and [ 1, 8 ]-dehydronaphthalene by the lead ( IV ) acetate oxidation of N-amino heterocycles are considered classic papers from this era.
- Benzyne is generated in situ from a benzene compound attached to a triflate and a trimethylsilyl substituent in the ortho-positions and reacts with a di-yne such as 1, 7-octadiyne along with a nickel ( II ) bromide / zinc catalyst system ( NiBr 2 bis ( diphenylphosphino ) ethane / Zn ) to synthesize the corresponding naphthalene derivative.
- "' 1, 2, 3, 4-Tetraphenylnaphthalene "'is a polycyclic aromatic hydrocarbon commonly prepared in the undergraduate teaching laboratory as an introduction to the Diels-Alder reaction, in this case between benzyne, which acts as the dienophile, ( generated " in situ " ) and tetraphenylcyclopentadienone, which acts as the diene.
- The non-protein component is a very potent DNA-damaging agent; However it is extremely unstable and the role of the protein is to protect it and release it to the target DNA . Opening of the epoxide under reductive conditions present in cells creates favorable conditions for a Bergman cyclization, that leads to formation of benzyne, Followed by DNA strand cleavage.
- The next member is "'[ 6 ] annulyne "'or benzyne which is a reactive intermediate well known in organic chemistry . "'[ 8 ] annulyne "'is known to exist but quickly dimerizes or trimerizes; the compound has been trapped as its EPR spectroscopy . "'[ 10 ] annulyne "', like [ 4 ] annulyne, only exists in theory.
- Some examples include developing ( a ) a continuous protocol for the two-carbon homologation of esters to prepare ( a ) ?-unsaturated esters with high yield and selectivity; ( b ) 2-functionalized phenols via benzyne-mediated in-line generation of arylmagnesium intermediates and aerobic oxidation; ( c ) developing a three-step continuous flow system which integrates in-line isocyanide formation and photochemical cyclization for preparing quinoxaline derivatives and ( d ) a two-step glycosylation and deprotection sequence to prepare 5-deoxyribonucleoside pharmaceuticals.
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