Nevertheless, strained alkyne is a better description of the triple bond nature of ortho-benzyne than biradical ( larger singlet-triplet gap and alkyne-like reactivity ).
32.
The reaction is found to be first-order in enediyne with the formation of p-benzyne "'A "'as the rate-limiting step.
33.
Additionally, the HDDA reaction can be useful for substrates with sensitive functionality that might not be tolerated by other benzyne formation conditions ( e . g . strong base ).
34.
In the presence of DNA, the benzyne diradical abstracts hydrogens from the deoxyribose sugar backbone, predominantly at the C-1, C-4 and C-5 positions.
35.
The complex aromatic structure of the sporolides is hypothesized to be derived from an unstable nine-membered ring enediyne precursor, which undergoes Bergman cyclization to generate a p-benzyne intermediate.
36.
Additionally, part of the molecule is known as the trigger which, under specific physiological conditions, activates the enediyne, known as the warhead and p-benzyne is generated.
37.
Formally, the hexadehydro Diels-Alder reaction describes only the formation of the benzyne, but this species is an unstable intermediate that reacts readily with a variety of trapping partners, including reaction solvents.
38.
The vibrational frequency of the triple bond in benzyne was assigned by Rasziszhewski to be 1846 cm " 1, indicating a much weaker triple bond than in unstrained alkyne with vibrational frequency of approximately 2150 cm " 1.
39.
He worked at Michigan with Martin Stiles to observe the free benzyne in the gas phase, and then, at Yale, with a graduate student Margaret Emery and an undergraduate John Clardy, they found the meta and para isomers of benzyne.
40.
He worked at Michigan with Martin Stiles to observe the free benzyne in the gas phase, and then, at Yale, with a graduate student Margaret Emery and an undergraduate John Clardy, they found the meta and para isomers of benzyne.
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