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title=Do Antarafacial Cycloadditions Occur? Cycloaddition of Heptafulvalene with Tetracyanoethylene|
url=https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/chem.202201418|
journal=Chemistry: A European Journal|volume=28 |issue=49 |pages=e202201418 |
doi=10.1002/chem.202201418|pmid=35671245 |url-access=subscription}}
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[[Image:Bpe-resorcinol-cycloaddition.png|right|thumb|Cycloaddition of ''trans''-1,2-bis(4-pyridyl)ethene]]
[[Supramolecular chemistry|Supramolecular effects]] can influence these cycloadditions. The cycloaddition of ''trans''-1,2-bis(4-pyridyl)ethene is directed by [[resorcinol]] in the [[solid-state chemistry|solid-state]] in 100% [[chemical yield|yield]].<ref>{{cite journal |author1=L. R. MacGillivray |author2=J. L. Reid |author3=J. A. Ripmeester | title = Supramolecular Control of Reactivity in the Solid State Using Linear Molecular Templates | year = 2000 | journal = [[J. Am. Chem. Soc.]] | volume = 122 | issue = 32 | pages = 7817–7818 | doi=10.1021/ja001239i|bibcode=2000JAChS.122.7817M }}</ref>
Some cycloadditions instead of π bonds operate through strained [[cyclopropane]] rings, as these have significant π character. For example, an analog for the Diels-Alder reaction is the [[quadricyclane]]-[[DMAD]] reaction:
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