Results 251 to 260 of about 108,684 (302)
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2009
Reaction of a phenyl ring with a diazoacetic ester to give a cyclohepta–2,4,6– trienecarboxylic acid ester. Intramolecular Buchner reaction is more useful in synthesis. Cf. Pfau–Platter azulene synthesis.
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Reaction of a phenyl ring with a diazoacetic ester to give a cyclohepta–2,4,6– trienecarboxylic acid ester. Intramolecular Buchner reaction is more useful in synthesis. Cf. Pfau–Platter azulene synthesis.
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Ring expansions and contractions of metalloporphyrins
Dalton Transactions, 2008Ring expansions or contractions of metalloporphyrins are unusual reactions. In this review, the author will show how the step by step analysis of two serendipitous reactions allows one to unveil their mechanism and to point out the key role of nickel ion in these rearrangements.
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Synthesis and Ring Expansions of Functionalized Spirocyclobutanones
Organic Letters, 2007The first condensations between bis(trimethylsilyloxy)cyclobutene derivatives and functionalized orthoesters are reported. The resulting adducts are readily converted into spirocycloethers, which undergo a variety of -CH2- and -O- insertions with excellent regioselectivity.
Nuno, Maulide, István E, Markó
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A ring expansion reaction of 1,3-oxathiolanes
Chemical Communications, 20021,3-Oxathiolanes are efficiently converted, via sulfur ylide intermediates, to 1,4-oxathianes by ring expansion with a silylated diazoacetate in the presence of a copper catalyst.
Maria, Ioannou +2 more
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Ring expansions. II. Diazoethane ring expansion of norcamphor
The Journal of Organic Chemistry, 1973Michael A. McKinney, Parmanand P. Patel
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Ring-Expansion of Ketones with [1.1.1]Propellane
Journal of the American Chemical SocietyHere, we present an approach for the ring-expansion of ketones, enabled by the rare electrophilic activation of [1.1.1]propellane. A broad spectrum of ketones was examined, showcasing excellent compatibility with various functional groups such as ester, amide, and amines. The novel reaction is practical and scalable (up to 56 g).
Ganesh Arjun Kadam +5 more
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