Journal ArticleDOI
A Stereochemical and Kinetic Study of the Conversion of Methyl Cyclopropyl Ketones to 4,5-Dihydrofurans
TLDR
The thermal and photochemical conversion of (1R*,2R*,3S*), (1S*, 2R*, 3S*) and 1-acetyl-1,2-dimethyl-3-phenylcyclopropane (1, 2, and 3) to cis-and trans-2, 3, 4, 4-trimethyl-5, 5, 6, 7, 8-d...Abstract:
The thermal and photochemical conversion of (1R*,2R*,3S*), (1S*,2R*,3S*), and (1S*,2R*,3R*)-1-acetyl-1,2-dimethyl-3-phenylcyclopropane (1, 2, and 3) to cis- and trans-2,3,4-trimethyl-5-phenyl-4,5-d...read more
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Journal ArticleDOI
Ring opening and enlargement of cyclopropyl trimethylsilyl ketones by acids
TL;DR: In this article, the reaction of a series of cyclopropyl trimethylsilyl ketones with acids proceeds under milder conditions compared to that of their carbon analogs to give either the ring opening products or ring enlargement products.
Journal ArticleDOI
Benzopyrans. 31. Reaction of 1,1-diacetyl-2-(6-methyl-4-oxo-4H-1-benzopyran-3-yl)ethylene with phenyldiazomethane
Chandra Kanta Ghosh,S. Sahana +1 more
TL;DR: Phenyldiazomethane yields with the title alkene 1 a mixture of the transcyclopropane 6, benzopyran 8, pyrazole 9, and cis -dihydrofuran 12 as mentioned in this paper.
Journal ArticleDOI
Alkene-assisted cis-to-trans isomerization of non-conjugated polyunsaturated alkenes.
TL;DR: Using a combination of multinuclear NMR spectroscopic evidence and mathematical methods, the extent of trans isomerization was determined via an alkene-assisted mechanism in which one cis-double bond always served as an anchoring site.
Journal ArticleDOI
The protein topography of the E. coli 30S ribosomal subunit: a preliminary model E. coli/30S subunit/ribosome/spatial arrangement of proteins.
TL;DR: A three dimensional model is presented which shows the spatial arrangement of 20 of the 21 proteins of the 30S ribosomal subunit of Escherichia coli, suggesting an interesting correlation between stoichiometry and function.
Journal ArticleDOI
Topography of Escherichia coli ribosomal protein L12 in situ.
TL;DR: The reactivities indicate that the aminoterminal region of residues 1--59 undergoes a pH-dependent conformational change on the 50-S subunit.