Results 21 to 30 of about 1,032 (168)
Electrochemical Cycloaddition Reactions of Alkene Radical Cations: A Route toward Cyclopropanes and Cyclobutanes [PDF]
, 2023 Herein, we describe a mild and efficient electrochemical method for cycloaddition reactions of alkene radical cations. Anodic oxidation of olefins produces electrophilic alkene radical cations, which further react with either diazo compounds in a [2 + 1]
Kowaluk, Agnieszka +3 more
core +3 more sources
Angewandte Chemie, EarlyView.Catalyst‐controlled nitrene transfer unlocks divergent reactivity of bicyclo[1.1.0]butanes. Rhodium catalysis promotes selective strain‐release amination to access cyclobutene and cyclobutane amino‐acid scaffolds, whereas visible‐light photocatalysis redirects nitrene reactivity toward double amination and skeletal remodeling, providing a complementary
Aksar Ali +5 more
wiley +2 more sources
Angewandte Chemie, EarlyView.A photocontrolled RAFT strategy enables the alternating copolymerization of 1,3‐disubstituted bicyclo[1.1.0]butanes with electron‐deficient comonomers, affording well‐defined copolymers bearing strained cyclobutane backbones. A high degree of alternation, tunable molecular weights, and excellent end‐group fidelity are achieved through a CTA‐mediated ...
Xia Hu +4 more
wiley +2 more sources
Stereocontrolled Synthesis and Functionalization of Cyclobutanes and Cyclobutanones
Molecules, 2013 In the last decade a certain number of new cyclobutane and cyclobutanone synthesis and functionalization protocols have been published. Organo- and biocatalyzed eco-friendly approaches to cyclobutane-containing molecules have been developed with ...
Francesco Secci +2 more
doaj +1 more source
, 2016 Enantiomerically enriched cyclobutanes are constructed by a three-component process in which t-butyl (E)-2-diazo-5-arylpent-4-enoates are treated with Rh2(S-NTTL)4 to provide enantiomerically enriched bicyclobutanes, which can subsequently engage in ...
Joseph M. Fox (1287015) +5 more
core +3 more sources
Ring Tension, Hydrocarbon Acidity, and New «Super-Bases»
CHIMIA, 1986 Addition of disodium pinacolate or, particularly, potassium tert-butoxide considerably increases the transmetalating power of pentylsodium. A hexane slurry of such «NACNAOR» or «NACKOR» reagent mixtures readily and selectively converts 3,3-dimenthyl-1 ...
Manfred Schlosser +5 more
doaj +1 more source
Mass Spectrometry and Gas-phase Ion Chemistry of Cyclobutanes
, 2005 Kuck D. Mass Spectrometry and Gas-phase Ion Chemistry of Cyclobutanes. In: Rappoport Z, Liebman JF, eds. The Chemistry of Functional Groups: The Chemistry of Cyclobutanes. The Chemistry of Functional Groups.
Liebman, Joel F. +2 more
core +1 more source
r-1,t-3-Bis[4-(dimethylamino)phenyl]-c-2,t-4-bis(pyridin-4-yl)cyclobutane
Acta Crystallographica Section E, 2014 The title compound, C30H32N4, was synthesized by the photodimerization of trans-4-{2-[4-(dimethylamino)phenyl]ethenyl}pyridine in benzene upon irradiation with UV light.
Shuguang Zhang, Junpeng Zhuang
doaj +1 more source
Elimination versus ring opening: A convergent route to alkylidene- cyclobutanes
, 2011 International audienceFunctionalized alkylidene-cyclobutanes have been prepared from 2-fluoropyridinyl-6-oxy precursors derived from vinyl cyclobutanols by a radical addition-elimination process.
Michal Michalak +7 more
core +1 more source
Hypervalent iodine initiated intramolecular alkene dimerisation: a stereodivergent entry to cyclobutanes [PDF]
, 2019 The emergence of new methods for the stereoselective synthesis of strained carbocycles is a challenging but worthwhile endeavour. Cyclobutanes, in particular, have attracted the attention of both medicinal chemists and material scientists for their ...
Colomer, I +3 more
core +1 more source