4809-94-3Relevant academic research and scientific papers
Nickel-catalyzed reductive deoxygenation of diverse C-O bond-bearing functional groups
Cook, Adam,MacLean, Haydn,St. Onge, Piers,Newman, Stephen G.
, p. 13337 - 13347 (2021/11/20)
We report a catalytic method for the direct deoxygenation of various C-O bond-containing functional groups. Using a Ni(II) pre-catalyst and silane reducing agent, alcohols, epoxides, and ethers are reduced to the corresponding alkane. Unsaturated species including aldehydes and ketones are also deoxygenated via initial formation of an intermediate silylated alcohol. The reaction is chemoselective for C(sp3)-O bonds, leaving amines, anilines, aryl ethers, alkenes, and nitrogen-containing heterocycles untouched. Applications toward catalytic deuteration, benzyl ether deprotection, and the valorization of biomass-derived feedstocks demonstrate some of the practical aspects of this methodology.
Enantiodivergent Pd-catalyzed C–C bond formation enabled through ligand parameterization
Zhao, Shibin,Gensch, Tobias,Murray, Benjamin,Niemeyer, Zachary L.,Sigman, Matthew S.,Biscoe, Mark R.
, p. 670 - 674 (2018/11/01)
Despite the enormous potential for the use of stereospecific cross-coupling reactions to rationally manipulate the three-dimensional structure of organic molecules, the factors that control the transfer of stereochemistry in these reactions remain poorly understood. Here we report a mechanistic and synthetic investigation into the use of enantioenriched alkylboron nucleophiles in stereospecific Pd-catalyzed Suzuki cross-coupling reactions. By developing a suite of molecular descriptors of phosphine ligands, we could apply predictive statistical models to select or design distinct ligands that respectively promoted stereoinvertive and stereoretentive cross-coupling reactions. Stereodefined branched structures were thereby accessed through the predictable manipulation of absolute stereochemistry, and a general model for the mechanism of alkylboron transmetallation was proposed.
Synthesis of Organolithium Compounds from Phenyl Selenides
Krief, Alain,Nazih, Abdesslame,Hobe, Myriam
, p. 8111 - 8114 (2007/10/02)
Alkyl aryl selenides react with lithium arenides to produce, regioselectively, alkyllithiums and lithium arylselenolates.Experimental conditions, especially the temperature, have a profound effect on the course of this reaction and on the nature of the products.
Photocleavage of Benzyl-Sulfide Bonds
Fleming, Steven A.,Jensen, Anton W.
, p. 7135 - 7137 (2007/10/02)
The nucleoside transport inhibitor 6--9-(β-D-ribofuranosyl)purine, NBMPR, has been used successfully in photoaffinity labeling.We have studied the mechanism for photocleavage of the benzyl-sulfur bond by using substituted benzyl phenyl sulfides as analogues of NBMPR.This has enabled us to enhance the photoreactivity of the benzyl-sulfur bond.We have also performed "radical clock" studies with a hexenyl side chain to trap reactive intermediates.The mechanistic interpretation from the substituent and side chain studies is that the benzyl-sulfur moiety is photocleaved via a homolytic pathway.
Stereochemistry of the thermal isomerizations of (1/R,2R)-1-((E)-Styryl)-2-methylcyclopropane to 3-phenyl-4-methylcyclopentenes
Baldwin, John E.,Bonacorsi Jr., Samuel
, p. 10621 - 10627 (2007/10/02)
(1A,2R)-1-((E)-Styryl)-2-methylcyclopropane at 250 °C racemizes and isomerizes to 6-phenylhexa-1,4-(Z)-diene and to the four isomers of 3-phenyl-4-methylcyclopentene. From the measured rate constants for racemization and for structural isomerizations, and
The importance of conformation in the reactivity of radical cations. Changing configuration at saturated carbon centres
Perrott, Allyson L.,Arnold, Donald R.
, p. 272 - 279 (2007/10/02)
Irradiation of an acetonitrile solution of cis-1-methyl-2-phenylcyclopentane (1b cis); 1,4-dicyanobenzene (2), an electron-accepting photosensitizer; and 2,4,6-collidine (3), a nonnucleophilic base, leads to configurational isomerization of the cyclopenta
Original Syntheses of Arylcycloalkanes
Krief, Alain,Barbeaux, Philippe
, p. 1214 - 1216 (2007/10/02)
Arylcycloalkanes have been prepared from acetophenone by a three-step sequence involving the synthesis of α-phenyl(ω-alkenyl)methylselenides and their reaction with butyl-lithium reagents to give an intermediate which adds across the C=C double bond to gi
Acid-catalyzed Reactions of Aromatic Hydrocarbons with Alkanes and Cycloalkanes. X. Alkylations with Cyclohexane
Miethchen, Ralf,Steege, Sigrid,Kroeger, Carl-Friedrich
, p. 823 - 834 (2007/10/02)
The complex reaction mixtures of the nonconventional alkylation of benzene with cyclohexane in the presence of Lewis/proton acids and promotors were investigated by gas-liquid chromatography and mass spectrometry.Four representative groups of hydrocarbons were found including cycloalkylbenzenes, substituted indanes or tetralines (C12H16), C1-C6-alkylbenzenes and isomeric biscycloalkyls (C12H22).Their formation is interpreted as a competition between alkylation, (without or with isomerization), ringfission with cycloalkylation or fragmentation, and self-alkylation; phenylcycloalkylcations and phenylalkylcations are the intermediates.
