Hydroboration. IX. The Hydroboration of Cyclic and Bicyclic Olefins—Stereochemistry of the Hydroboration Reaction The hydroboration of 1-methylcyclopentene, 1-methylcyclohexene and 1-phenylcyclohexene, followed by oxidation with alkaline hydrogen peroxide, yields the pure (>99%) trans-2-methyl...
The hydroboration of π cyclopentadienyl(6,7-dihydro-π-indenyl)iron affords (after oxidation) a considerable amount (34%) of π-cyclopentadienyl( endo-4,5,6,7-tetrahydro-4-hydroxy-π-indenyl)iron. This stereochemical result is a proof of the preliminary complexation of the borane with iron. ...
If substituents are on thesame side of the double bondof the dienophile they will be on thesame side of the product ring. If substituents are onopposite sides of the double bondof the dienophile they will be onopposite sides of the product ring. ...
Interactive 3D animations of Diels-Alder reaction with Z,Z diene - stereochemistry and mechanism for students studying University courses
Hydroboration of the resulting homoallyl alcohol 9 afforded only the undesired epimer 10, which was ultimately converted into target 3 by a sequence of oxidation, epimerization, and reduction steps. 1H NMR comparison of the MTPA esters derived from compound 3 with those from natural calopin ...
1A specimen of stereospecifically 2-tritiated 3-hydroxybutyric acid was prepared by hydroboration of ethyl crotonate. It was assumed that the hydroboration reaction took a syn course and hence that (2R,3S) + (2S,3R)-3-hydroxy[2-3H1]butyric acid was formed after oxidation and hydrolysis.23...
Diastereomeric alcohols could be obtained by reduction of 8a , b and 11 and by hydroboration/oxidation of the fencholenic compounds 7 and 22 . The stereochemistry of the new compounds is described.Sprung, I.Anhalt, K.Schulze, K.MONATSHEFTE FUR CHEMIE...
We confirm the previously revised stereochemistry of spiroviolene by X-ray crystallographically characterizing a hydrazone derivative of 9-oxospiroviolane, which is synthesized by hydroboration/oxidation of spiroviolene followed by oxidation of the resultant hydroxy group. An unexpected thermal boron ...
ChemInform Abstract: New Chiral Synthon from Bromoethylbenzene: Absolute Stereochemistry of a Biooxidation Metabolite (II)cyclohexane derivativesbiochemical syntheses, microbiological syntheseshydroxylation, hydroboration, phosphorylation, silylationstereochemistry (general, optical resolution...
Interactive 3D animations of Diels-Alder reaction with E,E diene - stereochemistry and mechanism for students studying University courses