The reaction displays high diastereo- and regio-selectivity. 31 P NMR studies showed the formation of an intermediate hemiacetal and rapid formation of the organomercurial upon addition of mercuric trifluoroacetate. However, the oxymercuration was reversible, and attempts to remove the excess aldehyde ...
Acetals are geminal-diether derivatives of aldehydes or ketones, formed by reaction with two equivalents (or an excess amount) of an alcohol and elimination of water. Acetals are stable compared to hemiacetals but their formation is a reversible equilibrium as with esters. ...
Oxidation, Substitution and Addition Alkanes Arenes Alkenes Dienes Alkynes Alkyl Halides Amines Imines and Derivatives Azides Nitro Compounds Nitrothioalkenes Ethers Sulfides Alcohols Diols Amino Alcohols Azido Alcohols Phenols Aldehydes and Derivatives Ketones Hemiacetals and Lactols Acetals Carboxylic Acids ...
SmI2-Mediated Radical Cross-Couplings of alpha-Hydroxylated Aza-hemiacetals and N,S-Acetals with alpha,beta-Unsaturated Compounds: Asymmetric Synthesis of ... The SmI2-mediated radical coupling reactions of beta-hydroxylated pyrrolidine/piperidine aza-hemiacetals 8 and 9 and N,S-acetals 6 and 33...
We have determined that SOA forms from the heterogeneous/multiphase oligomerization of primary reaction products to form esters, hemiacetals, and acetals, and not through second-generation reactions. Chapter 4 discusses the chemical composition of SOA formed from the reaction of m-xylene and how the...
Are they acetals or hemiacetals? They are acetals. In both cases, the carbon has two OR group attached. There is no free OH group. Is this sugar reducing or non-reducing? Non-reducing since the anomeric carbons has acetal groups. ...
The reaction displays high diastereo- and regio-selectivity. 31 P NMR studies showed the formation of an intermediate hemiacetal and rapid formation of the organomercurial upon addition of mercuric trifluoroacetate. However, the oxymercuration was reversible, and attempts to remove the excess aldehyde ...
A reversible formation of hemiacetals represents a usefultool in covalent dynamic chemistry. Heterocyclic hemi-acetals can be stabilized effectively via either protonationor metal cation coordination. The resulting hemiacetalsystems are highly dynamic, show fast response, anddisplay component selection.Dusan...
The conversion of α,β-unsaturated enones (6) to α,β-unsaturated acetals (7) is described. The formation is shown to proceed via displacement of H2O in the intermediate hemiacetal. Fumaric acid is shown to be the catalyst of choice for the reaction from 6 to 7.doi:10.1002/recl....
We have determined that SOA forms from the heterogeneous/multiphase oligomerization of primary reaction products to form esters, hemiacetals, and acetals, and not through second-generation reactions. Chapter 4 discusses the chemical composition of SOA formed from the reaction of m-xylene and how the...