title: Influence of protecting groups on the anomeric equilibrium; case of the 4,6-O-benzylidene acetal in the mannopyranose series.
abstract: It is reported that the replacement of the 4- and 6-O-benzyl ethers in 2,3,4,6-tetra-O-benzyl-α,β-mannopyranose by a 4,6-O-benzylidene acetal results in an increased population of the β-anomer at equilibrium in CDCl(3) solution. The phenomenon is considered to arise from the lower steric bulk of the benzylidene acetal that, through diminished buttressing interactions, reduces steric interactions normally present in the β-anomer.
authors: Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA.
authors: Indrajeet
authors: I
authors: Sharma
authors: Luis
authors: L
authors: Bohé
authors: David
authors: D
authors: Crich
mesh_terms: D000080:Acetals / Q000737:chemistry*; D000085:Acetates / Q000737:chemistry; D001597:Benzylidene Compounds / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002725:Chloroform / Q000737:chemistry; D008358:Mannose / Q000031:analogs & derivatives* / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D000080:Acetals; D000085:Acetates; D001597:Benzylidene Compounds; D012997:Solvents; D002725:Chloroform; D008358:Mannose