Joe D. Sauer

Isosucrose. Definitive structural assignment by spectral correlation to α,β- and α,α-sucrose octaacetates

Abstract Three nonreducing disaccharides containing D -glucosyl and D -fructosyl groups, namely, “isosucrose” octaacetate ( 3 ), sucrose octaacetate ( 4 ), and “α,α-sucrose” octaacetate ( 5 ), give qualitatively identical mass spectra and are, therefore, related as diastereoisomers. Spin-coupling values in the 300-MHz n.m.r. spectra of 3 , 4 , and 5 establish that the D -glucopyranosyl group is present in the 4 C 1 ( D ) conformation, and that the anomeric configuration of this group is α in 4 and 5 , and β in 3 . In the n.m.r. spectra, the H-4 atom of the D -fructofuranosyl group of 3 and 5 resonates 0.5 p.p.m. upfield of the corresponding signal of 4 , from which it was deduced that both 3 and 5 are α- D -fructofuranosides.

Synthesis of buta-1,2,3-trienes possessing the 2-pyridyl unit, and a new synthesis of P2I4

The first examples of cumulenes which possess the 2-pyridyl unit have been prepared; isomeric 1,4-diphenyl-1,4-di-(2-pyridyl)butatrienes, as well as tetra-(2-pyridyl)butatriene, have been characterized.