13 C‐selective, 1 H‐detected 2D { 1 H, 13 C} correlation spectra of oligosaccharides

Two‐dimensional 1 H‐detected { 1 H, 13 C} shift correlation spectra of oligosaccharides usually suffer from low resolution in the 13 C frequency domain. This drawback can be overcome through a simple modification of the HSQC experiment, namely by implementing a selective 13 C 180° pulse. It is illustrated for the mixture of the α‐and β‐anomers of the trisaccharide sialyl‐α(2→6)‐lactose that 13 C‐selective HSQC allows both one‐bond and multiple‐bond { 1 H, 13 C} correlation spectra to be obtained with high resolution in the 13 C domain.