Abstract Efficient syntheses are described of the branched d-mannopentaosides methyl 2, 6- di-O-(2-O-α-d-mannopyranosyl-α-d-mannopyranosyl) α-d-mannopyranoside and methyl 2, 4- di-O-(2-O-α-d-mannopyranosyl-α-d-mannopyranosyl)-α-d-mannopyranoside, starting from the glycosyl acceptors methyl 3, 4-di-O-benzyl-α-d-mannopyranoside and methyl 3, 6-di-O- benzyl-α-d-mannopyranoside, and employing the protected d-mannotriosides methyl 3, 4- ...
