The title compound was prepared by first converting trideuteriomethyl
2,3,4-tri-O-benzyl-beta-D-mannopyranoside to a 6-bromo-6-deoxy derivat
ive which on elimination by using DBU (1,8-diazabicyclo5.4.0!undec-7-
ene) or DBN (1,5-diazabicyclo4.3.0!non-5-ene) gave a hex-5-enopyranos
ide derivative. The deuteroboration of the hex-5-enopyranoside followe
d by oxidation and subsequent deblocking produced trideuteriomethyl 5-
deuterium-beta-D-mannopyranoside.