5-O-(tert-Butyldimethylsilyl)-2,3-o-isopropylidene-D-ribonic acid-lactone

5-o-t-butyldimethyl silyl-2,3-o-isopropylidine-d-ribonolactone ; 5-o[(1,1-dimethylethyl)dimethylsilyl]-2,3-o-(1-methylethylidene)-d-ribonic acid, gamma-lactone ; 5-o-(tert-butyldimethylsilyl)-2,3-o-isopropylidene-d-ribonic acid gamma-lactone ; 5-o-(t-butyldime.silyl)-2,3-o-isoprop.-d-ribonic ac. g-lact ; 5-o-(t-butyldimethylsilyl)-2,3-o-iso-propylidene- ; 5-o-(t-butyldimethylsilyl)-2,3-o-iso-pro pylidene-d-ribonic g-lactone, 97% ; 5-o-(tert-butyldimethylsilyl)-2,3-o-isopropylidene-d-ribonic acid γ-lactone ; d-ribonic acid, 5-o-[(1,1-dimethylethyl)dimethylsilyl]-2,3-o-(1-methylethylidene)-, .gamma.-lactone ; 5-o-tert-butyldimethylsilyl-2,3-o-isopropylidene-d-lyxono-1,4-lactone