Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Using D-Xylose as a source of chirality at C-5 and C-12 in LTB 4 , an efficient synthesis of the optically active propargylic alcohols A and B, chiral precursors for the LTB 4 synthesis, has been achieved. ... An efficient synthesis of the optically active propargylic alcohols A and B, ...