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. ... A new preparation of furo-2,3b furans, and conformational studies by 2D NMR. ... Perhydro furo-2,3-b furan derivatives have been prepared by iodocyclisation of unsaturated lactols. Structure and conformation have been studied by high resolution “COSY” 2D NMR.