Tritium-labeled compounds IV. D-glucose-6-t, d-xylose-5-t, and d-mannitol-1-t

M ethod.a rc prcs ntcd for t he preparat ion of o-glu cosc-6-t, o-xy lose-5-t, a nd D-ma nni tol-l-t b y t he reductio n of sui table compou nds th li thium boroh ydride-t in anh.vdr ous tctrah ydrofuran, fo llowed by hyd rolysis of t he products.The star ting materials for t he re du ct io n ~ a re, r especti vely, 1,2-0-isopl'op yliden e-D-glucurono-6,3-1acton e, 5-aldo-l ,2-0-isopropy liden e-D-xylo-pen tofurano se, a nd 2,3: 5,6-di-O-isopropyli clen e-D-mannofur a nosr.Thc apparatus and proceclure for carrying out the red uc tions in a closed system arc describcd.