Abstract: New compounds, 2',3'-dideoxy-2'-fluorokanamycin A and 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl) derivatives thereof, particularly 1-N-(DL- or L-3-amino-2-hydroxypropionyl)- and 1-N-(L-4-amino-2-hydroxybutyryl)-2',3'-dideoxy-2'-fluorokanamycins A are now provided, which are each useful as antibacterial agent. 2',3'-Dideoxy-2'-fluorokanamycin A is prepared by a process comprising condensing a 6-azido-4-O-protected-2,3,6-trideoxy-2-fluoro-.alpha.-D-ribo-hexopyranosyl bromide with the 4-hydroxyl group of a 6-O-(2',4',6'-tri-O-protected-3'-N-protected-3'-amino-3'-deoxy-.alpha.-D-g lucopyranosyl)-1,3-bis-N-protected-2-deoxystreptamine, reducing the resulting condensation product to convert its azido group into an amino group, and removing the remaining amino-protecting and hydroxyl-protecting groups from the reduction product.

Abstract: A briquette, preferably intended for use as additional combustible in shaft furnaces for melting of mineral in mineral wool manufacture and comprising 30-75% of a combustible in the form of coal and/or coke, 8-35% of a hydraulic binder like cement and 15-35% of a filler in the form of a fine grain, oxidic, mineral component like sand, slag, stone powder, fly ash, lime stone powder, dolomite powder, silicon dioxide or a fibrous waste material from the mineral wool manufacture.