245 reported on the synthesis of linear but alsobranched polymers prepared by di-, tri-, and tetra-alkyne andazide monomers like the combination of tripropargylamine(B 3)and(dihydroxymethyl)(diazidomethyl)amine(A 2)(com-pare the general outline in Scheme 17).
When discussing mineral formations in caves, we often talk about stalactites and stalagmites. A stalactite is an icicle-shaped formation that hangs from the ceiling of a cave, and is produced by precipitation of minerals from water dripping through the cave ceiling. Most stalactites have pointed tips.
Water from the end of the stalactite leaves more calcite in a pile on the cave floor, and pretty soon a cone-like stalagmite forms. Thatâs why stalactites and stalagmites are usually found in pairs. Sometimes they grow together to form a pillar or column.ne way to remember is that stalactite has a âcâ in it, as in âceiling,â and stalagmite has a âgâ in it, as in âground.â. At least itâs easy to see the difference between stalactites and stalagmites, which are also called dripstone.