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.
â¦Slovakia. It is the largest stalactite cave system in Europe, and its stalactite and stalagmite formations are spectacular. The caverns and their surroundings have been designated a national park by both Hungary and Slovakia, and the area was named a UNESCO World Heritage site in 1995.