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.
Meteorites are stony or metallic bodies that fall to the Earth from space. All meteorites show peculiarities not observed in known rocks of Earth, and it is therefore possible to recognize them even if they have not been seen to fall (see TESTING FOR SUSPECTED METEORITES).eteorites are stony or metallic bodies that fall to the Earth from space. All meteorites show peculiarities not observed in known rocks of Earth, and it is therefore possible to recognize them even if they have not been seen to fall (see TESTING FOR SUSPECTED METEORITES).