Spiro (2.2) pentane, the simplest triangulan Tetraspiro-2.0.0.0.2.1.1.1-undecane, a [5] triangulan
A triangulan is a synthetic organic compound consisting of a number of cyclopropane rings connected by a spiro compound, this is with one common carbon atom. The name Triangulaan was presented by Prof. Armin de Meijere of the University of Göttingen, who has done a lot of research into these and similar links.
A triangulan consisting of n cyclopropane units is referred to as [n] triangulan. The largest triangulan synthesized so far is a [15] triangulan.
Because the free vertices of a triangulan dodge each other, the molecule takes a spiral shape. The curvature of the spiral may be left or right, leaving a triangulan molecular chirality, although it has no asymmetric carbon atom. This phenomenon also occurs in helicens. Rotanen A [4] rotane, made up of a cyclobutane ring with four cyclopropane rings in spiro compound
A [n] rotane is a cyclic hydrocarbon with n carbon atoms, each of which is attached to a cyclopropane ring in a spiro compound. So far, [3] - to [6] rotans have been synthesized. The simplest rotan, [3] rotane, consists of a cyclopropane ring to which three other cyclopropane rings are attached as spiro compounds. It is thus a branched [4] triangulan.
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