The internal angles of a flat angle between successive bonds in a carbon chain is about 109.5? the tetrahedral angle.
2.
For a theoretical planar cyclopentane the C C C bond angles would be 108 degrees, very close to the measure of the tetrahedral angle.
3.
The H O H bond angle is with 104.5? less than the 109?predicted for a tetrahedral angle, and this can be explained by a repulsive interaction between the lone pairs.
4.
This double magic angle is directly related to Tetrahedral molecular geometry and is the angle from one vertex to the exact center of the tetrahedron ( " i . e . ", the edge central angle also known as the tetrahedral angle ).
5.
Both the crystallographic measurement for aminoketones and the computational estimated for this simplest system are quite close to the theoretical ideal of a tetrahedral angle ( internal angles of a tetrahedron, 109.5?), consistent with the importance of this geometry in developing transition states in nucleophilic attacks at trigonal centers.
6.
The ends are trihedral ( i . e ., composed of three planes ) sections of rhombic dodecahedra, with the dihedral angles of all adjacent surfaces measuring 120? the angle that minimizes surface area for a given volume . ( The angle formed by the edges at the pyramidal apex, known as the tetrahedral angle, is approximately 109?28'16 " ( arccos ( " 1 / 3 ) } } ) .)
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