High Quality Content by WIKIPEDIA articles! Chiral molecules have two forms (at each point of asymmetry) which differ in their optical characteristics: the levorotatory form (the (?)-form) will rotate the plane of polarization of a beam of light to the left, while the dextrorotatory form (the (+)-form) will rotate the plane of polarization of a beam of light to the right. The two forms, which are non-superimposable when rotated in 3 dimensional space, are said to be enantiomers. A common misconception is that a point of asymmetry exists only if there are four different groups attached to the central atom (the chiral centre). Although this particular case always gives rise to chirality, other configurations may also make something chiral. When considering chemical stereochemistry it's important to recall that molecules exist in 3 dimensional space, and as such can have different arrangement of the atoms in that space. Notable examples include substituted allenes where the pendants of one end are oriented at right angle with those of the other end. Also, due to steric barriers, the two nathphyl groups of BINAP are held in place and do not slide past each other.

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