The "Cis effect" can refer to a variety of contexts depending on the field of study. Here are a couple of interpretations based on common usage in different disciplines: 1. **In Chemistry**: The term "cis" is often used in the context of stereochemistry to describe the spatial arrangement of atoms or groups in a molecule.
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The carbonyl cis effect is preferential labilization of a ligand cis to another ligand in many six-coordinate metal carbonyls. Site preference in five-coordinate intermediates and transition states matters. Isotopic exchange can distinguish departure sites more directly than substitution-product geometry alone.