cisgeometric

cisgeometric refers to a specific type of geometric isomerism. It is one of two possible arrangements for substituents around a double bond or a ring. In cisgeometric isomerism, the two substituents are located on the same side of the double bond or the ring. This is in contrast to transgeometric isomerism, where the substituents are on opposite sides. The cis and trans designations are particularly important in organic chemistry, where they can significantly affect the physical and chemical properties of a molecule, such as its melting point, boiling point, and reactivity. For example, cis-but-2-ene and trans-but-2-ene are different compounds with distinct properties, even though they share the same molecular formula. The concept of geometric isomerism, including cisgeometric arrangements, is a fundamental aspect of understanding the three-dimensional structure of molecules and how this structure influences their behavior. The term "cis" itself is derived from Latin, meaning "on the same side." This simple mnemonic helps to remember the defining characteristic of this type of isomerism.