Loratadine, marketed as an antiallergy medication under the...

Loratadine, marketed as an antiallergy medication under the name Claritin, has four rings, eight double bonds, and the formula $\mathrm{C}_{22} \mathrm{H}_{?} \mathrm{ClN}_{2} \mathrm{O}_{2} .$ How many hydrogens does loratadine have? (Calculate your answer; don't count hydrogens in the structure.)

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Key Concepts

Molecular Formula Analysis

This concept involves examining an organic compound's molecular formula to determine the number of atoms present. It is essential for understanding the composition of a molecule and for performing calculations related to its structure, such as determining the number of hydrogen atoms when other elements and features (like rings or double bonds) are known.

Degree of Unsaturation (Index of Hydrogen Deficiency)

The degree of unsaturation, or index of hydrogen deficiency, is a calculation that predicts the number of rings and multiple bonds in a molecule. It provides insight into structural features such as double bonds, triple bonds, and rings, which remove hydrogen atoms from what would be a fully saturated compound.

Structural Features Impact on Hydrogen Count

Structural features like rings and double bonds reduce the number of hydrogen atoms compared to a saturated molecule. Understanding how these elements affect hydrogen count is crucial when reconstructing the complete molecular formula from partial information, such as knowing the number of rings and double bonds present.

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