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

Loratadine, marketed as an antiallergy medication under the brand name Claritin, has four rings, eight double bonds, and the formula $\mathrm{C}_{22} \mathrm{H}_3 \mathrm{ClN}_2 \mathrm{O}_2$. How many hydrogens does loratadine have? (Calculate your answer; don't count hydrogens in the structure.) figure cant copy

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Key Concepts

Saturated Hydrocarbons and Hydrogen Count

A fully saturated hydrocarbon follows the formula CnH2n+2, meaning it has the maximum number of hydrogens possible without any rings or double bonds. When other atoms like halogens and nitrogens are present, adjustments are made by treating halogens similarly to hydrogens and adding nitrogens appropriately. Comparing the maximum hydrogen count with the actual hydrogen count, after accounting for the degree of unsaturation, helps in determining the structure of the molecule.

Molecular Formula Analysis

Analyzing a molecular formula involves calculating the expected number of hydrogens for a saturated molecule and then subtracting those removed by rings and multiple bonds (each unit of unsaturation removes two hydrogens). This method is key in deducing structural features such as rings and double bonds without explicit structural depiction.

Degree of Unsaturation

This concept quantifies the total number of rings and pi bonds (double bonds or triple bonds) present in a molecule by comparing its molecular formula to that of a fully saturated compound. The formula (2C + 2 + N - H - X)/2, where C, H, N, and X represent the number of carbons, hydrogens, nitrogens, and halogens respectively, allows chemists to determine how many hydrogens are 'missing' due to unsaturation.

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