Andrii Kozytskyi

What’s inside your Coke Zero? 🧪🥤 Ever wondered what a sugar-free drink looks like at the molecular level? This is a 600 MHz ¹H NMR spectrum of Coca-Cola Zero (Ukrainian edition). Even without sugar, the chemistry is dense! Here’s the breakdown: 👇🧵 #nmr #nmrchat #dietcoke

• 🍋 Flavor & Stability: The doublets near 2.8 ppm belong to Sodium Citrate, keeping the acidity in check. • 🌊 The "Missing" Peak: The gap at 4.8 ppm is where the water signal was suppressed. 👇🧵

What’s inside your Coke Zero? 🧪🥤 Ever wondered what a sugar-free drink looks like at the molecular level? This is a 600 MHz ¹H NMR spectrum of Coca-Cola Zero (Ukrainian edition). Even without sugar, the chemistry is dense! Here’s the breakdown: 👇🧵 #nmr #nmrchat #dietcoke

NMRMultiplet In saturated 6-membered rings, the position of a proton dictates the entire splitting pattern. Since this proton is axial, the coupling tree reveals a classic set of interactions: 🧵👇 #nmr #nmrchat #chemistry #organicchemistry

• 12.1 Hz: Geminal coupling (2J). • 10.6 Hz & 9.7 Hz: Two strong axial-axial 3J couplings — the hallmark of an anti-periplanar relationship. • 4.04 Hz: One smaller axial-equatorial 3J coupling. This dddd pattern at 1.47 ppm provides a perfect "fingerprint" for stereochemical assignment. 👇🧵

The results are in! 🧪 The correct structure for this #NMRweekend challenge is A. The most reliable way to distinguish between N-alkylated 2-pyridones and O-alkylated 2-alkoxypyridines lies in the coupling constants of the alpha-protons (H6).🧵👇

As a secondary "double-check," we can look at the methylene (CH2) bridge: • N-CH2 (Structure A) appears upfield at 4.87 ppm. • O-CH2 (Example on Slide 2) shifts downfield to 5.35 ppm due to the stronger deshielding effect of the oxygen atom.🧵👇

The results are in! 🧪 The correct structure for this #NMRweekend challenge is A. The most reliable way to distinguish between N-alkylated 2-pyridones and O-alkylated 2-alkoxypyridines lies in the coupling constants of the alpha-protons (H6).🧵👇