PMID- 17559164 OWN - NLM STAT- MEDLINE DCOM- 20071024 LR - 20131121 IS - 0749-1581 (Print) IS - 0749-1581 (Linking) VI - 45 IP - 8 DP - 2007 Aug TI - Structure elucidation of thermal degradation products of amlodipine. PG - 688-91 AB - Thermal degradation of amlodipine base causes intramolecular reactions affording three cyclic products, referred to as AMLDEG-I, AMLDEG-II, and AMLDEG-III, respectively. AMLDEG-I is a cyclized product formed by intramolecular elimination of ammonia from amlodipine. AMLDEG-II is a positional isomer of AMLDEG-I. AMLDEG-III is also intramolecular cyclisation product. The three degradation products were isolated by column chromatography and characterized by FT-IR and 1H and 13C NMR spectroscopy data. The AMLDEG-III was crystallized and its structure was solved by single crystal X-ray diffraction (SXRD). CI - Copyright 2007 John Wiley & Sons, Ltd. FAU - Lakshmi Devi, A Siva AU - Lakshmi Devi AS AD - Analytical Research and Development, Matrix Laboratories Ltd., Jeedimetla, Hyderabad, India-500055, India. sivalakshmi@matrixlabsindia.com FAU - Srinivasa Rao, Y AU - Srinivasa Rao Y FAU - Satish, M AU - Satish M FAU - Jyothi, G AU - Jyothi G FAU - Babu Rao, K AU - Babu Rao K FAU - Omdutt, T AU - Omdutt T LA - eng PT - Journal Article PL - England TA - Magn Reson Chem JT - Magnetic resonance in chemistry : MRC JID - 9882600 RN - 1J444QC288 (Amlodipine) SB - IM MH - Amlodipine/*chemistry MH - Cyclization MH - *Hot Temperature MH - *Magnetic Resonance Spectroscopy MH - Molecular Structure MH - X-Ray Diffraction EDAT- 2007/06/15 09:00 MHDA- 2007/10/25 09:00 CRDT- 2007/06/15 09:00 PHST- 2007/06/15 09:00 [pubmed] PHST- 2007/10/25 09:00 [medline] PHST- 2007/06/15 09:00 [entrez] AID - 10.1002/mrc.2022 [doi] PST - ppublish SO - Magn Reson Chem. 2007 Aug;45(8):688-91. doi: 10.1002/mrc.2022.