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TLC (Thin Layer Chromatography) offers a simple approach to identifying a solvent(s) for separating out a mixture, monitoring a reaction to completion, etc. Furthermore, the TLC plates can be stained to identify the presence or absence of various functional groups such as amines, ketones, etc. This qualitative experiment does offer various drawbacks. The process of...

Characteristic isotopic patterns in MS can assist the elucidator in revealing the presence or absence of atoms. For the Br, Cl, S and Si atoms, a good approach is to examine the peak intensity of the A+2 signal. The respective contributions by the isotopes 81Br, 37Cl, 34S and 30Si are approximately 49.3, 24.3, 4.2 and...

Given any experimental data, producing a list of scenarios that are consistent with the data can help guide an elucidator through the problem while ensuring nothing gets overlooked. For an unknown compound, the carbon count is identified at 18 in total. The 13C NMR spectrum below indicates 19 carbon atoms. There are two 13C signals,...

With any experimental data, producing a list of scenarios that are consistent with the data can help guide an elucidator through the problem while ensuring nothing gets overlooked. For an unknown compound, the 1H -13C HMQC spectrum shows a CH group with a correlation at 7.0 and 113.0 ppm. Is the carbon hybridization an sp2 or...

Predicting pKa isn’t just computational, it’s about understanding chemical behavior. Learn about the science behind pKa, how different pKa predictors work, and how ACD/Labs’ tools help chemists and regulators anticipate molecular behavior before synthesis or testing begins.

Scientists at Merck published an article about using ChromGenius to predict retention times of new compounds. Abstract We introduce a new workflow that relies heavily on chemical quantitative structure-retention relationship (QSRR) models to accelerate method development for micro/mini-scale high-throughput purification (HTP). This provides faster access to new active pharmaceutical ingredients (APIs) through high-throughput experimentation (HTE)....

A New Resource for Structure Elucidation Education Toronto, Canada (June 3, 2015)—In conjunction with the publication of “Computer-Based Structure Elucidation from Spectral Data”, a new book written by Mikhail Elyashberg and Antony Williams and published by Springer, ACD/Labs has released a new Structure Elucidation Tutorial software package, free for educational use. Intended as a companion...

The European Bioinformatics Institute (EMBL-EBI) has released version 20 of ChEMBL, the database of compound bioactivity data and drug targets. ChEMBL now incorporates the Hierarchical Editing Language for Macromolecules (HELM), the macromolecular representation standard recently released by the Pistoia Alliance.   Wilmington, DE, USA (February 3, 2015)—The European Bioinformatics Institute (EMBL-EBI) has released version 20...

Faster, simplified processing of NMR data at every chemists’ desktop, with clear and easy reporting Toronto, ON, Canada (August 23, 2012)—One of China’s leading pharmaceutical contract research organizations (CROs) is providing each of their thousands of chemists in China with ACD/NMR Processor software. The CRO services a huge number of drug discovery and development projects...

CEAP Initiative Makes Chemical Drawing Package Available to Schools Toronto, Canada (May 19, 2009)—As part of their 15th anniversary celebrations, Advanced Chemistry Development, Inc., (ACD/Labs) has launched a new program in which they will provide site-wide licenses of their chemical structure drawing package, ACD/ChemSketch Freeware, to academic institutions. While many institutions have benefited from academic...