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Partitioning (logP or logD)—are you using/measuring the right descriptor?

In my past life, before ACD/Labs, I was an organic/medicinal chemist. I share this because it’s relevant to the topic. My first responsibility at ACD/Labs was to create materials to support our PhysChem product line. Many of the descriptors that made up the products I was charged with talking about—such as pKa, solubility, etc.—were first introduced to me by Mr. Jackson, my chemistry teacher in secondary school (high school). The others I learned about during my BSc and PhD—logP (from Lipinski’s rule-of-5), for example. I will confess, however, that when I was asked in my interview how I applied/considered logD values in my research I was completely stumped. What’s logD? I’d never heard of it! Read more →