It does not meet the first criterion for being meso. It should be having a chiral carbon and should not contain any symmetry. Main Difference – Racemic Mixture vs Meso Compound. “ethylene hydrochloride” for chloroethane (ethyl … Also, it has an internal symmetry plane that divides the compound in half. Education; Science; Chemistry; How to Identify Molecules as Meso Compounds; How to Identify Molecules as Meso Compounds. Here's a snippet with surroundings from the book (Experimental Organic Chemistry – A Miniscale and Microscale Approach), for the context: Should we accept the name “stilbene dibromide” (which is almost as bad as would be e.g. 10 Tips for Surviving Organic Chemistry. Load more. The stereochemistry of stereocenters should "cancel out". He's the founder and director of Chemistry Help Center, a huge science nerd, an avid Magic: the Gathering player, a life-long learner, and a world traveller (visited over 30 countries on 5 continents). The meso compound must not be confused with a 50:50 racemic mixture of the two optically-active compounds, although neither will rotate light in a polarimeter. In general, a meso compound should contain two or more identical substituted stereocenters. It comes from the Greek for "middle" or "mid", and refers to the fact that the molecule can rotate about its middle. By Arthur Winter . The terms ortho, meta, and para are prefixes used in organic chemistry to indicate the position of non-hydrogen substituents on a hydrocarbon ring (benzene derivative). What does non-superimposable mean? ... Victor is a professional chemical educator and researcher, organic chemistry tutor, and an academic coach from Colorado Rocky Mountains. The prefixes derive from Greek words meaning correct/straight, following/after, and similar, respectively. The two terms racemic mixture and meso compound are used in organic chemistry to describe different organic compounds.A racemic mixture is also known as a racemate.It is a mixture of equal amounts of left and right-handed enantiomers.Enantiomers are optical isomers that are non-superimposable mirror images of each other. The presence of chiral centers does not necessarily mean a compound is chiral. Organic Chemistry I For Dummies Cheat Sheet. These two halves reflect each other by the internal mirror. If you want to check directly from a compound without carrying out a reaction then the compound should be optically active. It has many internal planes of symmetry but does not have any chiral centers. For an example, benzene is achiral but not meso. Meso is a prefix which, by strict definitions, indicates the presence of a 17th chiral center. It is a requirement for two of the stereocenters in a meso compound to have at least two substituents in common (although having this characteristic does not necessarily mean that the compound is meso). How to Predict the Equilibrium Direction of an Acid-Base Reaction. Periodic Table of Elements . All chiral compounds cannot be considered meso as you suggested.