What is erythro and threo configuration?
Hint: Erythro and threo are two configurations in which molecules are written when the molecules have a chiral carbon atom. Erythro is the configuration when the same groups are on the same side of the carbon atom and Threo is the configuration when the same groups are on the opposite side of the carbon atom.
What is difference between threo and erythro form?
When two similar groups at non-identical chiral carbons are on the same side of the vertical line of the Fischer projection, the isomer is called erythro isomer, if the groups are on opposite sides, the isomers are called threo isomers.
What is threo and erythro diastereomers?
They are either geometrical isomers or compounds containing two or more chiral centres. A Diastereomer is called erythro if its Fischer projection shows similar groups on the same side of the molecule. It is called threo if similar groups are on the opposite sides of the Fischers projection.
Is erythro and threo more stable?
The meso-form is usually thought to be more thermodynamically stable than (&)-pairs, and erythro-isomers are likely to be more stable than threo-isomers for substituted ethane derivatives except in those cases where strong intramolecular bonding is possib1e.
What are threo and erythro isomers in stereochemistry?
Erythro / threo In the case of saccharides, when drawn in the Fischer projection the erythro isomer has two identical substituents on the same side and the threo isomer has them on opposite sides. When drawn as a zig-zag chain, the erythro isomer has two identical substituents on different sides of the plane (anti).
What is Threo pair?
Erythro and threo are common terms in stereochemistry used for naming molecules with two stereogenic centers. The configuration of any molecule with two stereogenic centers can be classified as erythro or threo.
What is the relationship between erythrose and threose isomers?
The two erythrose isomers are mirror images (enantiomers), as are the two threose isomers. Each erythrose is a diastereomer of the threoses, and vice versa.
Which conformation is erythro?
For an erythro isomer, in the staggered conformation, the terminal groups and the similar groups on adjacent carbon atoms must exhibit similar relative stereochemistry.
How can you identify erythrose and threose?
Erythro / threo When drawn as a zig-zag chain, the erythro isomer has two identical substituents on different sides of the plane (anti). The names are derived from the diastereomeric four-carbon aldoses erythrose (a syrup) and threose (melting point 126 °C).
What does Threo mean?
Definition of threo- You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
What is erythro?
What does erythro- mean? Erythro- is a combining form used like a prefix meaning “red.” It is often used in chemistry and medicine, and occasionally in geology. Erythro- comes from the Greek erythrós, meaning “red” or “reddish.”