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What is the structure for (2R,3R)-2,3-epoxyhexane? and can you explain the R?

What is the structure for (2R,3R)-2,3-epoxyhexane? and can you explain the R?

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Answer #1

Since it is 2R and 3R, the priority of a curved arrow is drawn from the highest priority (1) substituent to the lowest priority (4) substituent. If the arrow points in a counterclockwise direction (left when leaving the 12 o' clock position), the configuration at stereocenter is considered S ("Sinister" → Latin= "left"). If, however, the arrow points clockwise, which is in this case as they are given as 2R and 3R (Right when leaving the 12 o' clock position) then the stereocenter is labeled R ("Rectus" → Latin= "right").

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