Question

What is IUPAC name of the following compound? ill a. (S)-2-methyl-1-butyn-3-ol (R)-2-methyl-3-butyn-1-ol None of these choices d. (S)-2-methyl-3-butyn-1-ol e. (R)-2-methyl-1-butyn-3-ol

Answer 1

SY For JUPAC naming of this chiral compound, the ratereochemistry of the chiral centre is to be mentioned. The priority order of the groups attached with the chiral carbon (according to CSP rule) is - - CHOHY - C=CHY - CH₂ 7 4 .. 40 2nd priority gr. is in the 4 back side 2.e. even 4 priority gr. in back side We leave the below gr. and the other gr. i.e. 1 3 - 4 is clockwise. So the Stereochemistory of this chiral carbon is R. Now, to determine the JUPAC name, we have to number the carbon atoms to find the long chain and also we have to maintain the SUPAC rule to get the lowest numbering atom. 10-22 - H Name 2-methyl-3-butyn-1-ol So, the name of the given compound in a (R) - 2-methyl-3-butyn-1-ol. And option 6