What is the IUPAC name of the following compo | vedclass

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(C) $1$. Identify the spiro compound structure: It consists of a six-membered ring and a five-membered ring joined at a common spiro carbon atom.$2$.

Vedclass · Accepted Answer

$2$-methylspiro$[4.5]$dec-$2$-ene

Vedclass · Answer

(C) $1$. Identify the spiro compound structure: It consists of a six-membered ring and a five-membered ring joined at a common spiro carbon atom.$2$. Numbering rule for spiro compounds: Start numbering from the atom adjacent to the spiro carbon in the smaller ring,proceed through the spiro carbon to the larger ring,giving the lowest possible locants to substituents and multiple bonds.$3$. The smaller ring has $4$ carbons (excluding the spiro carbon) and the larger ring has $5$ carbons (excluding the spiro carbon). Thus,the bracket notation is $[4.5]$.$4$. Numbering the smaller ring: Start from the carbon adjacent to the spiro carbon such that the double bond gets the lowest number. If we start from the carbon with the methyl group,the double bond is at position $2$. If we start from the other side,the double bond is at position $1$. To give the methyl group the lowest locant,we number such that the double bond starts at $2$ and the methyl group is at $2$.$5$. The correct $IUPAC$ name is $2$-methylspiro$[4.5]$dec-$2$-ene.

What is the $IUPAC$ name of the following compound?

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