G

Gem-Dimethyl Group

C(CH₃)₂
Quick Reference
Formula / NotationC(CH₃)₂
Also Known AsGeminal dimethyl, vicinal dimethyl at same carbon, 1,1-dimethyl group

What is Gem-Dimethyl Group?

A gem-dimethyl group (geminal dimethyl group) consists of two methyl groups attached to the same carbon atom. The prefix "gem" comes from the Latin "geminus" meaning twin. This structural feature appears in many natural products and pharmaceuticals and affects molecular properties including conformational rigidity, lipophilicity, and biological activity.

Formula & Notation

C(CH₃)₂

Other Names / Synonyms: Geminal dimethyl, vicinal dimethyl at same carbon, 1,1-dimethyl group

Properties & Characteristics

Structure: –C(CH₃)₂– (quaternary-like carbon with two methyl groups). Provides steric bulk and conformational restriction. Increases lipophilicity. Common in terpenoids, steroids, and amino acids (valine, leucine). Quaternary carbon when also bonded to two other non-H groups.

Uses & Applications

Medicinal chemistry (gem-dimethyl substitution affects drug metabolism and bioavailability). Natural product synthesis. Conformational control in organic synthesis. Building blocks for pharmaceuticals and agrochemicals. Terpene and sesquiterpene frameworks.

Safety Information

The gem-dimethyl group itself is not hazardous. Compounds containing it have individual safety profiles.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Gem-Dimethyl Group
Formula C(CH₃)₂
Synonyms Geminal dimethyl, vicinal dimethyl at same carbon, 1,1-dimethyl group

Frequently Asked Questions

A gem-dimethyl group (geminal dimethyl group) consists of two methyl groups attached to the same carbon atom. The prefix "gem" comes from the Latin "geminus" meaning twin. This structural feature appears in many natural products and pharmaceuticals and affects molecular properties including conformational rigidity, lipophilicity, and biological activity.

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