Understanding Bulky Groups: Definition and Explanation

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Discussion Overview

The discussion revolves around the definition and explanation of the term "bulky group" in the context of chemistry, particularly focusing on steric hindrance and its implications for chemical reactions.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant seeks a definition for "bulky group," indicating a lack of clarity on the term.
  • Another participant defines a bulky group as one that is large and bulky, emphasizing the role of steric hindrance in determining reaction pathways.
  • A further contribution suggests that understanding bulkiness may benefit from visual models and reiterates that the term refers to the size of the group.
  • Examples of non-bulky groups, such as cyanide (-CN) and azide (-N3), are provided, contrasting them with the bulky t-butyl group (-C(CH3)3), which is noted for its significant steric hindrance due to multiple methyl groups.
  • A participant expresses gratitude for the responses and indicates an intention to research steric hindrance further.

Areas of Agreement / Disagreement

Participants generally agree on the concept of bulkiness relating to size and steric hindrance, but there is no consensus on a formal definition of "bulky group." The discussion remains exploratory with varying levels of detail and examples provided.

Contextual Notes

Limitations include the absence of a formal definition for "bulky group" and the reliance on examples to illustrate the concept, which may not cover all interpretations or contexts.

ldv1452
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What is meant by the term "bulky group?" I couldn't find a definition for this.
 
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A group that litterally is big and bulky, where steric hindrance becomes a deciding factor for which reactions take place.

Try searching for steric hindrance on Wikipedia to read more.
 
It might be easier to understand the bulkiness of a group with some kind of model set. But as espen said, it literally refers to the size of the group.

Examples of non-bulky groups would be the cyanide (-CN) and azide (-N3) ions, which are small, linear, and shaped like "bullets." The classic "bulky" group is t-butyl, -C(CH3)3. All those methyl groups create quite a bit of steric hindrance.
 
Thank you for the responses. I'll read up on steric hindrance as well.
 

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