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Research draft

alkene

vr.tr.alkene · PHY.MAT

Let an agent explain alkenes and their chemistry, name and identify alkene isomers, describe reactions and industrial uses, and give safety guidance.

Thing Registry Physical world and living systems

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain alkenes and their chemistry, name and identify alkene isomers, describe reactions and industrial uses, and give safety guidance.

An unsaturated hydrocarbon containing at least one carbon-carbon double bond, such as ethene, propene, the butenes and longer chain alkenes, with cis and trans isomers where substitution allows, characterised by addition reactions across the double bond; alkenes are produced by cracking petroleum and are the feedstock for polymers, plastics and many chemicals.

What it is for: Hydrocarbons with double bonds.

It can be explain alkene structure and isomerism; name and identify alkenes; describe reactions and uses; give safety guidance.

Distinguishing features

Double bond

Geometric isomerism

Addition chemistry

Polymer feedstock

What it looks like

Gases or volatile liquids for small alkenes; waxy solids for long chains.

How it is recognised

Carbon-carbon double bond

Addition reactions

Alkanes are saturated; alkynes have triple bonds

Related models

is a kind of - category

aliphatic hydrocarbon

is a kind of - category

olefin

is related to - another functional group class

nitrile

is related to - produced by cracking

refining

In practice

Families and kinds

simple alkenes such as ethene and propene

butenes and pentenes with cis and trans isomers

long-chain alkenes

dienes and polyenes

cycloalkenes

Standards and regulation

Chemical safety data sheet requirements

Flammable gas handling rules

IUPAC nomenclature

Failure modes and hazards

Flammability and explosion

Confusing cis and trans isomers

Pressurised gas hazards

Also called

dicyclobutylidenecis-2-butenetrans-2-buteneTetradec-4-ene2-pentene1-undecenedodecene1-hexene1-eicoseneheptadecene1-hexadecene(7E)-7-tetradecene3-methyl-1-heptene1-tridecene(4E)-4-tetradecene2-methyl-1-pentene(2E)-2-tetradecene1-pentadecene1-pentene7-tetradecenepremutilin(2E)-2-pentene(1,2-¹³C₂)Dodec-1-enetetradeceneethylene derivativepropylenebutenepentenehexenehepteneoctenenonenedecenedienophile4,6,8-trimethyl-1-nonenecis-alkeneoctadecenetripropylenealpha-olefin2-Tetradecene

+71

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Also registered as vr.tr.alkene

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Chemistry Structure and isomerism.

Definitions.

Structure

The double bond.

Structure

Structure.

  1. What defines an alkene, and how do its properties follow from the double bond? definition
  2. What are cis and trans isomers, and how are they named? definition

Name

Naming alkenes.

Name

Naming.

  1. What is the IUPAC name of this alkene, and what is its structure? action
  2. Is this molecule an alkene? definition
Reactions Alkene reactions.

Reactivity.

Addition

Addition reactions.

Addition

Addition.

  1. How do alkenes undergo addition of hydrogen, halogens, water and acids, and what rule governs regiochemistry? definition
  2. How are alkenes tested for in the laboratory? action

Polymer

Polymerisation.

Polymer

Polymerisation.

  1. How do alkenes polymerise into plastics such as polyethylene and polypropylene? definition
  2. Which entry fits a specific polymer? action
Industry Production and use.

Applications.

Production

Making alkenes.

Production

Production.

  1. How are alkenes produced by cracking and dehydrogenation, and how large is the industry? provenance
  2. Which alkenes are most important? provenance

Safety

Handling alkenes.

Safety

Safety.

  1. How should alkene gases and liquids be handled and stored safely? provenance
  2. Is there a leak or exposure now? boundary
Learn Teaching and nature.

Context.

Nature

Alkenes in nature.

Nature

Nature.

  1. Which alkenes occur naturally, such as ethene as a plant hormone and terpenes? provenance
  2. What roles do they play? provenance

Teach

Teaching.

Teach

Teaching.

  1. How can alkene chemistry be taught with models and experiments? action
  2. Which misconceptions arise? provenance

What the second pass must settle

  • Should individual alkenes be separate entries?
  • How should safety data be linked?
  • How should reaction databases be linked?
Draft as JSON