18631-84-0

Basic information

• Product Name: 1-Methyl-2-methylenecyclopropane
• Synonyms: 1-Methyl-2-methylenecyclopropane
• CAS NO: 18631-84-0
• Molecular Formula: C₅H₈
• Molecular Weight: 68.117
• Mol File: 18631-84-0.mol

Chemical Properties

• Boiling Point: 32.8°Cat760mmHg
• Flash Point: °C
• Appearance: /
• Density: 0.78g/cm³
• Vapor Pressure: 575mmHg at 25°C
• Refractive Index: 1.432
• CAS DataBase Reference: 1-Methyl-2-methylenecyclopropane(CAS DataBase Reference)
• NIST Chemistry Reference: 1-Methyl-2-methylenecyclopropane(18631-84-0)
• EPA Substance Registry System: 1-Methyl-2-methylenecyclopropane(18631-84-0)

Safety Data

• Hazardous Substances Data: 18631-84-0(Hazardous Substances Data)

Usage

InChI:InChI=1/C5H8/c1-4-3-5(4)2/h5H,1,3H2,2H3

Upstream product

• 591-96-8 penta-2,3-diene 
• 52194-08-8 trans-1,2-Dimethyl-3-bromcyclopropan 
• 78-79-5 isoprene 
• 67301-36-4 4-ethylidene-4,5-dihydro-3H-pyrazole 
• 67301-35-3 3-methyl-4-methylidene-1-pyrazoline 
• 32264-68-9 1,1-Dibromo-2,3-dimethylcyclopropane 
• 53177-35-8 1-Chloro-2,3-dimethyl-cyclopropane 

Downstream Products

• 62185-64-2 3,4-Dimethyl-3-cyclopenten-1-carbonsaeure-methylester 
• 62185-63-1 3,4-Dimethyl-2-cyclopenten-1-carbonsaeure-methylester 
• 62185-62-0 3-methyl-4-methylenecyclopentanecarboxylic acid methyl ester 
• 78-79-5 isoprene 
• 646-04-8 (E)-pent-2-ene 
• 109-67-1 1-penten 
• 930-18-7 cis-1,2-dimethylcyclopropane 
• 563-46-2 2-Methyl-1-butene 
• 1192-08-1 3-methylcyclobutan-1-one 
• 18631-83-9 ethylidene-cyclopropane 
• 591-93-5 1,4-Pentadiene 
• 87753-71-7 cis-3-Methyl-4-methylencyclopentancarbonsaeure-tert-butylester 
• 87753-71-7 trans-3-Methyl-4-methylencyclopentancarbonsaeure-tert-butylester 
• 100942-41-4 5-Benzhydryl-2,3-dimethyl-1-phenyl-1H-pyrrole 

Relevant articles and documents

Intramolecular Steric Factors in the Thermolysis of 4-Alkylidine-1-pyrazolines

Secondary deuterium kinetic isotope effects and product proportions are measured for several methyl-substituted 4-methylene-1-pyrazolines and deuterated isotopomers.The kinetic data support a single-bond-cleavage mechanism, and the products indicate that three modes of ring closure are required.Evidence is presented for a series of monomethyl compounds to suggest that the mechanism is more complex than a two-step scheme would predict and that the interconversion of a series of intermediates 46 is required.

EVIDENCE FOR DIAZENYL ALLYL DIRADICALS IN THE THERMOLYSIS OF 4-ALKYLIDENE-1-PYRAZOLINES

Secondary deuterium kinetic isotope effects indicate that the C-N bond anti to the Me group on 4-ethylidene-1-pyrazoline breaks preferentially to the syn bond.It is suggested that the product determining step involves an intramolecular radical displacement of nitrogen, as well as an electrocyclic rotation of the allylic methylene groups of the diazenyl allyl diradical, to generate the cyclopropane ring concerted with the loss of nitrogen.The position of deuterium in the methylmethylenecyclopropane can best be rationalized by this latter step.