83747-02-8

Basic information

• Product Name: 2-Pentynoic acid, 4,4-dimethyl-, 1,1-dimethylethyl ester
• CAS NO: 83747-02-8
• Molecular Formula: C11H18O2
• Molecular Weight: 182.263
• Mol File: 83747-02-8.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: 2-Pentynoic acid, 4,4-dimethyl-, 1,1-dimethylethyl ester(CAS DataBase Reference)
• NIST Chemistry Reference: 2-Pentynoic acid, 4,4-dimethyl-, 1,1-dimethylethyl ester(83747-02-8)
• EPA Substance Registry System: 2-Pentynoic acid, 4,4-dimethyl-, 1,1-dimethylethyl ester(83747-02-8)

Safety Data

• Hazardous Substances Data: 83747-02-8(Hazardous Substances Data)

Upstream product

• 119-61-9 benzophenone 
• 83747-01-7 Diazo(1,2,3-tri-tert-butyl-2-cyclopropen-1-yl)essigsaeure-tert-butylester 

Relevant articles and documents

Syntheses with Cyclobutadienes, 19. - Ring Opening of Bi- and Tricyclic Adducts of Carbonyl Compounds onto a Kinetically Stabilized Cyclobutadiene

Benzophenone (6) adds photochemically onto the cyclobutadiene 5b to give the oxabicyclohexene 7 which is in equilibrium with the oxatricyclohexane 8 in acidic medium.The reaction of fluorenone (11) with 5b is comparable (formation of 12 and 13) but the bicyclic compound undergoes spontaneous ring opening reaction to the 1,3-diene 14.The latter one isomerizes photochemically by electrocyclic ring closure to the cyclobutene 15; this process is reversible thermally.The cyclopropenone 16 only reacts slowly at room temperature with 5b; instead of the primary adduct 17 the isomeric trifulvene 18 is isolated.Under the influence of trifluoroacetic acid the oxabicyclohexenes (7->19,21a,c,d->22a,c,d) as well as the oxatricyclohexanes (8->19, 13->14) undergoing ring opening reactions to the corresponding 1,3-dienes.Crystal structure analyses have been performed for 18 and 22a.