160731-87-3

Basic information

• Product Name: 1,3-cyclopentanedione, 2-(diphenylmethyl)-2-methyl-
• Synonyms: 2-(Diphenylmethyl)-2-methylcyclopentane-1,3-dione
• CAS NO: 160731-87-3
• Molecular Formula: C₁₉H₁₈O₂
• Molecular Weight: 278.345
• Mol File: 160731-87-3.mol
• Article Data: 3

Chemical Properties

• Boiling Point: 433.373°C at 760 mmHg
• Flash Point: 161.819°C
• Density: 1.149g/cm³
• Vapor Pressure: 0mmHg at 25°C
• Refractive Index: 1.588
• CAS DataBase Reference: 1,3-cyclopentanedione, 2-(diphenylmethyl)-2-methyl-(CAS DataBase Reference)
• NIST Chemistry Reference: 1,3-cyclopentanedione, 2-(diphenylmethyl)-2-methyl-(160731-87-3)
• EPA Substance Registry System: 1,3-cyclopentanedione, 2-(diphenylmethyl)-2-methyl-(160731-87-3)

Safety Data

• Hazardous Substances Data: 160731-87-3(Hazardous Substances Data)

Upstream product

• 765-69-5 2-Methylcyclopentane-1,3-dione 
• 776-74-9 Bromodiphenylmethane 
• 91-01-0 1,1-Diphenylmethanol 

Relevant articles and documents

Chiral Phosphoric Acid Catalyzed Desymmetrization of Cyclopentendiones via Friedel–Crafts Conjugate Addition of Indolizines

An organocatalytic highly diastero- and enantioselective Friedel–Crafts conjugate addition of indolizines to prochiral cyclopentenediones has been successfully developed. This desymmetric transformation provides a direct access to the desired indolizine-substituted cyclopentanediones in yields of 62–91% and excellent stereoselectivities. The utility of the approach was demonstrated by diverse late-stage functionalizations through reduction or oxidation. Importantly, the direct sp2 C–H functionalization with nitromethane in one-pot process resulted in the indolizine-linked axially chiral styrene bearing a remote chiral center.

Substituent Effects on the CC Bond Strength, 16. - Thermal Stability and Enthalpies of Formation of β-Dicarbonyl Compounds. - Stabilisation Enthalpies of α,α'-Diketoalkyl Radicals

The geminal interactions of the two carbonyl groups in seven β-diketones of the type 8-9 and 11-13 were estimated from their enthalpies of formation, which were deduced from their heats of combustion and enthalpies of vaporization.The radical stabilisation enthalpies RSE of the α,α'-diketoalkyl radicals 9-13 were obtained from the enthalpies of activation ΔH(excit.) of thermal CC bond cleavage of eight model compounds of the type 9-13 by their comparison with ΔH(excit.) of comparable hydrocarbons of similar strain.For non-cyclic α,α'-diacylalkyl radicals and six-membered cyclic ones RSE = 54.8 +/- 1.3 kJ mol-1 was determined, which indicates an additive stabilisation by two carbonyl groups. - Key Words: Enthalpies of formation/ Geminal substituents, energetic interaction of/ Bond cleavage, C-C, kinetics of/ Radicals, stability of/ Increments, thermochemical/ Bond strength, substituent effects on