83320-81-4

Basic information

• Product Name: 3,17-dimethyl-9-diphenylmethylenenonadeca-3,5,7,10,12,14,16-heptaene-1,18-diyne
• Synonyms: 3,17-dimethyl-9-diphenylmethylenenonadeca-3,5,7,10,12,14,16-heptaene-1,18-diyne
• CAS NO: 83320-81-4
• Molecular Weight: 438.612
• Mol File: 83320-81-4.mol

Chemical Properties

• CAS DataBase Reference: 3,17-dimethyl-9-diphenylmethylenenonadeca-3,5,7,10,12,14,16-heptaene-1,18-diyne(CAS DataBase Reference)
• NIST Chemistry Reference: 3,17-dimethyl-9-diphenylmethylenenonadeca-3,5,7,10,12,14,16-heptaene-1,18-diyne(83320-81-4)
• EPA Substance Registry System: 3,17-dimethyl-9-diphenylmethylenenonadeca-3,5,7,10,12,14,16-heptaene-1,18-diyne(83320-81-4)

Safety Data

• Hazardous Substances Data: 83320-81-4(Hazardous Substances Data)

Upstream product

• 117-34-0 2,2-diphenylacetic acid 
• 1871-76-7 diphenylacetic acid chloride 
• 74231-42-8 3,17-dimethyl-3,5,7,10,12,14,16-nonadecaheptaene-1,18-diyn-9-one 

Downstream Products

• 83320-74-5 6,11-dimethyl-19-diphenylmethylene-7,8,9,10-tetradehydrocyclononadecene 

Relevant articles and documents

THE SYNTHESIS OF DIPHENYLTRIDECA-, -PENTADECA-, -HEPTADECA-, AND -NONADECAFULVENE DERIVATIVES

Title fulvenes were synthesized through the reaction of the large-membered annulenones with diphenylketene, and examination of (1)H-NMR spectra suggests that the fulvenes are atropic.

Syntheses and Properties of Dimethyldiphenyltetradehydro-trideca-, -pentadeca-, -heptadeca-, -nonadeca-fulvene, and Benzannelated Pentadecafulvene Derivatives

Syntheses of 4,9-dimethyl-13-diphenylmethylene-5,6,7,8-tetradehydrocyclotridecene (7), 4,9-dimethyl-15-diphenylmethylene-5,6,7,8-tetradehydrocyclopentadecene (8), 6,11-dimethyl-17-diphenylmethylene-7,8,9,10-tetradehydrocyclopentadecene (9), and 6,11-dimethyl-19-diphenylmethylene-7,8,9,10-tetradehydrocyclononadecene (10) are described.Although examination of the 1H n.m.r. spectra suggested that all of the fulvenes (7)-(10) are atropic, the benzannelated derivatives of pentadecafulvene (8), i.e. 13-methyl-7-diphenylmethylene-14,15,16,17-tetradehydrobenzocyclopentadecene (25), 13-methyl-9-diphenylmethylene-14,15,16,17-tetradehydrobenzocyclopentadecene (26) and 7-diphenylmethylene-16,17,18,19-tetradehydrodibenzocyclopentadecene (27) were prepared in order to examine the tropicity of (8) more closely.Comparison of the 1H n.m.r. spectra of these benzannelated fulvenes (25)-(27) with that of 88) reveals that the nonbenzannelated fulvene 88) is atropic.The influence of benzannelation upon the structure of the molecular skeleton of the tetradehydropentadecafulvene system is also discussed.