21071-42-1

Basic information

• Product Name: Benzene, 1,1'-(1,2-ethenediyl)bis[2,5-dimethoxy-4-methyl-, (E)-
• CAS NO: 21071-42-1
• Molecular Formula: C20H24O4
• Molecular Weight: 328.408
• Mol File: 21071-42-1.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: Benzene, 1,1'-(1,2-ethenediyl)bis[2,5-dimethoxy-4-methyl-, (E)-(CAS DataBase Reference)
• NIST Chemistry Reference: Benzene, 1,1'-(1,2-ethenediyl)bis[2,5-dimethoxy-4-methyl-, (E)-(21071-42-1)
• EPA Substance Registry System: Benzene, 1,1'-(1,2-ethenediyl)bis[2,5-dimethoxy-4-methyl-, (E)-(21071-42-1)

Safety Data

• Hazardous Substances Data: 21071-42-1(Hazardous Substances Data)

Upstream product

• 87050-71-3 4,4'-Dimethyl-2,2',5,5'-tetramethoxy-stilben 
• 4925-88-6 2,5-dimethoxy-4-methylbenzaldehyde 
• 25224-33-3 (2,5-dimethoxy-4-methylbenzyl)triphenylphosphonium chloride 

Downstream Products

• 87050-72-4 (E)-1,2-bis[4-(bromomethyl)-2,5-dimethoxyphenyl]ethene 
• 87050-73-5 (E)-1,2-bis<4-<(acetyloxy)methyl>-2,5-dimethoxyphenyl>ethene 
• 17228-87-4 1,2-bis(2,5-dimethoxy-p-tolyl)ethane 
• 87050-81-5 trans-1,2-bis(2,5-dimethoxy-p-tolyl)cyclopropane 

Relevant articles and documents

Acid catalysis vs. electron-transfer catalysis via organic cations or cation-radicals as the reactive intermediate. Are these distinctive mechanisms?

Proton transfer to aromatic and olefinic donors (D) leads to the facile interchange of transient carbocations (DH+) and cation-radical (D+.). The same types of cation and cation-radical are reactive intermediates in the acid catalysis and the electron-transfer catalysis of such organic transformations as benzylic coupling, epoxide/pinacol rearrangements and cis-trans isomerization of stilbenes when they are both carried out under otherwise identical reaction conditions. However, the rapid exchange of diamagnetic cations and paramagnetic cation-radicals blurs the traditional view of separate electrophilic and homolytic processes, and rigorous experimental evidence is required to establish whether acid catalysis and electron-transfer catalysis actually represent distinct mechanistic categories. Acta Chemica Scandinavica 1998.