71709-20-1

Basic information

• Product Name: 4-Methoxy-2,4,6-triphenyl-4H-pyran
• CAS NO: 71709-20-1
• Molecular Weight: 340.422
• Mol File: 71709-20-1.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: 4-Methoxy-2,4,6-triphenyl-4H-pyran(CAS DataBase Reference)
• NIST Chemistry Reference: 4-Methoxy-2,4,6-triphenyl-4H-pyran(71709-20-1)
• EPA Substance Registry System: 4-Methoxy-2,4,6-triphenyl-4H-pyran(71709-20-1)

Safety Data

• Hazardous Substances Data: 71709-20-1(Hazardous Substances Data)

Upstream product

• 15959-35-0 2,4,6-triphenylpyrylium 
• 3315-60-4 methanolate 
• 6552-73-4 sodium methoxide-d3 
• 1484-88-4 2,4,6-triphenylpyrilium perchlorate 
• 124-41-4 sodium methylate 

Downstream Products

• 1484-88-4 2,4,6-triphenylpyrilium perchlorate 

Relevant articles and documents

Positional Selectivity and Heteroatom Effect in the Reaction of 2,4,6-Triphenylpyrylium and 2,4,6-Triphenylthiopyrylium Ions with Methoxide Ion

The rate constants for 2H and 4H adduct formation were determined for the reaction of the 2,6-diphenyl-4-X-pyrylium ion (1, X=Ph) and of 2,4,6-triphenylthiopyrylium ion 2 with methoxide ion in methanol solution.The equilibrium constans were evaluated for the formation of the 4H adducts.The ipso attack at the 4-position is found to be in the order H>MeO>Ph for the 4-X substituents and mainly caused by ground-state stabilization for X=Ph.The substrate and positional reactivities of 1 and 2 differ appreciably from each other and suggest that the reaction of 1 and,possibly, 2 are charge rather then orbital controlled.

1H Nuclear Magnetic Resonance Study of Methoxide Addition to Pyrylium and Thiopyrylium Cations; Heteroatom and Substituent Effects

Methoxide addition to pyrylium and thiopyrylium salts with various α-substituents (Ph or tBu) and γ-substituents (H, Me, tBu, Et3C, Ph or MeO) in methanol at -40 and 25 deg C has been studied by 1H n.m.r.The composition of the product mixtures, kinetically controlled at -40 deg C and thermodynamically controlled at 25 deg C, gives information on the factors affecting positional selectivity and the relative thermodynamic stability of the addition products (the 2H- and 4H-adduct).The methyl-substituted substrates also undergo deprotonation, to yield the corresponding anhydro-bases.Analysis of heteroatom and substituent effects on the rean course emphasizes the role of polar and steric interactions, and sheds light on the structures of the transition states.