74823-34-0

Upstream product

• 109-88-6 magnesium methanolate 
• 74823-33-9 3'-acetyl-3,5,5'-trismethoxycarbonylglaucyrone 
• 6853-77-6 3-acetyl-5-methoxycarbonyl-6-methyl-2-pyrone 

Downstream Products

• 74823-36-2 6-[(E)-2-(2-Hydroxy-3,5-bis-methoxycarbonyl-6-methyl-phenyl)-vinyl]-2-oxo-2H-pyran-3,5-dicarboxylic acid dimethyl ester 

Relevant academic research and scientific papers

Polyketoenols and Chelates. Glaucyrones and their Reactions with Magnesium Methoxide

Using the pyrone melt procedure of the preceding paper, 3,3',5,5'-tetrakismethoxycarbonylglaucyrone (2) and the tautomerically unsymmetrical 3'-acetyl-3,5,5'-trimethoxyglaucyrone (5) have been prepared.Conditions can be adjusted to prevent complete ester exchange in the reactin of 3,3'-diacetyl-5,5'-bisethoxycarbonylglaucyrone (1) with excess of magnesium methoxide, in accord with the mechanism proposed.On reaction with the latter reagent, the two new glaucyrones give aromatic penta-esters (11) and (14), and their mechanisms of formation are discussed.Heating these penta-esters effects cyclisation to xanthyrones having aromatic side-chain termini, (13) and (16), respectively.

Tautomerically Symmetrical and Unsymmetrical Glaucyrones: Reactions with Magnesium Methoxide as a Chelating Base

The first tautomerically unsymmetrical glaucyrone has been made, along with a second symmetrical type; their reactions with magnesium methoxide are informative of the part played by magnesium chelates in the chemistry of multi-1,3-dicarbonyls.