23093-92-7

Upstream product

• 110-89-4 piperidine 
• 7062-57-9 2,6-di-tert-butyl-4-(cyanomethylene)-2,5-cyclohexadien-1-one 
• 1620-98-0 3,5-di-t-butyl-4-hydroxybenzaldehyde 
• 7019-95-6 4-(piperidino)methylene-2,6-di-tert-butylcyclohexa-2,5-dien-1-one 
• 75-86-5 2-hydroxy-2-methylpropanenitrile 

Downstream Products

• 77380-02-0 2,6-ditert-butyl-7-cyano-7-piperidinoquinone methide 
• 77380-03-1 Dicyano(piperidino)(3,5-ditert-butyl-4-hydroxyphenyl)methane 
• 67341-88-2 4-bis(piperidino)methylene-2,6-di-tert-butyl-2,5-cyclohexadienone 
• 7062-57-9 2,6-di-tert-butyl-4-(cyanomethylene)-2,5-cyclohexadien-1-one 

Relevant academic research and scientific papers

Easy large scale syntheses of 2,6-di-t-butyl7-cyano-, 7-carboxy- and 7- methoxycarbonyl quinone methides

Easy large scale syntheses of 2,6-di-t-butyl-7-cyano-, 7-carboxy- and 7- methoxycarbonyl quinone methides 1-3 using cheap and readily available starting materials have been developed.

7-substituted quinone methides as inhibitors for unsaturated monomers

Ethylenically unsaturated monomers are protected from premature polymerization during manufacture and storage by the incorporation therein of an effective stabilizing amount of a 7-substituted quinone methide compound.

SYNTHESIS AND PROPERTIES OF 7,7-DIAMINOQUINONE METHIDES

Diaminoquinone methides Xa-Xe were prepared by aminolysis of the dicyanoquinone methide IX.From the isolated intermediates XI and XIII a four-step mechanism was deduced, involving addition and elimination steps in the order Ad-E-Ad-E.Condensation of N,N,N',N'-tetramethylchloroformamidinium chloride with 2,6-ditert-butylphenol afforded bis(dimethylamino)-quinone methide Xc which on transamination was converted to the diaminoquinone methides Xa and Xb.Analysis of physico-chemical data of diaminoquinone methides leads to the conclusion that their structure can be represented by the zwitterionic formula XVII rather than the quinonoid formula X.