Antioxidants and stabilizers—XXXII. Antioxidative properties of (2-alkoxyalkyl)hydroquinones-products of photochemical changes of benzoquinones

✍ Scribed by E. Lisá; L. Kotuľák; J. Petránek; J. Pospišil

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 610 KB
• Volume: 8
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(72)90113-9

✦ Synopsis

Al~tract--Photochemical reaction of tert.-alkylated 1,4-benzoqulnones leads to (2-alkoxyalkyl)hydroquinones. An investigation was made of their inhibition activities in the oxidation of tetralin (60 °, initiated with azobisisobutyronltrile) and isotactic polypropylene (180 °); the results are compared with the antioxidative activities of alkylated hydroquinones and 1,4-bcnzoquinones. It was demonstratcd, by studying 33 hydroquinone and 13 benzoquinone derivatives, that the alkylation of the hydroquinone causes a general decrease in the inhibition activity; the substitution at positions 2,6 has a particularly negative influence. A substantial increase of the activity of hydroquinone resulting from the introduction of the 2-alkoxyalkyl group was established for both substrates. The most active compounds under investigation were 2-(2-alkoxyalkyl)-and 2,5-bis(2-alkoxyalkyl)hydroquinones. The derivatives of 1,4-bermaquinone were confirmed to have only weak retardation activity.