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US 3,947,473 AGranted
Antioxidant chroman compounds
AssigneeHoffman-La Roche Inc.
InventorsJohn William Scott, David Richard Parrish, Gabriel Saucy
Life of this patent
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Abstract
The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
Claims5
A compound of the formula:
- ##SPC26##
- wherein R.sub.1, R.sub.1 ', R.sub.1 " and R.sub.2 are hydrogen or lower alkyl;
- R is hydrogen, lower alkonoyl benzyl, benzoyl;
- R.sub.4 is hydrogen or lower alkyl.
1 more element
Dependencies are inferred from the claim text.