Phosphite stabilizer for lubricating base stocks and thermoplastic polymers

1. A compound of the structure:

wherein R 1 is C 4 -C 10 alkyl;

R 2 and R 3 , together with the carbons to which they are attached, form a C 5 -C 18 aryl ring;

R 4 is selected from the group consisting of n-butyl, isobutyl, 2,2,3,3-tetramethylbutyl, n-pentyl, 1,3-dimethylpentyl, 3-ethyl-2-methylpentyl, 3-ethyl-3-methylpentyl, 2,3,3-trimethylpentyl, 2,2-dimethylhexyl, 2,3,4-trimethylpentyl, n-hexyl, 1,4-dimethylhexyl, 2,3-dimethylhexyl, 2,5-dimethylhexyl, 2-ethyl-hexyl, 3-ethyl-hexyl, n-heptyl, 2-methylheptyl, 3-methylheptyl, 4-methylheptyl, 1,5-dimethylheptyl, n-octyl, octyl, iso-octyl, nonyl, decyl, C 4 -C 22 cycloalkyl, and C 5 -C 8 aryl; and

R 5 is selected from the group consisting of H, C 1 -C 22 alkyl, C 2 -C 22 alkenyl, C 4 -C 22 cycloalkyl, and C 5 -C 8 aryl.

2. A compound of the structure:

wherein R 1 and R 4 are each independently selected from the group consisting of 2-ethyl-hexyl, n-octyl, and iso-octyl;

R 2 and R 3 , together with the carbons to which they are attached, form a C 5 -C 18 aryl ring; and

R 5 is selected from the group consisting of H, C 1 -C 22 alkyl, C 2 -C 22 alkenyl, C 4 -C 22 cycloalkyl, and C 5 -C 8 aryl.

3. A compound of structure (III):