57  US 6,586,507 B2  58  EXAMPLE 61  EXAMPLE 58  EXAMPLE  62  EXAMPLE 63  EXAMPLE 59  EXAMPLE 64  EXAMPLE 65  Example 60  1,3-bis( 4-octadecanoyloxy-2,2,6,6- tetramethy lpiperidin-1-yloxy )-2-methy 1-2-propanol  Aqueous hydrogen peroxide is added to a mixture of  4-octadecanoy loxy-l-oxyl-2,2,6,6-tetramethy lpiperidine  and ferrous chloride tetrahydrate in tert-butyl alcohol at  The title compound is prepared from the free radical  polymerization of the compound obtained in Example 16B. 65  The average molecular weight of the polymer is 1500-3000  amu.  Poly[ 1-(2-hydroxy-2-methylpropoxy )-2,2,6,6- tetramethy lpiperidin-4-y l Methacrylate  The title compound is isolated by high pressure liquid  chromatography from the crude reaction product obtained in  Example 2.  2-Hydroxy-2-methylpropane-1,3-diyl bis([l-(2- hydroxy-2-methylpropoxy)-2,2,6,6- tetramethylpiperidin-4-yl](l-oxy-2,2,6,6- tetramethylpiperidin-4-yl) Sebacate  6,6-tetramethylpiperidine in chlorobenzene. The mixture is  heated to facilitate the reaction. The crude reaction mixture  is passed through silica gel with heptane and then heptane/  ethyl acetate to afford the title compound.  Oligomer of N-(2-[N-[1-(2-hydroxy-2- methy lpropoxy )-2,2,6,6-tetramethylpiperidin-4-y 1]  butylamino ]-s-triazin-4-yl }-N ,N’-bis[l-(2-hydroxy- 2-methylpropoxy)-2,2,6,6-tetramethylpiperidin-4- yl]-1,6-hexanediamine Terminated with Acetyl  Example 54 is repeated except that acetic anhydride is  used in place of 2,4-bis(dibutylamino)-6-chloro-s-triazine  according to the procedure of Example 58. The final product 55  is a mixture of oligomers as described in Example 58  although the ratios of the components may not be identical  to those of the product prepared in Example 58.  Tributyltin hydride is added dropwise to a solution of  1,3-dibromo-2-propanol and excess 4-hydroxy-l-oxyl-2,2,  1,3-bis( 4-hydroxy-2,2,6,6-tetramethylpiperidin-1- yloxy)-2-propanol  Tributyltin hydride is added dropwise to a solution of  1,4-dibromo-2-propanol and excess 4-hydroxy-l-oxyl-2,2,  6,6-tetramethylpiperidine in chlorobenzene. The mixture is  heated to facilitate the reaction. The crude reaction mixture  is passed through silica gel with heptane and then heptane/  ethyl acetate to afford the title compound.  1,4-bis( 4-Hydroxy-2,2,6,6-tetramethylpiperidin-1- yloxy)-2-butanol  The title compound is prepared from the free radical  polymerization of the compound obtained in Example 21.  The average molecular weight of the polymer is 1500-3000  amu.  Poly[ 1-(2-hydroxy-2-methylpropoxy )-2,2,6,6- tetramethylpiperidin-4-y l Acrylate  chloride tetrahydrate in tert-butyl alcohol according to the  procedure of Example 7. The final product is a mixture of  oligomers such as prepared in Example 56 although the  ratios of the individual components may not be the same as  those in the product of Example 56.  Oligomer of N-{2-[N-[1-(2-Hydroxy-2- methy lpropoxy )-2,2,6,6-tetramethylpiperidin-4-y 1]  butylamino ]s-triazin-4-yl }-N,N’-bis[l-(2-hydroxy-2- methylpropoxy)-2,2,6,6-tetramethylpiperidin-4-yl]- 1,6-hexanediamine Terminated with Acetyl  The compounds prepared in Examples 53B and 53C are  mixed together in a 2: 1 molar ratio in xylene at 100---160°  C.  using sodium hydroxide as the acid acceptor. After the  reaction is complete, the reaction mixture is concentrated at  reduced pressure. Acetic anhydride is added to the reaction  mixture at room temperature, and the mixture is then heated  at 130°  C. The crude mixture is cooled and neutralized with  potassium carbonate. The reaction mixture is concentrated at  reduced pressure. The product is a mixture of oligomers that  include 2,4, and 6 repeating units as seen in the structure  below. 