3,7,9-Trioxa-1-aza-2,8-diphosphaspiro[4.5]decanes of formula I
 wherein R₁ and R₂ are independently hydrogen, alkyl, cycloalkyl, bicycloalkcyl, tricycloalkyl or aryl; or can be halogen when n or m is zero,
R₃, R₄, R₅ and R₆ are independently hydrogen, alkyl, aralkyl or aryl;
X and Y are independently -O-, -S- or -NR₁₆- where R₁₆ is alkyl, cycloalkcyl, alkenyl, aryl or aralkyl;
W and Z are independently O or S; and
n, m, o and p are independently zero or 1, are effective in stabilizing organic materials against the deleterious effects of oxygen, heat and/or actinic radiation.
                            式 I 的 3,7,9-三氧杂-1-氮杂-2,8-二
磷杂
螺[4.5]癸烷
 其中 R₁ 和 R₂ 独立地为氢、烷基、环烷基、双环烷基、
三环烷基或芳基;或者当 n 或 m 为零时为卤素、
R₃、R₄、R₅ 和 R₆ 独立为氢、烷基、芳烷基或芳基;
X 和 Y 独立地为-O-、-S-或-NR₁₆-,其中 R₁₆ 是烷基、环烷基、烯基、芳基或芳烷基;
W 和 Z 独立地为 O 或 S;以及
n、m、o 和 p 独立地为 0 或 1,可有效稳定有机材料,使其免受
氧气、热量和/或光辐射的有害影响。