Claims
- 1. A process which comprises reacting a 2,2'-bridged bisphenol corresponding to the formula: ##STR6## with pentaerythritol dichlorophosphite at 20.degree.-150.degree. C. in the presence of a basic catalyst to form a 2,2'-bridged alkyl-aromatic diphosphite corresponding to the formula: ##STR7## in which formulas R and R' are hydrocarbyl groups selected from the group consisting of alkyl, cycloalkyl, and aromatic groups; R" is a divalent group selected from the group consisting of sulfur, sulfoxide, sulfone, and C.sub.1 -C.sub.18 alkylidene groups; n is 0 or 1; and the 2,2'-bridge is a direct bond between the rings when n is 0 and a divalent R" group when n is 1.
- 2. The process of claim 1 wherein the basic catalyst is a tert-amine.
- 3. The process of claim 2 wherein the tert-amine is pyridine.
- 4. The process of claim 1 wherein the pentaerythritol dichlorophosphite that is reacted with the 2,2'-bridged bisphenol is preformed by reacting pentaerythritol with phosphorus trichloride at 20.degree.-150.degree. C. in the presence of the basic catalyst.
- 5. The process of claim 4 wherein the 2,2'-bridged bisphenol is added to the pentaerythritol dichlorophosphite-containing reaction mixture resulting from the pentaerythritol/phosphorus trichloride reaction, and the temperature is maintained at 20.degree.-150.degree. C. until the alkyl-aromatic diphosphite is formed.
- 6. The process of claim 1 wherein the 2,2'-bridged bisphenol is initially mixed with pentaerythritol and phosphorus trichloride at 20.degree.-150.degree. C. in the presence of the basic catalyst so that the pentaerythritol dichlorophosphite reactant is formed in situ.
- 7. The process of claim 1 wherein at least 0.5% by weight of an acid scavenger, based on the weight of the alkyl-aromatic diphosphite, is added to the reaction mixture before the diphosphite is recovered therefrom.
- 8. The process of claim 7 wherein the acid scavenger is selected from alkanolamines and metal carboxylates, oxides, and carbonates and is added in an amount such as to constitute at least 1%, based on the weight of the diphosphite.
Parent Case Info
This application is a continuation of application Ser. No. 08/358,057, filed Dec. 16, 1994, abandoned, which is a continuation of Ser. No. 08/122,440, filed Sep. 24, 1993, now abandoned, which in turn is a continuation-in-part of Ser. No. 07/674,462, filed Mar. 25, 1991, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
9216537 |
Oct 1992 |
WOX |
Non-Patent Literature Citations (2)
Entry |
Mukmeneva et al. "Synthesis of Pentaerythritol diphosphites with enhanced stability to hydrolysis", Journal of General Chemistry of the USSR, vol. 57, No. 12, part 2, Dec. 1987. pp. 2494-2495. |
Journal of General Chemistry of the USSR, vol. 57, No. 12, part 2, Dec. 1987, N. A. Mukmeneva et al. "Synthesis of Pentaerythritol diphosphites with enhanced stability to hydrolysis", pp. 2795-2797. |
Continuations (2)
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Parent |
358057 |
Dec 1994 |
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Parent |
122440 |
Sep 1993 |
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Continuation in Parts (1)
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674462 |
Mar 1991 |
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