Two atom bridged dicarbonate compounds as internal donors in catalysts for polypropylene manufacture

Abstract

A compound suitable for use as an internal electron donor having a structure: wherein R 1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; R 2 is independently at each occurrence, a hydrogen atom or aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; and R3 is an aliphatic hydrocarbyl group having 1 to 3 carbon atoms.

What is claimed is: 
     
         1 . A compound suitable for use as an internal electron donor having a structure: 
       
         
           
           
               
               
           
         
         wherein R 1  is independently at each occurrence, an aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; R 2  is independently at each occurrence, a hydrogen atom or aliphatic or aromatic hydrocarbon, or substituted hydrocarbon group containing from 1 to 20 carbon atoms; and R3 is an aliphatic hydrocarbyl group having 1 to 3 carbon atoms. 
       
     
     
         2 . The compound of  claim 1  wherein R1 is independently at each occurrence, an aliphatic or aromatic hydrocarbon group containing from 1 to 6 carbon atoms; and R2 is independently at each occurrence, a hydrogen atom or aliphatic or aromatic hydrocarbon group containing from 1 to 6 carbon atoms; and R3 is an aliphatic hydrocarbyl group having 1 to 3 carbon atoms. 
     
     
         3 . The compound of  claim 1  wherein R1 is independently at each occurrence, a methyl, ethyl, isopropyl, t-butyl, or phenyl group; and R2 is independently at each occurrence, a hydrogen atom or a methyl, ethyl, or isopropyl group; and R3 is a methyl, ethyl, or isopropyl group. 
     
     
         4 . The compound of  claim 1  wherein R1 is independently at each occurrence, an ethyl, isopropyl, t-butyl, or phenyl group; and R2 is independently at each occurrence, a hydrogen atom; and R3 is a methyl or isopropyl group.