Method for preparing functional halosilanes

Abstract

The present invention relates to a method for preparing functional halosilanes by reacting (A) a cyclic silyl ether having the formula wherein each R is independently selected from a hydrocarbyl group or a halogen-substituted hydrocarbyl group having 1 to 20 carbon atoms, each R′ is independently selected from a group consisting of hydrogen and R and b is 3, 4 or 5; and (B) a halogen-functional compound having a formula selected from wherein G is an m-valent organic group, m is at least 2, X is halogen, R″ is independently selected from hydrocarbyl groups or halogen-substituted hydrocarbyl groups having 1 to 20 carbon atoms, j is an integer having a value of 1 to 3 and k is an integer having a value of 1 to 3.

That which is claimed is:  
     
         1 . A functional halosilane comprising the reaction product of 
 (A) a cyclic silyl ether having a formula selected from the group consisting of  
                 
   wherein each R is independently selected from a hydrocarbyl group or a halogen-substituted hydrocarbyl group having 1 to 20 carbon atoms, each R′ is independently selected from a group consisting of hydrogen and R and b is 3, 4 or 5; and    (B) a halogen-functional compound having a formula selected from  
                 
   wherein G is an m-valent organic group selected from hydrocarbyl groups or hydrocarbyl groups containing at least one hetero atoms selected from oxygen, nitrogen or sulfur, m is at least 2, X is halogen, R″ is independently selected from hydrocarbyl groups or halogen-substituted hydrocarbyl groups having 1 to 20 carbon atoms, j is an integer having a value of 1 to 3 and k is an integer having a value of 1 to 3.    
     
     
         2 . The functional halosilane according to    claim 1   , wherein X is chlorine.  
     
     
         3 . The functional halosilane according to    claim 2   , wherein said cyclic silyl ether has a formula selected from  
                   
       wherein each R is independently selected from methyl, phenyl or trifluoropropyl and R′ is selected from hydrogen or methyl.  
     
     
         4 . The functional halosilane according to    claim 3   , wherein said cyclic silyl ether is 2,2,4-trimethyl-1-oxa-2-silacyclopentane.  
     
     
         5 . The functional halosilane according to    claim 4   , wherein said halogen-functional compound has the formula  
                   
       wherein G is an alkylene group having 6 to 20 carbon atoms.  
     
     
         6 . The functional halosilane according to    claim 4   , wherein said halogen-functional compound has the formula selected from  
                   
       wherein R″ is selected from alkyl groups having 1 to 10 carbon atoms, alkenyl groups having 2 to 20 carbons or aryl groups having 6 to 10 carbons, j is an integer having a value of 1 to 3 and k is an integer having a value of 1 to 3.  
     
     
         7 . The functional halosilane according to    claim 4   , wherein said a halogen-functional compound has the formula selected from  
                   
       wherein R″ is selected from alkyl groups having 1 to 10 carbon atoms, phenyl or tolyl.  
     
     
         8 . The functional halosilane according to    claim 1   , wherein G contains at least one hetero atom.  
     
     
         9 . The functional halosilane according to    claim 8   , wherein X is chlorine and said cyclic silyl ether has a formula selected from  
                   
       wherein each R is independently selected from methyl, phenyl or trifluoropropyl and R′ is selected from hydrogen or methyl.  
     
     
         10 . The functional halosilane according to    claim 9   , wherein said cyclic silyl ether is 2,2,4-trimethyl-1-oxa-2-silacyclopentane.