Dental materials based on acrylic-ester phosphonic acids
   
   

Acrylic ester phosphonic acids of general formula (I), stereoisomers thereof and mixtures of these, ##STR1##

wherein n is 1 or 2, on the condition that for n=1 R1 has the meaning ##STR2##

and for n=2 R1 has the meaning ##STR3##

R2 is a C1 to C12 alkylene radical, C4-C8 cycloalkylene radical or C7 to C15 alkylene phenylene radical; R3 is hydrogen, a C1 to C5 alkyl radical or a C1 to C5 O-alkyl radical; and R4, R5, independently of each other, each stand for a C1 to C5 alkyl radical or a C1 to C5 O-alkyl radical.

 
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