| abstract |
1390006 Phenoacetals of aromatic 1,2-diketones CIBA-GEIGY AG 27 July 1973 [28 July 1972 28 June 1973] 35844/73 Heading C2C [Also in Division C3] The invention comprises compounds of Formula I wherein R<SP>1</SP> represents C 1 to C 5 alkyl, <SP>C</SP> 2 to C 3 alkenyl, C 7 to C 9 aralkyl, C 8 to C 9 aralkenyl or a group -(CH 2 ) n -X, wherein X represents halogen, OR<SP>3</SP>, -SR<SP>3</SP>, -OAr<SP>3</SP>, -SAr<SP>3</SP>, or n = 1 to 3, R<SP>2</SP> represents a group or -(CH 2 ) 3 -, R<SP>3</SP> represents a C 1 to C 4 alkyl, R<SP>4</SP> represents a C 1 to C 18 alkyl and Ar<SP>1</SP>, Ar<SP>2</SP> and Ar<SP>3</SP> each independently represent a phenyl radical unsubstituted or at most trisubstituted by halogen, alkyl or -O-alkyl having 1 to 4 carbon atoms or by phenyl, or, of Ar<SP>1</SP> or Ar<SP>2</SP> or Ar<SP>1</SP> and Ar<SP>2</SP> represent a phenyl radical substituted as defined, R<SP>1</SP> and R<SP>4</SP> can also represent hydrogen. These compounds of Formula I may be prepared by reacting an aromatic 1,2-diketone either with sulphurous acid ester in the presence of an anhydrous acid and a primary monoalcohol, or with thionyl chloride and a primary monoalcohol. |