Patent ID: 7572928

Claim:
A process for producing a compound of formula (IIIa) wherein R 4 is selected from hydrogen, -alk-H, aryl, -alk-aryl, —O-aryl, —O-alk-aryl-, -alk-O-aryl, -alk-O-alk-aryl, —O-alk-H, -alk-O-alk-H, —C(O)-aryl, —C(O)-alk-aryl, -alk-C(O)-aryl, -alk-C(O)-alk-aryl, —C(O)-alk-H, -alk-C(O)-alk-H, —C(O)N(-alk-H)C(O)O-alk-H, -alk-C(O)N(-alk-H)C(O)O-alk-H, wherein when R 4 is an unsubstituted or substituted hydrocarbon group with two or more carbon atoms it is saturated between C1 and C2; R 10 is selected from C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl and phenyl; R 11 and R 12 , together with the nitrogen atom to which they are attached, represent an N-oxazolidinyl group which is substituted by R 10 or -alk-R 10 ; -alk- is a straight or branched C 1-6 alkylene, C 2-6 alkenylene or C 2-6 alkynylene group which is unsubstituted or substituted by halogen; R 1 , R 2 and R 3 are independently selected from C 1-6 alkyl and phenyl, wherein at least one of R 1 , R 2 and R 3 is not methyl; L is a C 1-3 alkylene group which is unsubstituted or substituted by one or more groups independently selected from R 10 , aryl, -alk-aryl, —C(O)O-alk-H and —C(O)—NR 11 R 12 ; and Nu is —C(O)O—; or L is a C 2-4 alkylene group which is unsubstituted or substituted by one or more groups independently selected from R 10 , aryl, -alk-aryl, —C(O)O-alk-H and —C(O)—NR 11 R 12 ; and Nu is —O—; by attaching a fluoro group gamma to a silane group, which process comprises contacting a source of electrophilic fluorine with a compound of formula (I): wherein R 1 , R 2 and R 3 are independently selected from C 1-6 alkyl and phenyl and at least one of R 1 , R 2 and R 3 is not methyl; G is —C(R 4 )(R 5 )—, R 4 is as defined above, R 5 , R 6 and R 8 are hydrogen; R 7 is -L-NuH; L and Nu are as defined above; and the compound produced is of formula (IIIa) as defined above.