Patent ID: 7572938

Claim:
A process for making a ketone of the formula II, an aldehyde or ketone of the formula III comprising up to 20 carbon atoms, and an aldehyde or ketone of the formula IV comprising up to 20 carbon atoms, wherein A is an aromatic or a heteroaromatic ring; or A is an aromatic or heteroaromatic ring substituted with one or more residues selected from the group of alkyl, aryl, aralkyl, alkenyl, alkynyl, —OH, —O-alkyl, -alkoxyalkoxy, —O-aralkyl, —O-aryl, —O-acyl, —NO 2 , —NH 2 , —NH-alkyl, —N(alkyl) 2 , —NH-acyl, —N(acyl) 2 , —CN, —SH, —S-alkyl, —S-aryl and a halogen atom, selected from fluorine, chlorine or bromine; or A is an aromatic or heteroaromatic ring bearing a residue that together with the carbon atoms to which it is attached forms an aromatic or alicyclic ring, or an aromatic or alicyclic ring bearing one or more heteroatoms selected from oxygen, nitrogen or sulphur, which aromatic or alicyclic ring may be substituted with one or more residues selected from the group of alkyl, alkenyl, and alkynyl residues, R 1 represents hydrogen, alkyl, alkenyl, alkynyl, acyl or aryl residues, and said residues may comprise one or more oxygen atom(s), R 2 , R 3 , R 4 , R 5 represent independently hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl or aromatic residues, and said residues may comprise one or more oxygen atom(s), R 2 and R 3 together with the carbon atom to which they are attached may form a 4 to 18 membered carbocyclic ring optionally substituted by an alkyl, alkenyl or alkynyl residue having up to 10 carbon atoms, and the ring and residues may comprise one or more oxygen atom(s), R 4 and R 5 together with the carbon atom to which they are attached may form a 4 to 18 membered carbocyclic ring optionally substituted by an alkyl, alkenyl or alkynyl residue having up to 10 carbon atoms, and the ring and residues may comprise one or more oxygen atom(s), and n is an integer from 1 to 3, which comprises subjecting to a photoreaction a compound of formula I wherein A, R 1 , R 2 , R 3 , R 4 , R 5 and n are as defined above.