Patent ID: 6492563
Filing Date: 2002-12-10
Classification: C07C,C11D

Abstract:
A fragrance precursor of formula I: for a fragrant ketone of formula II: and a fragrant ester of formula III: wherein, R1 to R5 represent independently H, â€”NO2, linear or branched C1-C6-alkyl, C1-C6-alkenyl, C1-C6-alkinyl or C1-C4-alkoxy, R1 and R2, R2 and R3, R3 and R4 and R4 and R5 may form together one or two aliphatic or aromatic rings, these rings may optionally contain linear or branched C1-C4-alkyl, C1-C4-alkenyl or C1-C4-alkinyl residues, and the above rings and residues may comprise one or more oxygen atoms, R6 and R7 are independently H, linear or branched C1-C6-alkyl-, C1-C6-alkenyl, C -C6-alkinyl, and R6 or R7 may form with either R1 or R5 a carbocyclic ring optionally substituted by an aliphatic residue, R8 is the residue of an aliphatic acid having 1 to 4 carbon atoms and R9 is the residue of an aliphatic alcohol having 2 to 20 carbon atoms.