Patent ID: 8088955

Claim:
An alpha-substituted α,β-unsaturated E- or Z-aldehyde or isomeric mixture thereof of the formula (I), or the corresponding salt, in which R 1 and R 2 may be identical or different and are each H or an optionally substituted hydrocarbon which optionally has one or more heteroatoms, in which the hydrocarbon may especially be an oxygen protecting group, and in which R 1 and R 2 may optionally be bonded to one another to form a ring structure; and R 3 and R 4 may be identical or different and are each an optionally substituted hydrocarbon with 1-6 C atoms, which optionally has one or more heteroatoms, and in which R 3 and R 4 may be bonded to form a ring structure.