US 4,197,411 A · Bicyclic aldehydes

Abstract

2-Halomethyl-, 2-alkoxymethyl- and 2-acyloxymethyl-3-methyl-3-formyl-bicyclo[2.2.1]heptane and -hept-5-ene and a process for their preparation. The new compounds are obtained by reacting cyclopentadiene or dicyclopentadiene with the corresponding 4-halo-, 4-alkoxy- or 4-acyloxy-2-methyl-crotonaldehydes under the conventional conditions for Diels-Alder reactions, with or without subsequent catalytic hydrogenation of the Diels-Alder adduct obtained. The new compounds provide an industrially easily realized and advantageous method of synthesis of the sought-after essential ingredients of natural sandalwood oils.

Claims6

Dependent claims

A bicyclic aldehyde of the general formula I ##STR7## where X is Cl, Br, --OR or--O--CO--R, R is a saturated hydrocarbon radical of 1 to 10 carbon atoms and the broken line may represent an additional C--C bond.

Dependencies are inferred from the claim text.

Facts

Application

05/898,036Filed 20 Apr 1978

Priority

DE 27199764 May 1977

Granted

8 Apr 1980

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C07C 47/457
Unsaturated compounds having —CHO groups bound to carbon atoms of rings other than six—membered aromatic rings: containing halogen
C07C 45/62
By reactions not involving the formation of >C = O groups: by hydrogenation of carbon-to-carbon double or triple bonds
C07C 45/69
By increase in the number of carbon atoms: by addition to carbon-to-carbon double or triple bonds
C07C 47/353
Saturated compounds having —CHO groups bound to carbon atoms of rings other than six—membered aromatic rings: containing halogen

Abstract

Claims6

Dependent claims

Dependencies are inferred from the claim text.

Bicyclic aldehydes

Life of this patent

Abstract

Claims6

Bicyclic aldehydes

Life of this patent

Abstract

Claims6