# US 6,566,570 B1 · Process for preparing cyclic monomers

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- Number: US 6,566,570 B1
- Document ID: US6566570B1
- Status: Granted
- Kind: B1
- Application number: 09/601,647
- Filed: 2000-08-04
- Granted: 2003-05-20
- Earliest claimed: 1998-02-06
- Assignees: Optatech Corporation
- Inventors: Christer Bergström; Arto Mölsä; Juhana Ruotoistenmäki
- Web page: https://patentgrep.com/patent/US6566570B1

## CPC

- C07C 13/68: with a bridged ring system
- C07C 13/42: with a bicycloheptene ring structure
- C08F 32/08: having two condensed rings (coumarone-indene polymers C08F244/00)
- C08G 61/08: of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
- C07C 2602/42: the bicyclo ring system containing seven carbon atoms
- C07C 2603/86: containing four rings
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A process for producing an unsaturated cyclic compound, comprising the steps of hydrochlorinating a terpene to produce a hydrochlorinated terpene, and subjecting the hydrochlorinate terpene to elimination of hydrogen chloride to form an unsaturated cyclic compound. The terpene is preferably α-pinene, β-pinene, camphene or suitable turpentine fraction. The cyclic compounds can be used as monomers and by means of the invention it is thus possible to produce plastics from renewable raw material sources.

## Claims

### Claim 1

A process for producing 1,7,7-trimethy-norbornene, comprising:
a) hydrochlorinating a terpene to produce a hydrochlorinated terpene, and
b) subjecting the hydrochlorinated terpene to an E2-elimination of hydrogen chloride to form 1,7,7-trimethyl-norbornene.

### Claim 2 (depends on 1)

The process of claim 1, wherein the terpene is a α-pinene, β-pinene, camphene or a suitable turpentine fraction.

### Claim 3 (depends on 1)

The process of claim 1, wherein the E2-elimination is performed using an alkaline compound.

### Claim 4 (depends on 3)

The process of claim 3, wherein the alkaline compound is potassium-tert.-butoxide.

### Claim 5 (depends on 1)

The process of claim 1, wherein the 1,7,7-trimethyl-norbornene is reacted with cyclopentadiene to form a Diels-Alder adduct.