1. A compound of formula (III):
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wherein X is a basic counterion selected from a group I or group II metal and a primary, secondary or tertiary amine:
2. A compound according to claim 1, which is of formula (IIIa):
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3. A compound according to claim 2 wherein X is selected from sodium, cinchonidine, cyclohexylammonium, R-alpha-methylbenzylammonium, S-alpha-methylbenzylammonium and S-2-cyclohexylethylammonium.
4. A process for the preparation of a compound of formula (IIIa) by addition of the base to a compound of formula (VIIa) in a suitable solvent:
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5. A process for the preparation of (1R,5R,6S)-6-(aminomethyl)bicyclo3.2.0hept-6-ylacetic acid, comprising a) conversion of a compound according to claim 2 to the corresponding free nitro acid, followed by b) reduction of the nitro group.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for producing a fibre-reinforced plastic component, the method comprising:
producing a positive arrangement by fixing at least one reinforcement ready to be used on a positive core;
winding fibres around the positive arrangement such that concave regions of the positive arrangement that are formed by the reinforcement are spanned by the fibres;
pressing the entire area of the fibres onto the positive arrangement in a negative mould to produce the component, and then
curing the component in the negative mould following the introduction of a cross-linking plastic.
2. The method of claim 1, wherein the positive core is inflatable.
3. The method of claim 1, wherein the positive core is composed of foamed plastic.
4. The method of claim 1, wherein the at least one reinforcement is composed of at least one of metal, wood and cured plastic.
5. The method of claim 1, wherein the at least one reinforcement comprises a flange.
6. The method of claim 1, wherein the at least one reinforcement has a plurality of projections in a contact region with the fibres.
7. The method of claim 6, wherein the length of the projections corresponds to the wall thickness of the fibre-reinforced plastic.
8. The method of claim 1, wherein fixing at least one reinforcement ready to be used on a positive core is implemented in a form-fitting manner.
9. The method of claim 1, wherein the fibres comprise at least one of glass fibres, Kevlar fibres, aramid fibres, carbon fibres, vegetable fibres and combinations thereof.
10. The method of claim 1, wherein the fibres are processed in the form of at least one of fibre strands, weaves, networks, knits and nonwovens.
11. The method of claim 1, wherein introducing the cross-linking plastic is implemented by impregnating the fibres with a liquid plastic.
12. The method of claim 1, wherein introducing the cross-linking plastic is implemented between winding the fibres and pressing the entire area of the fibres.
13. The method of claim 1, wherein introducing the cross-linking plastic is implemented after pressing the entire area of the fibres.
14. The method of claim 1, wherein curing the component is implemented by heat.
15. The method of claim 1, wherein:
introducing the cross-linking plastic is implemented by using a fibre mixture containing thermoplastic fibres; and
the curing is implemented by heat.
16. A method for producing a fibre-reinforced plastic component, the method comprising:
fixing a plurality of reinforcements to a positive core to thereby produce a positive arrangement;
winding fibres around the positive arrangement such that concave regions of the positive arrangement formed by the reinforcements are spanned;
placing the positive arrangement having the wound fibers in an open, negative mould;
pressing the wound fibers onto the positive arrangement by closing the negative mould, to thereby produce the component;
introducing a cross-linked plastic by impregnating the fibres with a liquid plastic; and then
curing the component in the negative mould.
17. The method of claim 16, wherein:
the positive core is composed of foamed plastic;
the reinforcements are composed of one of metal, wood and cured plastic; and
the fibres comprise at least one of glass fibres, Kevlar fibres, aramid fibres, carbon fibres, vegetable fibres and mixtures thereof.
18. The method of claim 16, wherein the reinforcements comprise flanges configured to permit the plastic component to be connected to other components.
19. The method of claim 16, wherein the positive core includes depressions configured to receive by form-fit the reinforcements.
20. A method for producing a fibre-reinforced plastic component, the method comprising:
fixing a plurality of reinforcements to a positive core to thereby produce a positive arrangement;
winding a fibre mixture containing thermoplastic fibres around the positive arrangement;
placing the positive arrangement having the wound fibre mixtures in a negative mould;
producing the component by pressing the wound fibers onto the positive arrangement; and then
heating the component.