Claims
- 1. A method of preparation of photoprecursors comprising the steps of:(a) nitrating an aromatic aldehyde or ketone XI to provide the o-nitro derivative XII; (b) reducing said o-nitro derivative XII to the corresponding alcohol XIII; and (c) reacting said alcohol XIII with mono- or diisocyanates to provide 2-nitrobenzyl urethane derivatives I or VIII as follows:
- 2. A method as defined in claim 1 wherein said ketone is selected from acetophenone or 3,4-dimethoxyacetophenone.
- 3. A method as defined in claim 1 wherein said mono- or di-isocyanate is selected from butyl isocyanate, hexane-6,6-diisocyanate, phenyl isocyanate, 4,4′-diisocyanatodiphenylmethane or 4-nitrophenylisocyanate.
- 4. A method as defined in claim 1 wherein said aldehyde or ketone is selected from a bisaldehyde or bisketone, said mono- or di-isocyanate comprises a di-isocyanate, and said photoprecursor comprises a polymeric photoprecursor.
- 5. A method of preparation of photoprecursors comprising the steps of:(a) nitrating an aromatic aldehyde or ketone XI to provide the o-nitro derivative XII; (b) reducing said o-nitro derivative XII to the corresponding alcohol XIII; (c) reacting said alcohol XIII with carbonyl chloride to provide the corresponding chlorocarbonate XIV; and (d) condensing said chlorocarbonate XIV with a secondary amine to provide 2-nitrobenzyl urethane derivatives I
- 6. A method as defined in claim 5 wherein said ketone is selected from acetophenone or 3,4-dimethoxyacetophenone.
- 7. A method as defined in claim 5 wherein said secondary amine is selected from an optionally substituted dialkylamine.
- 8. A method as defined in claim 7 wherein said dialkylamine is selected from diethylamine or diisopropylamine.
- 9. A method as described in claim 1 wherein said electron donating group is an alkyl or an alkoxy.
- 10. A method as defined in claim 5 wherein said electron donating group is an alkyl or an alkoxy.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9727186 |
Dec 1997 |
GB |
|
Parent Case Info
This is a division of application Ser. No. 09/218,079 filed Dec. 22, 1998 now U.S. Pat. No. 6,171,756.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5820944 |
Harkness et al. |
Oct 1998 |
A |
Non-Patent Literature Citations (1)
Entry |
Tetrahedron Letters, 29(1), 1988, pp. 65-68. |