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1997-09-02 |
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Process for the preparation of 3-substituted thiophenes |
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1996-04-30 |
| 5198559 |
N-acyl and O-acyl derivatives of N,N-bis(2,2-dimethyl-3-hydroxypropyl)amine, their preparation and use |
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| 4952546 |
Catalyst system for selective alkylation of toluene |
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