http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CH-683691-A5
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3e9445e5e3626f36e932c6451a928250 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D493-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D493-10 |
| filingDate | 1990-06-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c91e86cdbd46d264f04643dd20ad78ec http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0f391cdc6574fbf4de8d04c13b4a5078 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_66b1a42cc4e2a53777bb8b72de8562d0 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9bd72a5bcd1bdec50b056b081854bd62 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5c87d64a8c5d71d3efc5cfbd4d2e2b97 |
| publicationDate | 1994-04-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CH-683691-A5 |
| titleOfInvention | Process for the preparation of fluoran compounds. |
| abstract | Fluorene derivs. of general formula (I), where R, R1, R2, R4 are H, or halogen atoms, low C alkyl- or alkoxy- gps.; R3 is H or halogen atom, loW C alkyl or alkoxy gp. or a gp. of formula (IV) -NX3X4; X1, X2, X3 and X4 = H atom, opt. substd. 1-12C alkyl gp. = H atom or alkyl gp. or formyl gp. or an alkenoyl gp. are prepd. as follows: (1) A keto-acid (II) and a phenol deriv. (III) react. (2) The reaction prod. of (stage (I)) is added to a mix contg. non poker solvent, a base, and water at 50-90 deg.C. (3) Organic phase is sepd.. (4) Organic solvent is removed. @(1pp Dwg.No.0/0)@ |
| priorityDate | 1989-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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