| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c0de99658b7c27b16d950b0086e4b177 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2602-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07B2200-07
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2601-14 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C401-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C401-00 |
| filingDate |
2021-12-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ae15d15c47e9d90475fb5f998e883d19
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d42a8a21a48c2acb70850cdcaa842c73
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3bea2df108d8bcece148a583689d6037
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_687c3993aac0b8d2ac8bf01bca4a1b5c |
| publicationDate |
2022-03-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CN-114213301-A |
| titleOfInvention |
Preparation method of vitamin D3 |
| abstract |
The invention provides a preparation method of vitamin D3, which takes a compound A as a substrate and sequentially carries out photochemical reaction, thermal isomerization reaction, crystallization and hydrolysis reaction to obtain vitamin D3; wherein compound a has the structure of formula I: wherein R is b Is composed of One of (1), R a Is an electron donating group; the illumination condition is ultraviolet illumination. The method for preparing the vitamin D3 can prepare high-purity vitamin D3 crystal without column chromatography, is suitable for large-scale production, and has high yield and strong controllability. |
| priorityDate |
2021-12-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |