Disclosed herein is an improved and efficient process for synthesis of vitamin D3 and its analogue Calcifediol from Ergosterol. Particularly, the present invention discloses the synthesis of key intermediate 3β-tert-Butyldimethylsilyloxy-22-hydroxy-23,24-bisnorchola-5,7-diene (5), and novel ...
Process for producing vitamin D3 derivatives The present invention is directed to a novel process for producing chromane derivatives, which are suitable as intermediates for the manufacture of d-α-to... 被引量: 0发表: 0年 Novel vitamin D.sub.3 derivative and process for preparing the same ...
This invention relates to the synthesis of vitamin Be and to various intermediates employed in its production. In a co-pending application, Serial No. 267,603, is shown a process for the production of vitamin Be, in which 3-cyano-4-ethoxymethyl-5-nitro-6methyl-pyridone-2 is chlorinated wit...
- 《Chemistry of Materials》 被引量: 0发表: 2016年 Green synthesis of Ag nanoparticles using Vitamin C (Ascorbic Acid) in a batch process Nanoparticles of different materials have hitherto been synthesized and are continuously being synthesized by bringing about reduction of certain metallic ... ...
powder, on the (b), at least one vitamin and / or trace element and / or plant extract is applied, and (b) at least one binder in crystalline or agglomerated form, as well as a process for its preparation and the use of this vitamin preparation as a food supplement and / or drugs...
a1 set aircompress tank 1辆集合aircompress坦克[translate] aVitamin C stimulates the natural cell process of collagen fibre synthesis, ensuring the skin's renewed vitality. 维生素C刺激胶原纤维综合的自然细胞过程,保证皮肤的更新的生命力。[translate]...
25-Carboxylic acid derivatives in the vitamin D series having modifications in the 20-position, processes for their preparation, intermediates for these pr... The novel 25-carboxylic acid derivatives of the general formula I in which R and R each are a hydrogen atom or together are an exocycl...
[translate] aThe present invention relates to an improved process for producing E-4-acetoxy-2-methyl-2-butenal, a C5 acetate which can be used in Vitamin A synthesis. In 当前发明与一个被改进的过程关连为生产E 4 acetoxy 2甲醇2 butenal,可以用于维生素A综合的C5醋酸盐。 在 [translate] ...
Date Aug. 6, 1992.23-Oxa-derivatives in the vitamin D series of formula I <IMAGE> (I) are described in which R1, R2 and R4 independently of one another mean a hydrogen atom or an acyl group with 1 to 9 carbon atoms, R3 each means a hydrogen atom or each a linear or branched ...
Mutants of 2,5-diketo-D-gluconic acid reductase A, an enzyme used to produce 2-keto-L-gulonic acid, a precursor of ascorbic acid (vitamin C) are prepared b... RA Lazarus,M Hurle,S Anderson,... - 《Biotechnology Advances》 被引量: 26发表: 1997年 PROCESS FOR PRODUCING 2-KETO-L-GUL...