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7211172 |
Method of photochemical synthesis of vitamin Ds
An enhanced photochemical method of making vitamin D includes irradiating a reaction mixture of precursor molecules with light having a wavelength of 254 nm and with light having a wavelength of...
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6902654 |
Ultraviolet irradiation apparatus for photochemical reaction and preparation process of vitamin D derivative making use of the same
A process for preparing a vitamin D derivative including providing an ultraviolet irradiation apparatus for photochemical reactions, which has an ultraviolet radiation-emitting lamp, an optical...
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6660132 |
Photochemical and thermochemical solar syntheses using flat-bed solar collectors/solar reactors
The invention relates to a method for carrying out photochemical and thermochemical solar syntheses by means of flat-bed solar light collectors without devices for focusing the sunlight. The method...
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6444098 |
Process for the preparation of tocol acylates and tocopherol acylates
The present invention relates to a process for preparing tocol acylate or tocopherol acylate having the following steps: a) combining tocol or tocopherol with an acylating agent to form a reaction...
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6180805 |
Photochemical process for the production of previtamin D3
A photochemical process for the production of previtamin D 3 or a derivative thereof from 7-dehydrocholesterol is disclosed. The process includes irradiating the 7-dehydrocholesterol in a reactor...
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6045664 |
Process for the photochemical sulphochlorination of gaseous alkanes
For manufacturing an alkanesulphonyl chloride by photochemical reaction of an alkane with chlorine and sulphur dioxide, the light source used is a gallium-doped medium-pressure mercury lamp.
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5543016 |
Photoconversion of steroids in microreactors
The photoconversion of steroids is carried out in microreactors to yield desired products, while limiting the formation of undesirable byproducts. The steroid reactant is combined with a...
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5436401 |
22-oxacholecalciferol derivative and process for preparing the same
A 22-oxacholecalciferol derivative represented by formula (I): ##STR1## wherein R 1 represents a hydrogen atom or a hydroxyl group; and R 2 and R 3 , which may be the same or different, each...
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5424465 |
Preparation of 13-(Z)-retinoic acid
13-(Z)-Retinoic acid is prepared by a) reacting 5-hydroxy-4-methyl-2(5H)-furanone with a [3-methyl-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4-pentadie
nyl]triarylpho sphonium salt and b)...
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5338418 |
Process for production of hydroxocobalamin
A process for the production of hydroxocobalamin that eliminates cyanocobalamin as an intermediate. Co-enzyme-type vitamin B 12 is first absorbed to a divinylbenzene/styrene resin which is washed...
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5252191 |
Method for the photochemical isomerization of organic compounds under the influence of a photosensitizer
The invention relates to a method for the photochemical isomerization of organic compounds, in particular for the photochemical conversion of tachysterol compounds into previtamin D compounds and...
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5021452 |
Process for enhancing wound healing
There is disclosed a process for improving wound healing, comprising administering ascorbate or derivatives thereof to a wound site at a concentration of at least 20 μmol/L and irradiating the...
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4937292 |
Photosensitizer
Photochemical conversion of tachysterols to previtamins is conducted in the presence of a polymeric photosensitizer which has the appropriate chromophore groups, e.g. anthracene groups, attached to...
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4835258 |
Conjugation of aromatic amines or nitro-containing compounds with proteins or polypeptides by photoirradiation of the azide derivatives with ultraviolet light in order to produce antibodies against the haptens
A method of linking primary aromatic amine- or nitro-compounds to carrier proteins by photochemical reactions in order to produce antibodies against the haptens.
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4686023 |
Sensitized photochemical preparation of vitamin D
Tachysterol-2 or tachysterol-3 is photochemically converted in high yield to previtamin D 2 or previtamin D 3 respectively, by irradiation in the presence of anthracene as photosensitizer. The...
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4609444 |
Photochemical reactions for commercial synthesis
Photochemical reactions are conducted using polymer beads arranged as a monolayer, e.g. floating on the surface of a moving body of water. The polymer bead is impregnated with a reactant, floated...
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4551214 |
Photochemical preparation of previtamin D
Compounds of the formula ##STR1## wherein R 1 -R 4 is hydrogen or chlorine, R 5 is --COOMe or --SO 3 Me, Me is an alkali metal cation and X is oxygen, sulfur or selenium, photosensitizers for...
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4517125 |
Novel vitamin D.sub.3 derivatives and process for producing the same
There are disclosed 6,19-epidioxyvitamin D 3 derivatives which are represented by the formula ##STR1## wherein R 1 , R 2 and R 3 are each a hydrogen atom or a hydroxyl group; when R 1 is a...
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4490226 |
Efficient photochemical formation of 1-α-hydroxyprevitamin D.sub.3
An improved method is set out for converting a reactant having a reactant core portion, 5,7-androstadiene-1α,3β-diol, into a product having a product core portion,...
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4265822 |
Process for preparing 1-hydroxylated vitamin D compounds from 5,6-trans-vitamin D compounds
A method for preparing 1α-hydroxylated vitamin D compounds from 5,6-trans-vitamin D compounds which comprises allylically oxidizing a 5,6-trans-vitamin D compound, subjecting the oxidation product...
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4026778 |
Photochemical isomerization of vitamin A compounds
A novel procedure for photochemical isomerization of vitamin A compounds or derivatives thereof in the absence of sensitizers is disclosed.
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4001096 |
Process for preparing 25-hydroxycholecalciferol intermediates
A method for preparing 9β, 10α-cholesta-5,7-diene-3β,25 diol and 25-hydroxyprevitamin D 3 by irradiation.
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3929770 |
Process for preparation of steroid derivative
1α-hydroxychlecalciferol is prepared by reacting cholestra-1,5,7-trien-3β-ol with a triazoline-3,5-dione derivative represented by the formula: ##SPC1## Wherein R 1 represents an alkyl group or...
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3491007 |
METHOD FOR INCREASING THE VITAMIN D CONTENT OF YEAST
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2920083 |
Method of producing a compound which is capable of increasing the calcium content ofthe blood
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2862934 |
Method of producing tachysterol and dihydrotachysterol
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2847426 |
Method of preparing tachysterol
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2840575 |
Method of producing an isomerisation product of vitamin d or an ester thereof
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3838029 |
Title is not available
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3794573 |
Title is not available
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3661939 |
Title is not available
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3575831 |
Title is not available
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