A Dictionary of Chemistry and the Allied Branches of Other Sciences, Tập 8Longmans, Green, and Company, 1879 |
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... Purpurin , natural or artificial , when similarly treated , gives the same final result , but does not appear to be first converted into alizarin , the deep red alkali reaction of purpurin quickly passing into wine - red , but not into ...
... Purpurin , natural or artificial , when similarly treated , gives the same final result , but does not appear to be first converted into alizarin , the deep red alkali reaction of purpurin quickly passing into wine - red , but not into ...
Trang 102
... purpurin . With alkalis it gives a blue solution with a slight violet tint ; with baryta , a beautiful blue - violet compound ; with alumina , a red lake with a violet shade ; and with magnesia , a deep blue violet . The weak alkaline ...
... purpurin . With alkalis it gives a blue solution with a slight violet tint ; with baryta , a beautiful blue - violet compound ; with alumina , a red lake with a violet shade ; and with magnesia , a deep blue violet . The weak alkaline ...
Trang 103
... purpurin by reduction with stannous chloride ( Schützenberger ) or with phosphorus . A hot alkaline solution of purpurin dissolves phosphorus without evolution of hydrogen , and the purpurin is quickly reduced to purpuroxanthin , which ...
... purpurin by reduction with stannous chloride ( Schützenberger ) or with phosphorus . A hot alkaline solution of purpurin dissolves phosphorus without evolution of hydrogen , and the purpurin is quickly reduced to purpuroxanthin , which ...
Trang 104
... purpurin ( partly purified as above ) from boiling alcohol . This mother - liquor , which also contained alizarin , purpurin , and a substance ( not yet identified ) soluble in boiling baryta - water , was evaporated to dryness , and ...
... purpurin ( partly purified as above ) from boiling alcohol . This mother - liquor , which also contained alizarin , purpurin , and a substance ( not yet identified ) soluble in boiling baryta - water , was evaporated to dryness , and ...
Trang 105
... purpurin . CO II . Dioxyanthraquinones , CH ( OH ) < CO CH ( OH ) . 4 and 5. Anthrañavic and Iso - anthraflavic Acids ( Schunck a . Roemer , Deut . Chem . Ges . Ber . viii . 1628 ; ix . 379 ; Perkin , Chem . Soc . Jour . 1876 , i . 851 ) ...
... purpurin . CO II . Dioxyanthraquinones , CH ( OH ) < CO CH ( OH ) . 4 and 5. Anthrañavic and Iso - anthraflavic Acids ( Schunck a . Roemer , Deut . Chem . Ges . Ber . viii . 1628 ; ix . 379 ; Perkin , Chem . Soc . Jour . 1876 , i . 851 ) ...
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1st Suppl 2nd Suppl acetic acid action alcohol and ether alcoholic solution aldehyde alkalis ammonia ammonium amorphous anhydride anhydrous aniline aqueous solution barium salt benzene boiling bromine calcium carbon dioxide cent Chem chloral chloride chloroform chromic acid cinchonine cold water colour colourless composition compound Compt containing converted cooling copper crystallises crystallises from alcohol crystals decomposed decomposition Deut dilute distillation easily soluble ether ethyl evaporated excess ferric filtered formation formed formula grams heated hot water hydrate hydriodic acid hydrobromic acid hydrochloric acid hydrogen insoluble iodide iodine laminæ Liebig's Annalen liquid mixed mixture nitrate nitric acid numbers obtained oxalate oxide oxidised potash potassium salt powder precipitate prepared prisms pure purified purpurin reaction residue sealed tubes separates silver slightly soluble small quantity sodium sodium carbonate solidifies soluble soluble in alcohol soluble in water sparingly soluble substance sulphate sulphide sulphuric acid thiocyanate treated yellow yields