980 



SUBJECT INDEX 



Vitamin A methyl ether {continued) : 



SbCl3 reaction, 707 



structure, 707 

 Vitamin A-j3-naphtlioate, absorption 

 maximum, 730 



crystalline, photomicrographs, 673 



extinction coefficient, 730 



melting point, 730 



properties, 674 

 Vitamin A palmitate, absorption maxi- 

 mum, 730 



crystalline, photomicrographs, 673 



elimination maximum, 727 



extinction coefficient, 730 



melting point, 730 



properties, 674 

 Vitamin Ai phenylazobenzoate, absorp- 

 tion maximum, 730 



extinction coefficient, 730 



melting point, 698, 730 



photomicrographs, 699 

 Vitamin A2 phenylazobenzoate. absorp- 

 tion maximum, 730 



extinction coefficient, 730 



melting point, 730 

 Vitamin C (see Ascorbic acid) 

 Vitamins D, introduction, 739-744 



isolation, 742 



multiple nature, 742-744 



occurrence, 770-778 



provitamins and, 744-770 



properties, 778-781 



standards, 781, 782 



structural requirements, 791 



structures, 782-791 



synthesis, 791, 792 

 Vitamin Di, 771 

 Vitamin D2, absorption maximum, 779 



as international standard, 781 



biopotency, 780 



in eggs, 746 



in fish liver oils, 746 



melting point, 778, 781 



molecular extinction curves, 779 



properties, 778-780 



specific rotation, 778. 781 



structure, 783-787 

 Vitamin D3, 771 



absorption maximum, 780 



biopotency, 780 



extinction coefficient, 780 



melting point, 780 



Vitamin D3 (continued) : 



molecular extinction curve, 779 



properties, 780 



specific rotation, 780 



structure, 789, 790 

 Vitamin D4, 771 



biopotency, 780 



melting point, 780 



properties, 780 



specific rotation, 780 



structure, 790 

 Vitamin D.,, 771 



biopotency, 780 



structure, 791 

 Vitamins E, 793-827 (see also Toco- 

 pherol) 



biopotency as related to structure, 820- 

 827 

 chromans and chromenes, 823 

 coumarans and coumarones, 824 

 coumarins. 824 

 hydroquinones, 826, 827 

 of free tocopherols, 820, 821 

 of tocopherol esters, 821 

 on substitution of ethyl for methyl 



group, 821 

 phenols, 825 

 quinones. 825, 826 



definition, 6 



historical, 793-796 



properties, 812-819 



recurrence, 797-804 



standards, 819, 820 



storage, diet and, 799, 800 

 liver and, 801 



structure, 804-809 



synthesis, 809-811 

 Vitamins K, chemical structure and bio- 

 potency. 844-859 



historical, 6, 829-831 



occurrence, 831. 832 



properties, 841-843 



standards, 843 



structure, 832-838 



synthesis, 838-841 

 Vitamin K hydrides, biopotency, 856-858 

 Vitamin Ki, absorption maxima, 842 



biopotency, 845, 846 



extinction coefficient, 842 



occurrence, 831, 832 „ 



redox potential. 842 



structure. 830, 832-836 



