6 CAPSANTHIN 247 



Solvent Absorption maxima 



Carbon disulphide 557 517 483 m/z 



Benzene 537 499 467 m// 



Cyc/ohexane 524 489 458 m/^ 



Hexane 518 483 453 m/f 



Capsanthylal CgoH^gOg^'-'* : 



CH3 CH3 CH3 CH3 C 



OHC-C=CHCH=CH-C=CHCH=CHCH=C-CH=CHCH=C-CH=CH-CO CHj 



H,C-CH, CHOH 



Capsanthylal 



CH, 



Capsanthylal is formed by the oxidation of capsanthin diacetate with 

 chromic acid^^. If an excess of oxidising agent is employed, smaller degradation 

 products are also obtained. The aldehyde crystallises from 80 % methanol in 

 needles which are grouped in star-like formations. M.p. 127° (corr.). 



Solvent Absorption ^naxiuia 



Carbon disulphide 518 483 452 m/i 



Hexane 483 452 m// 



Capsanthylal is readily soluble in benzene, ethanol and carbon disulphide, 

 but only slightly soluble in petroleum ether. 



Capsanthylal monoxime C30H43O3N: Crystallises from methanol in needles, 

 which are similar in colour to zeaxanthin. M.p. 184°. The oxime is readily 

 soluble in benzene and carbon disulphide and somewhat less soluble in hexane 

 and petrol. 



Solvent Absorption maxima 



Hexane 483 452 m/^ 



Capsylaldehyde C27H38O3 : 



CH, CH« 



I I I /\ 



OHC-CH=CH-C=CHCH=CHCH=C-CH = CHCH=C-CH = CH-CO CH^ 



H,C-CH, CHOH 



Capsylaldehvde 



CHj 



Capsylaldehyde has only been obtained crystalline in the form of its oxime. 

 The formula shown above is assigned to this compound by Zechmeister and 

 VON Cholnoky^^. The oxime crystallises in lemon-yellow needles, m.p. 172°. 

 References p. 253-255. 



