Full text: Natürliche organische Farbstoffe (2. Band)

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enger ERTL TREE TTTETE ET TEE TEE TEE ER TETE Dr ee me tee BaLe LE nen ana 0 ea nA nn ann ee 
53 Carotinfarbstoffe (Polyenfarbstoffe, Lipochrome). 
Das oben erwähnte Bixan! ist als 4-8-13-17-Tetramethyleikosan zu 
bezeichnen. 
Schließlich ist es auch noch gelungen aus Perhydrocrocetin Perhydro- 
norbixin aufzubauen?: 
CH, CH, CH, CH, 
| | | 
HO0C-CH-CH;-CH,-CH,-CH-CH, CH,-CH,-CH,-CH-CH,-CH,-CH,-CH-C00H 
Perhydrocrocetin y verestert 
CH, CH, CH, CH, 
| | | 
ROOC-CH-CH,-CH,-CH, CH-CH,-CH,-CH,-CH, CH-CH, CH,-CH,-CH-C00R 
y Reduktion. 
CH, CH, CH, CH, 
| | | 
HOH,0-CH-CH,-CH,-CH,-CH-CH,-CH,-CH,-CH,-CH-CH,-CH,-CH,-CH-CH,OH 
Y Bra 
CH, CH, CH, CH, 
| | | 
BrH,0-CH-CH,-CH,-CH,-CH-CH,-CH,-CH,-CH,-CH-CH;-CH,-CH,-CH-CH,Br 
y Malonestersynthese 
CH, CH, CH, Oi, . 
| el a Bi a 
KROO0,-E-0 00 0 0 6-00 ee 0 6A 00 € 020. DOOR), 
HBHHH,H,H,HH,H,H,H,HH,H,H,HH,H 
y Abspaltung einer Carboxylgruppe und Verseifung 
CH, CH, CH, H, 
BO OO 00-800 OH 
BB, HH, H,H,HH,HH,HMHH,H,H,HH,H, 
Perhydronorbixin. 
Auch Perhydronorbixin läßt sich zu Perhydrocrocetin® abbauen. 
CH, CH, CH, CH, 
| | | 
H00C—C—06—06—0—6-—6—0—0—0—0—1——6—0—6—6—60—C6—6—C00H 
B,H,HH,H,H,HH,H,H,H,HH,H,H,HH,H, 
Perhydronorbixin, abgebaut (vgl. S. 51) zu 
CH, CH, CH, CH, 
| | | | wi 
HO0C—C—0-—6-—6-—0-—6-—0-06--6-—0-—0-—6—6—0-—665—C600H 
HB, HHM,H,H,HH,H,HH,HH,H,H, HH, 
OH OH CH, CH, CH, CH, OH OH 
HC | | | | CH, 
30 — CH—CH—C—0—0-0—0—0—0—0—0—0—0—0—CH—CH—X |, 
H,;0 BH,EBHH,H,H,HHH,H,H, CH, 
Y 
CH, CH, CH, CH, 
I | 
OHC-CH-CH,-CH,-CH,-CH-CH,-CH,-CH,-CH,-CH-CH;-CH,-CH,-CH-CHO 
CH, CH, CH, CH, 
I I I 
HO0C-CH-CH,-CH,-CH,-CH-CH,-CH,-CH,-CH,-CH-CH,-CH,-CH,-CH-CO0H 
Perhydrocrocetin 
! Über ein synthetisches Dibixan: Karrer, Stoll, Stevens: Helvet. chim. 
Acta 14, 1194 (1931). — ? Karrer, Benz: Helvet. chim. Acta 16, 337 (1933). — 
3 Raudnitz, Peschel: Ber. dtsch. chem. Ges. 66, 901 (1933). 
  
SR AN el 2
	        
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