Question

1) SHOW WORK STEP By STEP

Recognizing Epimers Using Figure 7-3, identify the epimers of (a) D-allose, (b) D-gulose, and (c) D-ribose at C-2, C-3, and C-4. Answer Epimers differ by the configuration about only one carbon. (a) D-altrose (C-2), D-glucose (C-3), D-gulose (C-4) (b) D-idose (C-2), D-galactose (C-3), D-allose (C-4) (c) D-arabinose (C-2), D-xylose (C-3)

below is Figure 7-3

Answer 1

Epimers are those stereoisomers which differ in its configuration at only one chiral carbon atom
Spimers Epimes are those stereoisomers which wiffers in its configuration of only one théral Narbon atom. I Ili H -04 a) Epimers of D-allose 1) at c-2 Epimers at C-2 differs in configuration at carbon -2 . So, "epimer of p-allose at C-2 ůs D-althose ICHO OCHO D-altrose is differ in Fc -OH HOCH iconfiguration around 6-2 H -OH H --OH fram D-allose. So, -OH HEE -OH D-altoose is a c-2 epimero of D-allose. - CH₂OH CHOH D-allose D-alfrose (C-2 epimer) 2) at C-3 Configuration is different around (-3, so these two are c-3 Ebiniers H-C oH - - OH H-C-OH I. CHO ICHO H-C-OH H-- - (H-C3-OH OHC-H) H-C-OH H-CS-OH - CHOOH . CHOH D-allose 10-Glucose

- 3) at c-4 - CHO ICHO - M-CEOH H-c-OH .. - H-C20H HC-oh H-COH HO-C4 - HD -н- - он н-сб - он - анон с ең,он D-allose D-Gulose Cu-Epimer D-allose and D- Gulose differ by configuration around °C-4 so these two are c-4 Epimers. D-Gulose and D-idose b) Epimers of D-Gulose -1) C2 - Epimers P ICHO CHO (12-0H HOPED differ by configuration 3 H3c -OH H 3c -OH around" c-2. so, these O HOCH HO-4c-H two are c-2 esimers - HC-0H -5° -OH 6C1H, OH (CH, OH - O- Gulose D-idose = 2) C3-Epimers Do Gulose and D-Galaclose "H-C-OH H - C OH differ by configuration -OH 40-C3-HD HO-G - H Ho-C" H around c-3, so, these HSC-0H H C - OH two are c-z epimers. CHOM chiqom D- Gulose B- Galactose - CHO CHO

. : ICHO H H (10 --G-H HC-OH ICH OH 0-(pulose differ from . D-Allose by configuration wawound carbon-ų. So, they are cu epimers. 3) C-4 Epimers CHO -OH H--OH -OH H -OH (112 -OID SC-04 (CH,044 D-qulose D-Allose c) Epimers of D-Ribase 1) Cz-Epimer D-Ribose and o-Arabinose CHO ICHO differ from each other (4 24-0H (Go-c-7 H-S-OH MSC -01 H-"C-OH Huc-OH Carbon-2. so, they SCHOH SCH,04 are (-2 Epimers. D-Ribose D- Arabinose I 2) C3 - Epimer I CHO CHO D-Ribose and H-26-OH : H²C -OH D-Xylose are con -C – OH HOP - HD C-spímers because M-¢- OH H MC -OH - SCH₂OH - SCHOH they differ by D-Ribose D-Xulose configuration versound III ly configuration around D-Ribose O- Xylose C-3,