METHYL 2-ALPHA,3-BETA,23-TRIACETOXYURS-12,18-DIEN-28-OATE

被引：3

作者：

COX, PJ

DURHAM, DG

LIU, XJ

RICHARDS, RME

机构：

来源：

ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS | 1995年 / 51卷 / pt 10期

关键词：

D O I：

10.1107/S0108270195005774

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The crystal and molecular structure of the novel triterpenoid methyl 2 alpha,3 beta,23-triacetoxyurs- 12,18-dien-28-oate, C37H54O8, has been determined. There are two molecules in the asymmetric unit, each having a long bond due to steric effects and considerable out-of-plane bending at the C12=C13-C18=L19 chromophores.

引用

页码：2135 / 2137

页数：3

共 11 条

[1] SIR92 - a program for automatic solution of crystal structures by direct methods
ALTOMARE, A
CASCARANO, G
GIACOVAZZO, G
GUAGLIARDI, A
BURLA, MC
POLIDORI, G
CAMALLI, M
[J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1994, 27 : 435 - 435
[2] A NITROGEN-GAS-STREAM CRYOSTAT FOR GENERAL X-RAY-DIFFRACTION STUDIES
COSIER, J
GLAZER, AM
[J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1986, 19 (02) : 105 - 107
[3] COX PJ, 1994, J CHEM RES-S, P122
[4] MOLECULAR-STRUCTURES OF 4 TRITERPENOIDS - X-RAY CRYSTALLOGRAPHIC ANALYSIS OF METHYL 2-ALPHA,3-BETA,23-ALPHA-TRIACETOXY-19-ALPHA-HYDROXYURS-12-EN-28-BETA-OATE
COX, PJ
DURHAM, DG
LIU, XJ
RICHARDS, RME
[J]. JOURNAL OF CRYSTALLOGRAPHIC AND SPECTROSCOPIC RESEARCH, 1993, 23 (10): : 779 - 783
[5] COX PJ, 1994, J CHEM RES M, P843
[6] DAVIES K, 1983, SNOOP1 MOL PLOTTING
[7] EDWARDS C, 1995, CRYSTAN 6 3 COMPUTER
[8] ON ENANTIOMORPH-POLARITY ESTIMATION
FLACK, HD
[J]. ACTA CRYSTALLOGRAPHICA SECTION A, 1983, 39 (NOV): : 876 - 881
[9] LIU IX, 1994, THESIS R GORDON U AB
[10] Sheldrick G. M., 1993, SHELXL93 PROGRAM REF

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