摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v66-011

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

A new brominated phenolic compound, isolated in 5% yield from the red algaPolysiphonialanosa, has been characterized as 2,3-dibromobenzyl alcohol 4,5-disulfate, dipotassium salt. The structural determination, synthesis, and properties of this compound and its derivatives are described.

ISSN:0008-4042    

DOI:10.1139/v66-012

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

The tri-O-methanesulfonyl derivatives of methyl β-D-xylopyranoside, methyl β-L-arabinopyranoside, and methyl α-L-arabinopyranoside undergo selective substitution at C-4, when heated with sodium azide inN,N-dimethylformamide, to yield 4-azido derivatives with inversion of configuration at C-4. The resultant 4-azido-2,3-di-O-methanesulfonyl derivatives were converted, by reaction with sodium methoxide, into 2,3-anhydro compounds whose configurations were assigned by nuclear magnetic resonance analysis. The mechanism of epoxide formation is discussed.

ISSN:0008-4042    

DOI:10.1139/v66-013

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

TheChlorobiumchlorophylls (660) consist of six different pigments, all of which are derivatives of δ-alkyl-2-desvinyl-2-α-hydroxyethylpyropheophorbide.α The six compounds differ in their substituents at C4(isobutyl,n-propyl, ethyl), C5(ethyl, methyl), and Cδ(ethyl, methyl).

ISSN:0008-4042    

DOI:10.1139/v66-014

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

1,3,4,6-Tetra-O-acetyl-2-deoxy-2-(dithiocarbomethoxy)-2-amino-β-D-glucopyranose, when it was treated with trifluoroacetic acid, gave 3′,4′,6′-tri-O-acetyl-2-(methylthio)-D-glucopyrano-[2′,1′:4,5]-2-thiazoline (III). Compound III showed a nuclear magnetic resonance spectrum capable of full interpretation. Long-range coupling between H2and H4was observed. The conformation of this compound in solution was discussed on the basis of the coupling constants for ring hydrogens.

ISSN:0008-4042    

DOI:10.1139/v66-015

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v66-016

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v66-017

出版商:NRC Research Press    

年代:1966

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v66-018

出版商:NRC Research Press    

年代:1966

数据来源: NRC