Results 221 to 230 of about 68,150 (262)

Synthesis of emodin methyl ethers

Australian Journal of Chemistry, 1977
Procedures are summarized for the conversion of emodin (1) into all possible mono- and di-methyl ethers. The 1-methyl ether (2) is characterized for the first time. The 1- and 8-methyl ethers are differentiated by small differences in the chemical shifts of appropriate aromatic protons of their respective 6-benzoates.
D. W. Cameron, M. J. Crossley
openaire   +3 more sources

The Methyl Ethers of Hexuronic Acids

1954
Publisher Summary This chapter provides an overview of the methyl ethers of hexuronic acids. Hexuronic acid residues occur in a large number of different polysaccharides. The chapter focuses on the methyl ethers of the naturally occurring D-glucuronic, D-galacturonic, and D-mannuronic acids, and their derivatives.
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Facile transformation of 1-methoxynaphthalenes to octahydrophenanthrenes application to the total synthesis of (±)-sempervirol methyl ether, (±)-sugiol methyl ether, (±)-nimbiol methyl ether, and (±)-nimbidiol dimethyl ether

Tetrahedron Letters, 1994
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Debabrata Mukherjee, Sandip Das, Amit Saha   +2 more
openaire   +3 more sources

Bioactivity of brassinolide methyl ethers

Phytochemistry, 1998
Abstract Four new derivatives of brassinolide (BR) were prepared by single or multiple methylation of the hydroxyl groups at C-2, C-3, C-22 and or C-23 to afford (22 R ,23 R ,24 S )-2 α ,3 α ,23-trihydroxy-22-methoxy-7-oxa-7a-homo-5 α -ergostan-6-one (22-MeBR), (22 R ,23 R ,24 S )-2 α ,3 α ,22-trihydroxy-23-methoxy-7-oxa-7a-homo-5 α -ergostan-6-one ...
Richard P. Pharis, Weide Luo, Loeke Janzen, Thomas G. Back   +3 more
openaire   +2 more sources

The Methyl Ethers of D-Galactose

1955
Publisher Summary This chapter presents a set of tables of the physical characteristics of the methyl ethers of D-galactose and their derivatives, replaces those of D. J. Bell, Advances in Carbohydrate Chem.
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Chloromethyl Methyl Ether

2001
[107-30-2] C2H5ClO (MW 80.51) InChI = 1S/C2H5ClO/c1-4-2-3/h2H2,1H3 InChIKey = XJUZRXYOEPSWMB-UHFFFAOYSA-N (used for the protection of alcohols, phenols, acids, amines, β-keto esters and thiols. A one-carbon synthon for alkylation of aromatics and active methylene derivatives) Alternate Names: methoxymethyl chloride ...
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The Methyl Ethers of D-Galactose

1951
Publisher Summary This chapter discusses methyl ethers of D -galactose. The 2,3,4,6-tetramethyl- D -galactopyranos is obtained by the full methylation of the methyl α- or β- D -galactopyranosides, followed by acid hydrolysis of the products.
openaire   +3 more sources

Proscillaridinmethyläther

Archiv der Pharmazie, 1971
AbstractDurch Methylierung von Proscillaridin unter verschiedenen Reaktionsbedingungen konnten alle theoretisch möglichen Methyläther des Proscillaridins dargestellt und in ihrer Struktur aufgeklärt werden. Die 3′‐ und 4′‐Methyläther lassen sich durch spezifische Methylierung in guten Ausbeuten darstellen.
openaire   +3 more sources

CRYSTALLINE VITAMIN A METHYL ETHER

Journal of the American Chemical Society, 1946
A. R. Hanze, T. W. Conger, E. C. Wise, D. I. Weisblat   +3 more
openaire   +4 more sources

CHLOROMETHYL METHYL ETHER

The Lancet, 1973
openaire   +3 more sources