1-0-Glucosyl ester

Analogously prepared are the / -D-glucosyl ester of 8 -apo-/ -carotene-8 -oic acid (as imidazolide and triazolide, obtained in 81 and 66% yield, respectively) and vitamin A acid (as triazolide, obtained in 87% yield) tl95]... 

The ratio of the a- to the j -anomeric D-glucosyl ester can be influenced by changing the reaction conditions. In DMF the a-anomer of the crocetin bis(D-glucosyl ester) was formed in about 70% yield.[196] Esterification of D-glucose with the imidazolides of benzoic acid or stearic acid in pyridine furnished a mixture of the a- and j -anomers of the C(l) glucosyl ester.[196]... 

C-Glucosidation. Reaction of the protected a-D-glucopyranosyl chloride 1 with silyl enol ethers activated with AgOTf results in a-C-glucosyl esters or ketones. 

Croce tin-di-(fl-D-glucosyl)-ester Flfr(2). Artificial pathway of croc in... 

Among the compounds that have been isolated from the brassins were a new group of glucosyl esters of fatty acids, the structures of which were established by spectral methods (254, 255) as well as by chemical and biochemical synthesis (256, 257, 258). Although these esters were much less active than brassinolide in the bean second internode bioassay, their presence may be essential for seed germination since the enzymatic synthesis of these esters was correlated to germination (257, 258). 

GA glucosides and glucosyl esters Pharbitis nil Cytisus scoparius Phaseolus vulgaris METMS direct probe MS (14)... 

ABA is extracted from plants and other sources usually by methanol. Methanolysis of glucosyl ester of ABA sometimes occurs to give its methyl ester as an artifact,570 and acetone is used for extraction to avoid the methanolysis. The methyl ester of ABA is not always an artifact. Its occurrence in stigma of tobacco has been confirmed by extraction using acetone.571 Ethyl acetate is used to extract ABA and its natural catabolites,... 

The more than 50 gibberellins (GAs) occur as free 19-carbon or 20-carbon diterpenoid mono-, di-, or tri-carboxylic acids and as the glucosides and glucosyl esters. See Jones and MacMillan (11) for a recent discussion. 

Apocarotenoids. A new C30 diapocarotenoid has been isolated from the bacterium Pseudomonas rhodos and identified by m.s. and H n.m.r. as 4,4 -diapocarotene-4,4 -dioic acid (13). It occurs as mono- and di-glucosyl esters, and with the glucose residues esterified with fatty acids. °... 

In all studies thus far made on starch synthetase, the incorporation of D-glucose from a D-glucosyl ester of a nucleotide into an acceptor molecule has been made by using a radioactively labeled D-glucosyl group in the nucleotide ester, and so the results are unambiguous. However, the extent of the incorporation of D-glucose into the acceptor was very low in the early experiments, and the view has been expressed that starch synthetase is not the major pathway for metabolism of starch. This conclusion seems very reasonable starch biosynthesis is probably a multi-pathway process. Of interest in this connection is a comparison that has been made of starch synthetase activity in non-waxy and waxy maize and rice. ... 

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