Go to our The Waste Framework Directive aims to protect the environment and human health from the generation and management of waste and to improve efficient use of resources. 0000025702 00000 n 0000008913 00000 n 0000016495 00000 n
It is comprised of the following lists: The complete list of EC-inventory is too large to be displayed on this page. 1 publications. 0000021551 00000 n It covers their hazardous properties, classification and labelling, and information on how to use them safely. 0000007095 00000 n The benzylidene diacetate, (5-25 wt.%) should desirably be reacted in a solvent such as benzene. 0000004948 00000 n 0000004213 00000 n Peterson olefination of 348, followed by hydrolysis of the benzylidene group gave diol 349. A process for producing pure dimethyl ether. The Prior Informed Consent Regulation administers the import and export of certain hazardous chemicals and places obligations on companies who wish to export these chemicals to non-EU countries. 0000003393 00000 n ECHA organises consultations to get feedback from all interested parties and to gather the widest possible range of scientific information for the regulatory processes. 0000009102 00000 n
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0000016109 00000 n Please note: The files provided below are text files formatted according to IT standards. However, discrimination among reactive sites of the same class of benzyl-type protecting group is required for the synthesis of complex natural products.
In the case of 4,6-O-benzylidene glycosides, we previously found that the stereochemistry at 4-position altered the reaction rate constant for hydrolysis of benzylidene acetal group. The half-lives for the base-catalyzed hydrolysis of ethylene glycol diacetate have been estimated to be 15 days at pH of 8 and 152 days at a pH of 7(7,SRC). 0000007447 00000 n XML is a markup language for documents containing structured information. 0000017278 00000 n 0000012097 00000 n Please accept Terms and Conditions which apply on using this service.
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REACH regulation aims to improve the protection of human health and the environment from the risks that can be posed by chemicals. 0000003283 00000 n
The benzylidene acetal group is one of the most important protecting groups not only in carbohydrate chemistry but also in general organic chemistry. Benzylidene diacetate may be converted to phenyl acetate and methylene diacetate by an acid-catalyzed reaction in the presence of oxygen or air, and acetic anhydride, at elevated temperatures and pressures. %PDF-1.4 %���� trailer << /Size 367 /Info 233 0 R /Root 237 0 R /Prev 173453 /ID[<189167bcea2ecd61f44d21411abf61ed>] >> startxref 0 %%EOF 237 0 obj << /Type /Catalog /Pages 235 0 R /Metadata 234 0 R /Outlines 243 0 R /Threads 238 0 R /Names 241 0 R /OpenAction [ 242 0 R /FitH 803 ] /PageMode /UseOutlines /PageLabels 232 0 R >> endobj 238 0 obj [ 239 0 R 240 0 R ] endobj 239 0 obj << /I << /Title (maintxt)>> /F 272 0 R >> endobj 240 0 obj << /I << /Title (LOGOS_REPRINT)>> /F 309 0 R >> endobj 241 0 obj << /Dests 230 0 R >> endobj 365 0 obj << /S 526 /T 815 /O 869 /E 885 /L 901 /Filter /FlateDecode /Length 366 0 R >> stream This article is cited by Please reconnect.
Owner name: Welcome to the ECHA website. The benzylidene acetal group is one of the most important protecting groups not only in carbohydrate chemistry but also in general organic chemistry. 0000015553 00000 n or in a thesis or dissertation provided that the correct acknowledgement is given 0000007679 00000 n The process of this invention is conveniently carried out under elevated temperatures of from about 150Â° to 250Â° C., preferably 200Â° to 220Â° C., and initial pressures at room temperature, of from about 100 to 300 psig, of an O2 -containing gas, preferably 190 to 220 psig, in an autoclave for periods ranging from about 15 minutes to 4 hours, depending upon the pressures and temperatures employed. 0000016303 00000 n 0000008343 00000 n A hydroxyl group-directed, highly regio- and stereoselective transposition of allylic alcohols based on rhenium catalysis is suitable for a direct isomerization of acetals into the thermodynamically preferred isomer as long as one of the hydroxyl … CAS no. 0000004596 00000 n 0000011683 00000 n The phenyl acetate and methylene diacetate may be recovered and separated by routine methods, as for example by distillation. In this work, the hydrolysis reaction … 0000008151 00000 n Find more information on the Altmetric Attention Score and how the score is calculated. 0000011779 00000 n You’ve supercharged your research process with ACS and Mendeley! Electronic Supporting Information files are available without a subscription to ACS Web Editions.
0000048981 00000 n Kinetics of oxazirane formation from benzylidene-tert-butylamines and perbenzoic acid, Catalytic preparation of ketones from aldehydes. 0000012860 00000 n Following hydrolysis of FDA, ﬂuorescein is released and can be measured spectrophotometrically. Please note that it may take a week or two to have everything fully in place, and please be aware in the meantime that the Registration status may be incorrect and the CLP regulatory context may be incompletely shown.
You can download the list as comma-separated file (CSV format), XML (encoded with UTF-8) or in XLSX file format and read it with other software like the common spreadsheet or word processing softwares. 0000006421 00000 n 0000019432 00000 n the whole article in a third party publication with the exception of reproduction II, Preparation of cyclohexane-1,3-dione and of alkyl-substituted derivatives thereof, Peracid oxidation of imines. 0000006873 00000 n Primesep. organic … ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUN TECH, INC.;REEL/FRAME:004435/0390. Fetching data from CrossRef. 0000010626 00000 n The amount of acid catalyst employed should be in concentrations ranging from about 10-1 to 10-2, preferably 2Ã10-2 to 4Ã10-2, moles/liter. XLSX is file type used by Microsoft Excel. One method for preparing the benzylidene diacetate starting material is by the acid catalyzed reaction of benzaldehyde with acetic anhydride disclosed in J.A.C.S., 72, 847 (1950). A process for the production of phenyl acetate and methylene diacetate which comprises reacting benzylidene diacetate with air or oxygen at elevated temperatures and pressures in the presence of acetic anhydride and an acid catalyst. 0000009196 00000 n Find more information about Crossref citation counts. ASSIGNMENT OF ASSIGNORS INTEREST. Characterization of uptake and hydrolysis of fluorescein diacetate and carboxyfluorescein diacetate by intracellular esterases in Saccharomyces cerevisiae, which result in accumulation of fluorescent product. If desired, small amounts of initiators such as azobisisobutyronitrile, dibenzoylperoxide and the like may be added to help initiate the reaction. 0000018335 00000 n All parameters obtained suggested that the rate constant for hydrolysis reaction was regulated by protonation and hydration steps along with solvation. Ethylene glycol diacetate is expected to biodegrade in water based on Hach respirometric and OECD Screening (die-away) tests using sewage inocula(8). potential. 0000010149 00000 n 0000022537 00000 n This site is not fully supported in Internet Explorer 7 (and earlier versions). 0000022805 00000 n Fluorescein diacetate (FDA) hydrolysis assays can be used to measure the enzyme activity of microbes in a sample. The XML file provides the full list of Pre-registered substances. 6. Mol. 0000011491 00000 n 0000026590 00000 n The process of claim 1 wherein the initial pressure, at room temperature, is from about 100 to 300 psig. More particularly, this invention relates to the conversion of benzylidene diacetate to phenyl acetate and methylene diacetate by an acid catalyzed reaction in the presence of acetic anhydride and air or oxygen at elevated temperatures. The product, methyl 2- O -benzyl-4,6- O -benzylidene- α - d -glucose was oxidized under the Swern conditions to afford ketone 348. Packaging 5, 10, 25, 100 g in glass bottle Please be aware there may be intermittent unavailability while work in ongoing. Benzylidene diacetate . Benzylidene acetals are frequently used as 1,2- and 1,3-diol protecting groups. 0000011008 00000 n Application Fluorescein diacetate has been used for the differentiation of live cells from dead cells. If you are the author of this article you do not need to formally request permission The following examples are provided to illustrate, but not to limit, the scope of the invention described herein.
Welcome to the ECHA website. 0000004191 00000 n A bright yellow-green glow is produced and is strongest when enzymatic activity is greatest. 3. to reproduce figures, diagrams etc. 0000007563 00000 n In the case of 4,6-O-benzylidene glycosides, we previously found that the stereochemistry at 4-position altered the reaction rate constant for hydrolysis of benzylidene acetal group. Following hydrolysis of FDA, ﬂuorescein is released and can be measured spectrophotometrically.
The rates of hydrolysis were found to depend on the Hammett acidity function , and plots of log + against log had negative slopes. XX is the XXth reference in the list of references. 0000009007 00000 n 0000010437 00000 n The entropies of activation obtained are consistent with the formation of a cyclic transition state, in which a protonated acetoxy-group acts as a Lewis acid in assisting the loss of the second-acetoxy-group. The reaction of cyclohexylphenyl ketone with perbenzoic acid.
The acid-catalysed hydrolyses of a series of benzylidene diacetates have been studied. 0000020453 00000 n
;ASSIGNOR:SUN TECH, INC.;REEL/FRAME:004435/0414, ASSIGNMENT OF ASSIGNORS INTEREST. Fields that may contain a special character (semicolon, newline, or double quote), are enclosed in double quotes. 0000002972 00000 n
0000010053 00000 n The acid-catalysed hydrolyses of a series of benzylidene diacetates have been studied. If you are the author of this article you still need to obtain permission to reproduce Studies for Elucidation of Oligosaccharide Functions of Glycoproteins. The Arrhenius and Eyring plot indicated that the pre-exponential factor (A) and ΔS⧧ were critical for the smallest reaction rate constant of Gal among nonacetylated substrates.
For permission to reproduce, republish and 0000022559 00000 n 045M. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUN TECH, INC.;REEL/FRAME:004435/0414, Free format text: 0000011587 00000 n 0000006238 00000 n Carbohydrate Research, 45 (1975) 3-9 X3 Elsevier Scientific Publishing Company, Amsterdam - Printed in Belgium SOME BENZYLIDENE ACETAL DERIVATIVES OF THEOPHYLLINE NUCLEOSIDES t ALAN J. FREESTONE*, LESLIE HOUGH**, AND ANTrHONY C. RICHARDSON Departmnent of Clhemistry, Queen Elizabeth College, Canzpden Hill Road, London W8 7AH (Great Britain) (Received … 0000006122 00000 n article provided that the correct acknowledgement is given with the reproduced material. 0000011298 00000 n It contains for each substance its EC number, CAS number (when available), name, synonyms (when available), related substances and registration date. 0000017035 00000 n it in a third party non-RSC publication you must 2. Occupational exposure limit (OEL) values are derived within two legal frameworks that form an integral part of the EU’s mechanism for protecting the health of workers. 0000025724 00000 n
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