Cyclothiomethylation
Webcyclothiomethylation with CH2O and H2S with the initial reagents in ratios of 1:6:4 leads to the selective formation of 1,5-dithia-3,7-diazacyclooctanes. Web2,4,8-Trialkyl-3-thia-1,5-diazabicyclo[3.2.1]octanes have been obtained by the regioselective and stereoselective cyclocondensation of 1,2-ethanediamine with aldehydes RCHO (R═Me, Et, Prn, Bun, Pentn) and H2S at molar ratio 1:3:2 at 0°C. The increase in molar ratio of thiomethylation mixture RCHO–H2S (6:4) at 40°C resulted in selective formation of bis …
Cyclothiomethylation
Did you know?
Web开馆时间：周一至周日7:00-22:30 周五 7:00-12:00; 我的图书馆 WebNov 19, 2007 · Cyclothiomethylation of 1a, b at 20–40 °C gives a mixture of 2a, b and 3a, b together with 3- (2-methylideneaminoethyl)-1,3-thiazetidines ( 4a, b) ( Scheme 1 ). The latter were observed by GC–MS. Mass spectra of 4a, b contain peaks of molecular ions [M] + with m / z 130 4a and 144 4b.
WebDec 1, 2015 · The review generalizes and systemizes published data on the synthesis of biologically active saturated five-, six-, seven-, and … WebAccording to [1–4], cyclothiomethylation of aliphatic and aromatic primary amines, as well as amides of carboxylic acids [5, 6] with СН2О and Н2S gives rise to the corresponding 1,3,5-dithiazinanes; but with functionally substituted anilines, benzothiaza …
WebThe review generalizes and systemizes published data on the synthesis of biologically active saturated five-, six-, seven-, and eight-membered S,N-heterocycles. Particular attention is given to cyclothiomethylation of various amines by the action of two-component systems CH2O-H2S (or thiols) and RCHO-CS2 (or S2Cl2). WebCyclothiomethylation of the terminal amino groups in N-(2-aminoethyl)ethane-1,2-diamine, N,N′-bis(2-aminoethyl)ethane-1,2-diamine, and N,N′-bis(2-aminoethyl)ethane-1,1 …
WebJan 7, 2012 · ChemInform Abstract: Cyclothiomethylation of Heterochain α,ω‐Diamines with Formaldehyde and H2S. ChemInform Abstract: Cyclothiomethylation of Heterochain α,ω‐Diamines with Formaldehyde and H2S. high school work study program nsaWebCyclothiomethylation of o-phenylenediamine with CH2O and H2S gives rise to 1,2,4,5-tetrahydrobenzo[d][1,3,6]thiadiazepine and 1,2,6,7-tetrahydrobenzo[f][1,3,5,8]dithiadiazonine, whereas m-phenylenediamine forms benzothiaza macroheterocycles of various structure, comprising 4–8 molecules of the starting … high school workbook pdf freeWebFeb 1, 2024 · A method of synthesis of N-carboxyalkyl-substituted dithiaza- and dioxadithiazacycloalkanes was developed consisting in a tricomponent [1+2+1]-cyclocondensation of amino acids with formaldehyde and aliphatic α,ω-dithiols (1,3-propane-, 1,4-butanedithiols, 3,6-dioxa-1,8-octanedithiol). View on Springer Save to Library … high school workbooks with answers pdfWebThe cyclothiomethylation of carboxylic acid hydrazides RCONHNH2 (R = C5H4N, Ph, 2-MeOC6H4, or 4-HOC6H4CH2) with formaldehyde and H2S at 70 C affords … how many crimean wars have there beenWebNov 19, 2007 · Cyclothiomethylation of 1a,b at 20–40 °C gives a mixture of 2a,b and 3a,b together with 3-(2-methylideneaminoethyl)-1,3-thiazetidines (4a,b) (Scheme 1). … how many crimes are committed daily in the ukWebNov 19, 2007 · The cyclothiomethylation of carboxylic acid hydrazides RCONHNH2 (R = C5H4N, Ph, 2-MeOC6H4, or 4-HOC6H4CH2) with formaldehyde and H2S at 70 °C affords predominantly the corresponding… Expand 9 Phenylenediamine and 4,4′-diaminodiphenyls in cyclothiomethylation with CH2O and H2S G. R. Khabibullina, V. R. Akhmetova, R. … how many crickets to feed baby bearded dragonWebCyclothiomethylation of aliphatic polyamines with formaldehyde and hydrogen sulfide how many crimes are committed daily in the us