1983
DOI: 10.1002/cber.19831160330
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Carbonsäure‐trifluormethansulfonsäure‐ und ‐methansultonsäure‐anhydride, Darstellung und Dissoziationstendenz

Abstract: Carbonsaure-trifluormethansulfonsaure-anhydride 3 und -methansulfonsaure-anhydride 7 sind aus den entsprechenden Carbonsaurechloriden 1 rnit Silber-trifluormethansulfonat (2) bzw. Silber-methansulfonat (6) in guten Ausbeuten zuganglich; die Anhydride 3 konnen auch aus den Chloriden 1 rnit Trifluormethansulfonsaure (4) hergestellt werden. Die schon in 1,2-Dichlorethan zu beobachtende Dissoziation der Anhydride 3 in Abhangigkeit von elektronischen und sterischen Faktoren wurde quantitativ bestimmt. Die Dissoziat… Show more

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Cited by 21 publications
(15 citation statements)
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“…13 C NMR analysis of 3 a shows a diagnostic carbonyl signal for an aroyl triflate ( δ =155.5 ppm), while 19 F NMR reveals the presence of the triflate ( δ =−77.5 ppm). All other data are consistent with previously reported 3 a …”
Section: Figuresupporting
confidence: 93%
“…13 C NMR analysis of 3 a shows a diagnostic carbonyl signal for an aroyl triflate ( δ =155.5 ppm), while 19 F NMR reveals the presence of the triflate ( δ =−77.5 ppm). All other data are consistent with previously reported 3 a …”
Section: Figuresupporting
confidence: 93%
“…Selective opening of the tetrahydrofuran ring following the [ 43] method employed by Ganem et al [44] with iron(iii) chloride and acetic anhydride gave the diacetate 21. Regiodifferentiation was achieved by treatment of 19 with acetyl chloride/ silver triflate, according the method used by Effenberger et al, [45] to give the triflate 22. Treatment of 22 with benzylamineÐevidently by the substitution of the triflate moiety, intramolecular aminolysis, and deacetylationÐled to the cisfused 4-hydroxy-decahydroisoquinolin-3-one 23.…”
Section: Studies With the Deuterated Substrates: Kinetic Resolutionmentioning
confidence: 99%
“…Chromatographic purification (silica gel, Et 2 O/hexanes 1:3, then 1:1) afforded 21 (202 mg; 59 %) as a slightly yellow oil. IR (film): n Ä 1740 ± 1715 cm (22): According to the method described by Effenberger et al, [45] the mixed acetic acid (trifluormethanesulfonic acid) anhydride was generated from silver trifluoromethanesulfonate (912 mg, 3.6 mmol) and acetyl chloride (283 mg, 3.6 mmol) in dry dichloromethane (10 mL) at À 78 8C. The mixture was stirred for 17.5 h at this temperature, then a solution of 19 (420 mg, 2.3 mmol) in dry dichloromethane (8 mL) was added.…”
mentioning
confidence: 99%
“…Trifluoromethanesulfonic acid was also reported to activate carbamates and generate the required reactive isocyanate cations, allowing the introduction of the amide functionality into aromatic compounds, a process that can also be used from nitroaryl ureas . In this context, our attention was turned to the thirty‐years‐ago reported reaction of carbonyl chloride with silver trifluoromethanesulfonate, delivering an active carboxylic trifluoromethanesulfonic anhydride at –30 °C (Scheme ) . In addition, the solvolysis of carbamoyl chloride was recently shown to occur at the carbonyl carbon, with replacement of the chloride ion .…”
Section: Introductionmentioning
confidence: 99%