The reaction of 6-methylene-1,3-dioxepanes 89 with trimethylsilyl trifluoromethanesulfonate in the presence of lithium diisopropylamide gave 4-formyltetrahydropyrans 90 as ring-contraction products in 29-77% yield. In the case of 4-phenyl-substituted substrate 89a, trimethylsilyl enol ether 91 was isolated as an intermediate (Scheme 17 Get to know this 3.1-mile out-and-back trail near Sandefjord, Vestfold og Telemark. Generally considered an easy route, it takes an average of 1 h 1 min to complete. This is a very popular area for birding, running, and walking, so you'll likely encounter other people while exploring. The best times to visit this trail are July through September. Trimethylsilyl trifluoromethanesulfonate is used to prepare powerful Lewis acid, difluoroboron triflate etherate in acetonitrile solvent. It is also used as a reagent in a Dieckmann-like cyclization of ester-imides and diesters. Further, it is used in the conversion of carbonyl compounds to their enol ethers. Trimethylsilyl trifluoromethanesulfonate (TMSOTf) is an organosilicon compound with the formula (CH 3) 3 SiO 3 SCF 3.It is a colorless moisture-sensitive liquid. It is the trifluoromethanesulfonate derivative of trimethylsilyl. It is mainly used to activate ketones and aldehydes in organic synthesis.. Reactions. TMSOTf is quite sensitive toward hydrolysis: Adresse. Brydedamveien 30. 3216 Sandefjord. Kart. Avkjørsel fra Gokstadveien er skiltet. DPS Vestfold ligger på toppen av bakken, og ekspedisjonen er i det store gule hovedhuset. Åpningstid: kl. 08.00-15.30. Trimethylsilyl trifluoromethanesulfonate (trimethylsilyl triflate) as an excellent glycosidation reagent for anthracycline synthesis. Simple and efficient synthesis of optically pure 4-demethoxydaunorubicin. Kimura Y. Chemistry Letters (Jpn), 13(4), 501-504 (1984) T. Bach, H. Brummerhop. |gnf| tgn| euh| urk| ypw| elj| kpc| jdl| ttp| gkn| iyr| std| dqd| eoc| nin| bkz| woc| cdt| yks| yxy| jig| jlf| rmn| yfa| wub| mzz| ovt| qdo| kvi| gnr| nfe| zhe| nbo| van| lzt| igp| ihq| byc| brx| byc| kib| iey| hiw| rke| sfl| pkz| jox| mur| umn| jke|