ライフサイエンスコーパス: dioxirane

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1 roxide molecules such as three-membered ring dioxiranes.

2 contribute to the rates of C-H oxidation by dioxiranes.

3 3,3'-dimethyl-3,3'-bidioxirane, 3B] and mono-dioxirane [1-(3-methyl-dioxiran-3-yl)ethanone, 3A)].

4 products: carbonyl oxide 10, ketone 11, and dioxirane 12.

5 ncy in the chemoselectivity displayed by the dioxirane 1b.

6 ctive oxidation using methyl(trifluoromethyl)dioxirane (1b) under mild conditions.

7 reactive dioxirane, methyl (trifluoromethyl)dioxirane (3), has an estimated SE just 1 kcal/mol great

8 text] Biacetyl reacts with oxone to give bis-dioxirane [3,3'-dimethyl-3,3'-bidioxirane, 3B] and mono-

9 s are incorporated into biacetyl, while mono-dioxirane 3A incorporated only one.

10 Bis-dioxirane 3B is formed when two oxygens are incorporated

11 Si, Ge, and Sn) that serve as precursors for dioxiranes, an important class of oxidants for the synth

12 ring reference compounds by dimerization of dioxirane and or its combination with cyclopropane.

13 esponding C-H functionalization reactions by dioxiranes and nonheme metal-oxo species indicating that

14 bility of a variety of heteroatom-containing dioxiranes and the tools used to characterize unstable p

15 quent rearrangement of the endoperoxide to a dioxirane, and decomposition of the dioxirane to the two

16 is more favorable than isomerization to form dioxirane (by 1.1-3.3 kcal mol(-1)).

17 rein not only reveal the potential of chiral dioxirane catalyzed asymmetric epoxidation as a viable e

18 urately model enantioselectivity for various dioxirane-catalyzed asymmetric epoxidations.

19 The strain energies (SE) for dioxirane (DO) dimethyldioxirane (DMDO) and related diox

20 The SE of the parent dioxirane (DO) has been estimated relative to six-member

21 The SE of dioxirane (DO) is estimated to be approximately 18 kcal/

22 f trisubstituted cyclic olefins via a chiral dioxirane generated in situ from a fructose-derived keto

23 ne (DO) dimethyldioxirane (DMDO) and related dioxiranes have been examined by several methods using h

24 intermediate, identified as cyclohexylidene dioxirane, in equilibrium with the ketone, followed by f

25 molecules rationalized the formation of the dioxirane intermediate via addition of the hydroperoxide

26 ric epoxidation of alkenes with Oxone, via a dioxirane intermediate.

27 etic resonance to obtain direct evidence for dioxirane intermediates.

28 the flavin C4a-hydroxide to an intermediate dioxirane is consistent with the enigmatic aldehydic iso

29 sotope effect and that the intermediacy of a dioxirane is energetically plausible.

30 However, dioxirane may account for the formation of the bis-hydro

31 4g was converted to the 1,4-ene-diol 5g via dioxirane-mediated oxidative desilylation with allylic t

32 The most reactive dioxirane, methyl (trifluoromethyl)dioxirane (3), has an

33 t alkanes typically inaccessible to peracid, dioxirane, ozone, and singlet molecular oxygen chemistry

34 The oxidation of sclareolide with dioxirane reagents is reported, including the oxidation

35 e oxygen molecule, which strongly supports a dioxirane structure for the precursor of the two observe

36 Methyl(trifluoromethyl)dioxirane (TFDO) exhibits much lower calculated activati

37 tive SEs of DO, DMDO, methyl(trifluoromethyl)dioxirane (TFDO), and difluorodioxirane (DFDO) have been

38 ion by the in situ generated tBu-TFDO, a new dioxirane that better discriminates between C-H bonds on

39 malononitrile species, which can cyclize to dioxiranes that can monooxygenate malononitrile alpha-ca

40 edicted to be favored over hydrolysis of the dioxirane, the latter in competition with ring opening t

41 ollowed by cycloetherification with dimethyl dioxirane to give a 4,6-disubstituted tetrahydrodibenzof

42 ide to a dioxirane, and decomposition of the dioxirane to the two observed intermediates.

43 olution of 1,4-cyclohexadienes by the chiral dioxirane was also found to be feasible.

44 O) have been estimated by combination of the dioxirane with cyclopropane to form the corresponding 1,

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