ライフサイエンスコーパス: phosphorane

1 ally more stable POC-isomer of the cage-like phosphorane.

2 th nucleophilic attack to generate a similar phosphorane.

3 ding hydroperoxy arylphosphine and a hydroxy phosphorane.

4 .3(2) with (tert-butylimino)tris(pyrrolidino)phosphorane (12), and the rate constant for H(+) transfe

5 from phenylthioacetal 24 and condensed with phosphorane 30, representing subunit B, in a Wittig reac

6 mally and hydrolytically stable arsanylidine-phosphorane 4 with a sterically accessible two-coordinat

7 pectrum for pentacoordinate chlorooxyanionic phosphoranes 9.

8 The preparation of a ketone from a phosphorane and a nitrile is described.

9 ophilicty of hydroxyl and methoxy ligands in phosphoranes are characterized.

10 The identification of (diglycosyloxy)phosphoranes as reactive species enabled the development

11 ents are in accord with an initial attack of phosphorane at the oxirane ring of epichlorohydrin.

12 The calculations support a phosphorane-based mechanism for the reductions of phosph

13 Phosphorane-based mechanisms that were previously propos

14 a-PGM, and Mg(2+)-beta-glucose-6-phosphate-1-phosphorane-beta-PGM complexes to identify conformationa

15 e pincer ligand to produce a phosphanylidene phosphorane complex [(PNPP)NbCl(N(t) BuAr)] (2).

16 Specifically, phosphorane-derived phenyliodonium tosylates can react w

17 re the transition state, which would promote phosphorane development.

18 The transient phosphorane formed as a result of this nucleophilic atta

19 structure reveals a stabilized pentacovalent phosphorane formed in the phosphoryl transfer from the C

20 A Wittig reaction of the phosphorane from 35 with aldehyde 33, obtained from aldo

21 hin a hypervalent, pentacarbon-ligated sigma-phosphorane furnishes the dibenzothio- or dibenzoselenop

22 rane (H(2)C=PPh(3)) and ethylidene-triphenyl-phosphorane (HMeC=PPh(3)), proceed as expected, giving r

23 also support the formation of a meta-stable phosphorane intermediate along the reaction, which resem

24 tively accommodate water, phosphate, and the phosphorane intermediate during catalytic turnover.

25 ay proceeds in two steps via a pentacovalent phosphorane intermediate in the absence of substrate lig

26 we find a stable pentacoordinated dianionic phosphorane intermediate in the reaction path supporting

27 e scissile phosphate occurs to stabilize the phosphorane intermediate in the sequential mechanism.

28 er 13.22 kcal/mol) the PO bond on the cyclic phosphorane intermediate is nearly broken (BO 0.28) and

29 rsistence of the short-lived five-coordinate phosphorane intermediate on the minutes times scale is r

30 iate along the reaction, which resembles the phosphorane intermediate structure obtained only in the

31 associative with a metastable pentacovalent phosphorane intermediate, and the pyrophosphate leaving

32 observed to be sequential, passing through a phosphorane intermediate, with free energy barriers of 2

33 the formation of a metastable pentacovalent phosphorane intermediate.

34 oton transfer to the phosphate to generate a phosphorane intermediate.

35 L-DOPP bifunctional process probably forms a phosphorane intermediate.

36 e oxides are shown to react via conventional phosphorane intermediates, but phosphine sulfides follow

37 ted to pseudorotamer preferences in putative phosphorane intermediates.

38 mechanism is observed to be concerted with a phosphorane-like transition state and a free energy barr

39 alate and perfluorophosphorylated conjugated phosphoranes, obtained by reaction of phosphazenes and f

40 ite (1) when R = Ph and to a hexacoordinated phosphorane-phosphatrane (2) when R = Et.

41 The pentacoordinate phosphorane products (1.[H][NHR]) are structurally robus

42 2a with ethoxycarbonyl- or dibromomethylene phosphorane reagents gave the conjugated dienes 6a and 4

43 hosphates, acyclic and cyclic phosphates and phosphoranes relevant to RNA catalysis are presented.

44 lative strengths of axial and equatorial P-O phosphorane single bonds and P-O single and double bonds

45 of thermally generated arynes reacting with phosphoranes to form helical dibenzothiophenes and -sele

46 ecular dynamics simulations using an anionic phosphorane transition state mimic suggest that H-bondin

47 for an essentially undisturbed pentacovalent phosphorane transition state, and explaining the bypass

48 ion of the developing negative charge on the phosphorane transition state.

49 When phosphoranes were used in the reaction, different produc

50 ation of regio- and stereoisomeric cage-like phosphoranes with phosphorus-carbon and phosphorus-oxyge