ライフサイエンスコーパス: polyyne

1 ne, D(9h) polyyne, D(9h) cumulene, and C(9h) polyyne.

2 in the synthesis of new, organic, long chain polyynes.

3 plore gem-dibromoethene moieties as "masked" polyynes.

4 their conjugated relatives, the polyenes and polyynes.

5 e different from those of either polyenes or polyynes.

6 ation of conjugated ground-state polyenes vs polyynes.

7 to the long effective conjugation length of polyynes.

8 1890 inverse centimeters, similar to linear polyynes.

9 This MAE was used to synthesize a polyyne [2]rotaxane and a masked-polyyne [3]rotaxane by

10 ynthesize a polyyne [2]rotaxane and a masked-polyyne [3]rotaxane by Cadiot-Chodkiewicz coupling.

11 we report an active metal template route to polyyne [3]rotaxanes, using dicobalt carbonyl masked alk

12 , CN, Cl, H, OH, NH(2); spacers R = polyene, polyyne, acene with n = 1-5 repeatable units) show that

13 ambient conditions, probably because the two polyynes adopt a crossed geometry.

14 f variably substituted trans-polyacetylenes, polyynes, and polythiophenes.

15 Polyynes are archetypal molecular wires that feature a r

16 Polyynes are chains of sp(1) carbon atoms with alternati

17 The use of amine end-capped polyynes as precursors to substituted push-pull thiophen

18 mperatures than the corresponding unthreaded polyyne axles.

19 ze-exclusion chromatography and labeled with polyyne-based Raman tags targeting three ovarian cancer

20 The stability enhancement increases as the polyyne becomes longer, reaching 60 degrees C in the C24

21 yne (217.5 +/- 0.6 kcal mol(-1)), the larger polyynes C(10)H(2) through C(26)H(2), and an infinite ac

22 most acute distortion at the point where the polyyne chain pushes against the Re(CO)3Cl unit.

23 n the solid state, the angle between the two polyyne chains is 74 degrees , and this crossed geometry

24 s been used to prepare [3]rotaxanes with two polyyne chains locked through the same macrocycle.

25 structural reorganization and cooling of hot polyyne chains, following internal conversion (over appr

26 regime at which the electronic properties of polyynes converge to those of carbyne.

27 Moreover, the polyyne core is a key component to several natural produ

28 It has been anticipated that long polyynes could be stabilized by supramolecular encapsula

29 nd-angle alternation: D(18h) cumulene, D(9h) polyyne, D(9h) cumulene, and C(9h) polyyne.

30 d two [3]rotaxanes, both with the same C(28) polyyne dumbbell component, one with a phenanthroline-ba

31 taxanes were compared with that of the naked polyyne dumbbell in decalin at 80 degrees C, and the nan

32 condary amines led to novel amine end-capped polyynes exhibiting surprisingly high stability toward m

33 iate the formation and control the growth of polyynes have been the least understood to date.

34 sed of alkyne building blocks (oligoynes and polyynes) have provided glimpses of the potential proper

35 ul synthetic reaction for the preparation of polyynes; however, chemoselectivity issues have preclude

36 vestigate the photophysics of a prototypical polyyne (i.e., 1D chain with alternating single and trip

37 Understanding the behavior of polyynes in molecular junctions is essential for testing

38 the ground-state stabilization of conjugated polyynes is in fact quite small, amounting to <1 kcal mo

39 anding of the primary photoinduced events in polyynes is of key importance both for fundamental knowl

40 y single crystal study of pyrrole end-capped polyynes is presented.

41 el also confirms that electronic coupling in polyynes is unaffected by the rotation about the single

42 hermochemistry of straight-chain alkynes and polyynes is very self-consistent.

43 we demonstrate by determining geometries of polyyne molecules-the task difficult for both experiment

44 New strategies for synthesizing polyyne polyrotaxanes are being developed as an approach

45 cycles to form polyrotaxanes-but, until now, polyyne polyrotaxanes with many threaded macrocycles hav

46 lents (MAEs) are needed for the synthesis of polyyne polyrotaxanes, as insulated molecular wires and

47 Polyyne polyrotaxanes, encapsulated cyclocarbon catenane

48 anly enough to prepare extended encapsulated polyyne polyrotaxanes.

49 tramolecular macrocyclization of alpha,omega-polyyne precursors via Cu-mediated or Pd-catalyzed oxida

50 The polyynes, Py**[n] (n = 4, 6, 8, 10, 12, 16), are end-cap

51 ng calorimetry (DSC) reveals that the longer polyyne rotaxanes (C16, C18, and C24) decompose at highe

52 g-Wiechell rearrangement to form the desired polyyne rotaxanes has not yet been achieved.

53 For the last four decades, the role of polyynes such as diacetylene (HCCCCH) and triacetylene (

54 ilding block to synthesize even more complex polyynes such as tetraacetylene (HCCCCCCCCH).

55 It secretes a cyclic lipopeptide and a polyyne that deflagellate, blind, and lyse the algae [P.

56 indane rotaxane results in unmasking of the polyyne thread to form a rotaxane with a chain of 16 sp-

57 st regioselective transformation of a longer polyynes to butadiyne-substituted thiophene.

58 s the most accurate determination of beta in polyynes to date (beta = 2.2 +/- 0.1 nm(-1)).

59 ng, and mutational analysis, we discovered a polyyne toxin, protegencin, which is secreted by P. prot

60 , and modeling study on the synthesis of the polyyne triacetylene (HCCCCCCH) via the bimolecular gas

61 nthesis of unbranched 1,5,9,n-polyenes (and -polyynes) was investigated.

62 ether key C6-building blocks from which the polyynes were constructed.

63 he construction of molecular junctions using polyynes with a well-defined length up to ca. 5 nm in de

64 gated polyenes, conjugative stabilization of polyynes with the -CC-CC- group might be expected to be

65 hesize a series of rotaxanes consisting of a polyyne, with up to 24 contiguous sp-hybridized carbon a