ライフサイエンスコーパス: polyyne

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

2 their conjugated relatives, the polyenes and polyynes.

3 e different from those of either polyenes or polyynes.

4 ation of conjugated ground-state polyenes vs polyynes.

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

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

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

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

9 mperatures than the corresponding unthreaded polyyne axles.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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