ライフサイエンスコーパス: hyperconjugative

1 Electrostatic interactions, rather than a hyperconjugative anomeric effect, appear to be responsib

2 reactivities result from differences in the hyperconjugative aromaticities and antiaromaticities of

3 mplements an earlier inference of "positive" hyperconjugative aromaticity for the cyclohexadienyl cat

4 The present work investigated whether hyperconjugative assistance and H-bonding can be combine

5 h 1,4- and 1,5-isomers can be stabilized via hyperconjugative assistance for the C...N bond formation

6 When the hyperconjugative assistance is maximized by the antiperi

7 both 1,4- and 1,5-isomers is facilitated via hyperconjugative assistance to alkyne bending and C...N

8 Optimization of hyperconjugative assistance, provided by the antiperipla

9 re constrained close to proper alignment for hyperconjugative assistance.

10 ys, ranging from aromatic stabilization to a hyperconjugative beta-Si effect.

11 ombination of C-H anion hydrogen bonding and hyperconjugative charge delocalization explains the sens

12 Calculated pairwise-steric and hyperconjugative-delocalization energies provide a means

13 ned result of the steric effect H-8a and the hyperconjugative effect of the *C-O to the incoming 1,3-

14 al allyl ethers and emphasizes a stabilizing hyperconjugative effect, which we have termed a transiti

15 lar, polarizability, solvation, and negative hyperconjugative effects are all of some importance in p

16 ay structure analysis provides evidence that hyperconjugative effects are responsible for a change in

17 terest in the anomeric effect, anomeric-like hyperconjugative effects have been thoroughly investigat

18 ne should bear in mind that the magnitude of hyperconjugative effects is extremely sensitive to small

19 this case, can be rationalized by steric and hyperconjugative effects.

20 The polarity reversal and hyperconjugative influences have received little or no a

21 In general, the strength of the hyperconjugative interaction between the occupied sigma(

22 This effect was explained by a stabilizing hyperconjugative interaction between the sigma* orbitals

23 evel led to a conformation consistent with a hyperconjugative interaction between the vacant p-orbita

24 , as the electron donor orbital in the above hyperconjugative interaction does not exist.

25 d lengthening" due to n(Y)-->sigma(H[bond]X) hyperconjugative interaction is balanced by "X[bond]H bo

26 When the hyperconjugative interaction is weak and the X-hybrid or

27 tionalization of this phenomenon by negative hyperconjugative interaction of the trityl group with th

28 ration as the C-CH(3) group is involved in a hyperconjugative interaction with the empty p orbital an

29 (S) orbitals and energy of the corresponding hyperconjugative interaction.

30 These hyperconjugative interactions are manifested as a strong

31 The results provide strong evidence that hyperconjugative interactions are not responsible for th

32 esults show that although there are stronger hyperconjugative interactions in the staggered anti and

33 istent with favorable sigmaC-H --> sigma*C-O hyperconjugative interactions increasing with greater or

34 The balance of hyperconjugative interactions involving C-H(ax) and C-H(

35 a-acceptors into the optimal arrangement for hyperconjugative interactions may alleviate a portion of

36 C-C bonds can be overshadowed by cooperative hyperconjugative interactions with participation of remo

37 F) --> sigma*(C-Y)gem, where Y = H, C, O, S, hyperconjugative interactions; that is, contrary to comm

38 oyed the BLW method to probe the electronic (hyperconjugative) interactions.

39 otope effects in 2-propanol strongly imply a hyperconjugative mechanism for the isotope effects at H1

40 ic assistance to the C-C bond cleavage via a hyperconjugative n(N) --> sigma*(C-C) interaction.

41 ls which are essential to make operative the hyperconjugative nature of these effects.

42 romaticity to weak intra- and intermolecular hyperconjugative phenomena.

43 r "analog", the physical picture of enhanced hyperconjugative (resonance-type) delocalization in Si-O

44 More generally, the hyperconjugative ring current in a family of C(2v) plana

45 Hyperconjugative sigma to sigma delocalization interacti

46 the transition state, it is argued that both hyperconjugative stabilization and inductive effects of

47 on appears to be largely offset by a loss of hyperconjugative stabilization from the adjacent C-H bon

48 a three-membered ring, the magnitude of the hyperconjugative stabilization in all other substituted

49 m is relatively shallow and that the current hyperconjugative stabilization model is inconsistent wit

50 static effects, this analysis indicates that hyperconjugative stabilization through sigmaCC -->sigma*

51 Hyperconjugative, steric, and electrostatic effects were

52 with concomitant differences in n --> sigma* hyperconjugative transfer from O2 to CH2.

53 otope effect at H1 is due to n(p) --> sigma* hyperconjugative transfer from O5 to the axial C1--H1 bo