N‐Centered Radical Directed Remote C−H Bond Functionalization via Hydrogen Atom Transfer

Abstract

The N‐centered radical directed remote C−H bond functionalization via hydrogen‐atom‐transfer at distant sites has developed as an enormous potential tool for the organic synthetic chemists. Unactivated and remote secondary and tertiary, as well as selected primary C−H bonds, can be utilized for functionalization by following these methodologies. The synthesis of the heterocyclic scaffolds provides them extra attention for the modern days′ developments in this field of unactivated remote C−H bonds functionalizations.

Hot Electrons Modulation of Third Harmonic Generation in Graphene

“…where E ω0 is the incident electric field, m = 2 for SHG and m = 3 for THG, g is a function of the material's refractive index (n) and ω 0 , and χ (m) is the material's nonlinear susceptibility. g and χ (m) depend on material, angle and polarization of the incident light and on m [21][22][23]. E.g., the THG field for a bulk sample for normal incidence and constant incident power is [21][22][23]:…”

“…g and χ (m) depend on material, angle and polarization of the incident light and on m [21][22][23]. E.g., the THG field for a bulk sample for normal incidence and constant incident power is [21][22][23]:…”

“…where d is the material's thickness. The light intensity (I mω0 in units of W/m 2 ) is related to the optical electric field by I mω0 = n mω0 ǫ 0 c|E mω0 | 2 /2 [21][22][23]. Eq.…”

“…To the best of our knowledge, this non-cubic behavior of the THG signal was not reported before in SLG or any other material. Most experiments on SLG and layered materials took the observation of a cubic power law as a proof of THG [23,[63][64][65]. In SLG, this cubic dependence was also used to calculate χ (3) [23,64,65].…”

“…Most experiments on SLG and layered materials took the observation of a cubic power law as a proof of THG [23,[63][64][65]. In SLG, this cubic dependence was also used to calculate χ (3) [23,64,65]. This approach has two limitations: 1) the nonlinear susceptibilities are well defined only in three-dimensional materials, since they involve a polarization per unit volume [51], thus χ (3) should not be used for SLG; 2) a power-law fit of THG in SLG must take into account E F and T e under the specific experimental conditions.…”