Back Cover: Catalytic Regio‐ and Enantioselective Protonation for the Synthesis of Chiral Allenes: Synergistic Effect of the Counterion and Water (Angew. Chem. Int. Ed. 27/2022)

Abstract

A chiral Lewis acid accelerated asymmetric Pudovik addition/[1,2]‐phospha‐Brook rearrangement is described by Shunxi Dong, Qian Peng, Xiaoming Feng, and co‐workers in their Research Article (e202203650). Control experiments and theoretical calculations revealed that a synergistic effect of the counterion and water was critical for the regio‐ and enantioselective protonation after the [1,2]‐phospha‐Brook rearrangement.

A boost of thermoelectric generation performance for polycrystalline InTe by texture modulation

“…Fig. 3f shows that the S-n H dependence fits well the SPB Pisarenko curves (i.e., S vs. n H ) with the density-of-states effective mass (m* DOS ) of 0.88 m e during the temperature range of 300-600 K, which is close to those of coarse grain-In 0.99 Ga 0.01 Te, 13 In 0.999 Pb 0.001 Te, 20 In 0.997 Te ingot, 14 and crystal. 17 Thus, the increase of the grain size not only suppresses the GBS to elevate the electrical conductivity but also has little effect on the m* DOS .…”

“…4 Since S, s, and k e are strongly coupled with each other through carrier concentration, it is extremely difficult to improve the electronic performance and final zT value, although band engineering of degeneracy, 5,6 curvature, 7 and valley anisotropy have been intensely adopted. 8 On the other hand, the independent modulation of k L can be utilized to increase the thermoelectric performance, thus promoting a rapid development of materials with intrinsically low k L governed by ''phonon liquid electron crystal'' (PLEC) and strong anharmonic chemical bonds, such as Cu 2 Se, 9 SnSe, 10 Mg 3 Sb 2 , 11 AgSbTe 2 , 12 InTe, 13,14 etc.…”

Na2Ba[Na2Sn2S7]: Structural Tolerance Factor‐Guided NLO Performance Improvement

“…According to our “electronic structure engineer bucket effect theory”, [27] E g of the complex title compound is determined by the “shortest board” of the component that contributes mainly to E F and carries the smallest binary E g . As the E g values of the constituent binary compounds vary in the sequence Ag 2 S (1.06 eV) [28] <Cu 2 S (1.47 eV) [29] <SnS 2 (2.2–2.4 eV) [30] <Na 2 S (2.5 eV) [31] <BaS (3.81 eV) [32] <SrS (4.76 eV), [27b] regardless of the addition of Ag 2 S in series 1 or Cu 2 S in series 2 and 3 , the E g will inevitably decrease with respect to the II‐[I 2 ‐IV‐Q 4 ] parent. Therefore, the title compound Na 2 Ba[Na 2 Sn 2 S 7 ] 1 exhibits the widest E g (3.42 eV) among them, approximately 1.4 eV wider than those of 2 and 3 .…”

Re-evaluation of P-Chiral, N-Phosphoryl Sulfonamide Brønsted Acids in the Asymmetric Synthesis of 1,2,3,4-Tetrahydroquinoline-2-carboxylate Esters via Biomimetic Transfer Hydrogenation

“…38 Most recently, the use of this rearrangement has also been reported in the preparation of (difluoromethyl)cycloalkenes, 39 the Passerini-Smiles reaction of -ketophosphonates, 40 and the asymmetric synthesis of enantioenriched axial chiral allenes. 41 All of the above mentioned reactions proceed under basic conditions, and examples of a Lewis acid catalyzed reaction are extremely rare. 42 To our knowledge, the Brønsted acid catalyzed [1,4]-phospha-Brook rearrangements observed in this study, for the conversion of organocatalyst 14b into the phosphonamidate 15, has not been previously reported.…”