Infrared excesses around white dwarf stars indicate the presence of various astrophysical objects interest, including companions and debris disks. In this second paper a series, we present follow-up observations infrared excess candidates from Gaia unWISE discussed in first paper, Paper I. We report space-based photometry at 3.6 4.5 micron for 174 dwarfs Spitzer Space Telescope ground-based nea...

High chemical yields and good enantiomeric excesses are obtained by using soluble polymer-supported tartrate ester in the epoxidation of trans-hex-2-en-1-ol using Ti(OPri)4/tert-butyl hydroperoxide.

Abstract The asymmetric Rh‐catalyzed hydrocarboxylation of α,β‐unsaturated carbonyl compounds was originally developed by Mikami and co‐workers but gives only moderate enantiomeric excesses. In order to understand the factors controlling enantioselectivity propose novel ligands for this reaction, we have used computational experimental methods study with different bidentate ligands. analysis C−...

Pizzarello et al. (1) recently described the soluble organic content of eight Antarctic Renazzo-type (CR) carbonaceous chondrites and reported large enantiomeric excesses (ee) of Lisoleucine and D-alloisoleucine. The reported values of ee decrease with inferred increases in aqueous alteration. We believe the conclusions presented in the paper are not fully justified and the data are potentially...

We derive a thermodynamic identity that allows one to infer the change in the number of screening ions that are associated with a charged macromolecule as the macromolecule is continuously stretched. Applying this identity to force-extension data on both single-stranded and double-stranded DNA, we find that the number of polymer-associated ions depends nontrivially on both the bulk salt concent...