Endometriosis Online Communities: How Machine Learning Can Help Physicians Understand What Patients Are Discussing Online.

Study Objective: Use machine learning to characterize the content of endometriosis online community posts and comments.

Design: Retrospective Descriptive Study.

Setting: Endometriosis online health communities (OHCs) on the platform Reddit.

Ultrafast UV pump/IR probe studies of C-H activation in linear, cyclic, and aryl hydrocarbons.

The photochemical C-H activation reactions of eta(3)-TpRh(CO)(2) (Tp = HB-Pz(3), Pz = 3,5-dimethylpyrazolyl) and CpRh(CO)(2) (Cp = C(5)H(5)) have been studied in a series of linear, cyclic, and aromatic hydrocarbon solvents on a femtosecond to microsecond time scale. These results have revealed that the structure of the hydrocarbon substrate affects the final C-H bond activation step, which is in accordance with the known preference of bond activation toward primary C-H sites. In the case of aromatic C-H activation, the reaction is divided into parallel channels involving sigma- and pi-solvated intermediates.