Hetero-Diels-Alder reactions of (isobenzo)furans.

Hetero-Diels-Alder reactions of furans and isobenzofurans provide convergent redox-neutral access to hetero-oxanorbornene derivatives. These versatile intermediates serve as precursors to a variety of heterocycles, polymers, and complex natural products. Herein we comprehensively review this area of research and speculate on what developments are required to advance the field.

Remote instruction adversely impacts parental mental health, less among homeschoolers.

This study explores the effects of the COVID-19 pandemic-induced shift to remote instruction on parental mental health, using data from the American Enterprise Institute's Return-to-Learn tracker and the U.S. Census Pulse Survey.

Ketenimines as Aza-Dienophiles.

-Aryl ketenimines have been established as highly reactive aza-dienophiles. Intermolecular cycloadditions are achieved upon heating in the presence of 2,5-bis(silyloxy)furans and proceed with high levels of peri-, regio-, chemo- and diastereo-selectivity. Spontaneous C-O cleavage yields oxygenated pyridone derivatives in a highly convergent and redox-neutral manner.

Assessing Obstetrics and Gynecology (OBGYN) Clinicians' Knowledge, Practice, and Attitudes toward Anorexia Nervosa, Atypical Anorexia Nervosa, and Amenorrhea.

Study Objective: Anorexia nervosa (AN) and atypical anorexia nervosa (AAN) are eating disorders (EDs) characterized by extreme restriction of energy intake. However, in contrast to individuals with AN, those with AAN are not underweight. Although individuals with either AN or AAN can experience associated functional hypothalamic amenorrhea (FHA) that may prompt them to seek gynecologic care, little is known about obstetricians' and gynecologists' (OBGYNs') knowledge and approach to these patients; this study sought to fill this gap.

Advances in nonlinear metasurfaces for imaging, quantum, and sensing applications.

Metasurfaces, composed of artificial meta-atoms of subwavelength size, can support strong light-matter interaction based on multipolar resonances and plasmonics, hence offering the great capability of empowering nonlinear generation. Recently, owing to their ability to manipulate the amplitude and phase of the nonlinear emission in the subwavelength scale, metasurfaces have been recognized as ultra-compact, flat optical components for a vast range of applications, including nonlinear imaging, quantum light sources, and ultrasensitive sensing. This review focuses on the recent progress on nonlinear metasurfaces for those applications.